Butterflies of New Mexico: The Whites (Pieridae II: Pierinae)

by Steven J. Cary

Whites (Pieridae: Pierinae). Including the orangetips and marbles, there are 16 species of butterfly Whites (Family Pieridae: Subfamily Pierinae) in New Mexico. Most are of modest size, but some are larger. Some are very infrequent summer strays from farther south. The European Cabbage White is our only non-native butterfly. Larvae of most whites eat mustards (Brassicaceae). After a wet winter in southern New Mexico, four of the group put on quite a show as males quibble over prime, desert hilltop real estate while females shop through the selection of mustards (Brassicaceae) seeking the best oviposition sites for their offspring. Some members of this group withstand drought by staying in pupal diapause, sometime for several years, until winter rains make conditions favorable for larval hosts.


Anthocharis thoosa (Scudder)     Southwestern Orangetip (updated June 30, 2021)

Description. Southwestern Orangetips have are distinguished by bright orange dorsal forewing apical patches with black borders. In females, the black borders are diffuse and the wing ground color is pale yellow. The ventrum of both sexes is marbled with dark green. Range and Habitat. Anthocharis thoosa lives in Nevada, Utah, Colorado, Arizona and New Mexico (all counties but Ch,Co,DB,Ed,Le,Ro,Un). Here, it is widespread in Upper Sonoran and Transition Zone savannas, 4500 to 8500′ elevation. Life History. Mustards (Brassicaceae) are larval hosts. Paul Opler observed oviposition on Arabis sp. in Gallinas Canyon (Gr), 30 April 1990. Larvae ate Arabis perennans in the Little Florida Mountains (Lu) on 11 April 2003 (Jim Brock). Mustards sprout, bloom and senesce by late spring. By then, larvae have fed, pupated and entered diapause. Flight. Anthocharis thoosa is univoltine with adults flying February 22 to May 29. Peak flight is March to April in southern New Mexico and a month later farther north. Males are persistent hilltoppers; females fly near the ground, seeking mustards on which to place eggs. Adults come readily to nectar, but spring can be a sparse time for flowers. I have had good luck at blooms of willow (Salix spp.). Comments. Taxonomic splitters treat thoosa (Scudder) as a full species, geographically distinct from central Rocky Mountains A. julia W. H. Edwards, northern Rocky Mountains A. stella W. H. Edwards, and Pacific/Sierra Nevada A. sara Lucas. Taxonomic lumpers, on the other hand, place all these taxa as subspecies of A. sara. If you split, then New Mexico’s thoosa populations belong to subspecies inghami Gunder. Anthocharis (sara) julia should be sought in higher mountains along the Colorado border.

Southwestern Orangetip male (Anthocharis thoosa) Rockhound State Park, Luna Co., NM; April 1, 2008 (photo by Steve Cary).
Southwestern Orangetip male (Anthocharis thoosa) east foothills, Jemez Mountains, Los Alamos Co., NM; April 7, 2020 (photo by Marc Bailey).
Southwestern Orangetip female (Anthocharis thoosa) Hondo Canyon, Sandia Mountains, Cibola National Forest, Bernalillo Co., NM; March 29 2016 (photo by Bryan E. Reynolds).
Southwestern Orangetip female (Anthocharis thoosa) Sangre de Cristo Mountains, Santa Fe Co., NM; April 11, 2018 (photo by Steve Cary).
Southwestern Orangetip larva (Anthocharis thoosa) Rockhound State Park, Luna Co., NM; April 11, 2003 (photo by Steve Cary).


Anthocharis cethura C. Felder & R. Felder   Desert Orangetip (updated March 24, 2021)

Description. Although basically white in other areas, Desert Orangetips are pale yellow in New Mexico and otherwise much like the foregoing species. The ventral hindwing marbling is gray-green. The forewing orange patch is bounded by a black cell-end bar and black apical marks. Range and Habitat. Anthocharis cethura inhabits Upper Sonoran Zone deserts in northwest Mexico, southern California, Nevada, Arizona and southwest New Mexico. In our state it inhabits desert shrublands and grasslands from the lower Tularosa Basin westward and north as far as Hatch and Silver City (counties: Ca,DA,Gr,Hi,Lu,Ot,Si), spanning 4000 to 5600′. Life History. Larvae eat various Brassicaceae including Streptanthus carinatus, Sisymbrium irio, and Thysanocarpis curvipes (Brassicaceae). Larvae ate Descurainia pinnata at Rockhound State Park on 12 April 2003 (Jim Brock). Pupae overwinter. As with Anthocharis thoosa, diapause can be extended for multiple years to survive drought. It usually takes a wet winter to provoke pupae to break diapause and produce their adults. Flight. Nominally univoltine, adult Desert Orangetips emerge with warm early spring weather. New Mexico records span March 4 and April 24. Males hilltop alongside Southwestern Orangetips and Spring Whites. Comments. This species lived here anonymously, until W. A. Baltosser found it in the Organ Mountains (DA) on 22 March 1977. Our populations belong to subspecies Anthocharis cethura pima W. H. Edwards, which some authors elevate to a full species.

‘Pima’ Desert Orangetip female (Anthocharis cethura pima) Gray Ranch, Hidalgo Co., NM; April 2, 1993 (photo by Steve Cary).
‘Pima’ Desert Orangetip male (Anthocharis cethura pima) Rockhound State Park, Luna Co., NM; March 15, 2017 (photo by Steve Cary).
‘Pima’ Desert Orangetip male (Anthocharis cethura pima) Observation Hill, Dona Ana Mountains, Dona Ana Co., NM; March 24, 2020 (photo by Jim VonLoh).
‘Pima’ Desert Orangetip (Anthocharis cethura pima) Smuggler Hills, Hidalgo Co., NM; March 31, 2003 (photo by Steve Cary).
‘Pima’ Desert Orangetip larva (Anthocharis cethura pima) Rockhound State Park, Luna Co., NM; April 12, 2003 (photo by Steve Cary)


Euchloe ausonides (Lucas)                                 Large Marble (updated December 29, 2020)

Description. All Euchloe species are of modest size with green ventral marbling, but no orange forewing apices. Large Marble has a white or cream ground color, dense, dark underside marbling, black marks at the forewing apex, and a narrow black bar in the forewing cell. Its name notwithstanding, it is no larger than our other marbles. Range and Habitat. This is the most alpine of all our Anthocharines. It lives from Alaska to central Canada, then south to higher mountains of the western US. It is a Transition to Canadian Zone dweller in our state, where it lives along streams and in high, moist meadows in our north-central mountains (counties: Be,Co,Mo,RA,SM,SF,Ta,Un?), usually 8000 to 11,000′. Life History. Alpine mustards (Brassicaceae) are larval hosts. Scott (1986) listed several genera, including Arabis, Barbarea, Descurainia, Lepidium, Raphanus, Sisymbrium, and Thelypodium. Larvae feed in summer; chrysalids overwinter. Flight. Euchloe ausonides adults fly in a single annual generation from early to mid-summer; our records span May 11 to August 9, concentrated in June to July. Adults fly weakly near the ground through alpine meadows, sometimes near treeline, frequenting streams and nectaring at meadow flowers. Comments. Some experts place Rocky Mountain populations in subspecies Euchoe ausonides coloradensis (Hy. Edwards), but variation across all North America is minor. The American Museum of Natural History in New York has a 1936 specimen from the Sandia Mtns. (Be). This represents the southernmost extent of this species, but it has not been found there since.

Large Marble (Euchloe ausonides) near Garcia Park, Carson National Forest, Sangre de Cristo Mountains, Taos Co., NM; May 20, 2009 (photo by Steve Cary).
Large Marble (Euchloe ausonides) Hopewell Lake, Carson National Forest, Tusas Mountains, Rio Arriba Co., NM; June 22, 2009 (photo by Steve Cary).
Large Marble (Euchloe ausonides) east of Black Lake, Colfax Co., NM; May 30, 2017 (photo by Steve Cary)


Euchloe olympia (W. H. Edwards)               Olympia Marble (updated December 26, 2020)

Description. On Olympia, the forewing apical black marks are reduced compared to sister species. Yellow-green underside marbling occurs in slender, loose arcs. Antennae are solid white. The ventral hindwing has a rosy blush on freshly emerged specimens. Range and Habitat. Euchloe olympia is headquartered in the Great Plains. Its southwest limit include northeast New Mexico’s high plains up to the foothills of the Sangre de Cristos (counties: Co,Cu,Gu,Ha,Mo,Qu,SM,Un). It lives in canyon and mesa country populated by shortgrass prairie, oak, juniper and piñon pine (4500 to 8500′). Life History. Mustards (Brassicaceae) host Euchloe olympia. New Mexico hosts include Arabis glabra, Descurainia pinnata, D. richardsonii, D. sophia, Lepidium campestra, and L. virginicum. Pupae overwinter. Flight. Like its congeners, Olympia is a univoltine, early spring flyer. New Mexico records span April 1 to June 9, favoring the earlier dates. Individual adults may live only one week. Adults are often found near treeless ridge tops or grassy mesa tops, tacking patiently across open expanses seeking potential mates. Flight is more aggressive in the presence of other spring hilltoppers such as Pontia sisymbrii. Comments. Our populations here at the southwest edge of its range arguably belong to subspecies Euchloe olympia rosa (W. H. Edwards). In the early 1980s, your humble author saw a map of the then known distribution of Olympia, which included southeast Colorado, western Oklahoma and Northwest Texas panhandle, but not adjacent New Mexico. I finally tracked it down on 30 April 1988, northeast of Clayton.

‘Rosa’ Olympia Marble (Euchloe olympia rosa) Caprock Park south of San Jon, Quay Co., NM; April 1, 1989 (photo by Steve Cary).
‘Rosa’ Olympia Marble (Euchloe olympia rosa) Cdar Hills, Colfax Co., NM; April 19, 1999 (photo by Steve Cary).


Euchloe lotta Beutenmiller                               Desert Marble (updated May 6, 2021)

Description. Underside marbling on Desert Marble is darker and more invaded by the white ground color that in congeners. Compared to the Large Marble, the forewing cell-end bar is broader and forewing apical marks are faded. Range and Habitat. Euchloe lottais an Upper Sonoran and Transition Zone insect. It occurs from British Columbia south through the Great Basin into Mexico. In New Mexico it lives in the northwest quadrant (counties: LA,MK,RA,Sv,SJ,Ta), 6000 to 9000’, and the southwest quadrant (counties: Ca,DA,Gr,Hi,Lu,Ot,Si,So), 4100 to 7000′. Life History. As expected, Desert Marble larvae eat mustards (Brassicaceae), such as Arabis, Caulanthus, Isatis, Descurainia, Lepidium, Sisymbrium, Stanleya, Streptanthus, Streptanthella and Thelypodium. Eggs hatch quickly, then larvae feed and pupate quickly; pupae overwinter. Flight. Euchloe lotta flies promptly in spring, when males defend hilltop territories alongside orangetips and Spring Whites. Records for southwest New Mexico start March 5 and end May 8, peaking in April. Records for northwest New Mexico span April 11 to June 4, peaking in May. Comments. Our populations formerly had been placed as a subspecies of Euchloe hyantis (W. H. Edwards).

Desert Marble (Euchloe lotta) Gila River at Mogollon Box, north of Cliff, Grant Co., NM; March 6, 2021 (photo by Steve Cary).
Desert Marble (Euchloe lotta) Little Florida Mountains, Rockhound State Park, Luna Co., NM; March 15, 2017 (photo by Steve Cary).
Desert Marble (Euchloe lotta) Heron Lake State Park, Rio Arriba Co., NM; May 6, 2021 (photo by Steve Cary).
Desert Marble larva (Euchloe lotta) Hart Canyon, San Juan Co., NM; May 21, 2001 (photo by Steve Cary)


Glutophrissa drusilla (Cramer)                    Florida White (updated August 2, 2021)

Florida White is one of three large, subtropical whites that rarely stray into New Mexico. Male Florida Whites are almost immaculate white above and below. Females have a black forewing outer margin and a yellow cast to the hindwing above. It is a tad larger than European Cabbage White. This is truly a tropical species whose home base includes Mexico, Central America, tropical South America, and the southern tip of Florida. Adults do wander widely, however, and are recorded from the interior US with surprising frequency. Wanderers are hungry, so look for them at nectar. Larval hosts are members of the pepper family (Capparidaceae), but there is no evidence of reproduction in our state. Florida White has been confirmed only twice New Mexico. Dr. Dale A. Zimmerman gets credit for our only catch, on 24 June 1971 in Silver City (Gr). Almost precisely 50 years later, Rob Wu photographed a female nectaring in the Pollinator Garden at White Sands Missile Range (DA) on July 29, 2021. She was in remarkably good condition considering how far she likely traveled. In New Mexico, this species is “least unlikely” during the summer monsoons, when many subtropical species are diffusing northward, unaware of the coming winter. Farther south, where it is resident, expect it any time of year. This butterfly was formerly in the genus Appias.

Female Florida White (Glutophrissa drusilla) White Sands Missile Range Main Post, Dona Ana Co., NM; July 29, 2021 (photo by Rob Wu).
Female nectaring on purple trailing lantana.
Male Florida White (Glutophrissa drusilla) Las Minas, Panama; August 26, 2016 (photo by Elaine Halbedel).


Neophasia menapia (C. Felder & R. Felder)       Pine White

Description. Pine Whites are indeed white, accented by black marks at the forewing apex and a black bar at the end of the forewing cell. Beneath, the hindwing is white with gray/black scaling on the veins, which can be quite heavy in females. Females also have the hindwing margin edged or outlined in red. Range and Habitat. Pine Whites inhabit mountains of western North America, including pine forests of major New Mexico mountains (counties: Be,Ca,Ci,Co,Gr,Li,LA,MK,Mo,Ot,RA,Sv,SJ,SM,SF,Si,So,Ta,To), generally 6500 to 10,000′ altitude. Life History. Larvae of Neophasia species eat developing pine needles. Neophasia menapia can utilize a variety of pine species. Pinus ponderosa (Pinaceae) is preferred in New Mexico, though Pinus edulis (piñon, or nut pine) is a distant second choice. Eggs overwinter. Flight. Pine Whites fly in one annual summer brood from June 29 to September 26, peaking in July. Their flight appears weak, yet males often soar high in the pines, beyond reach of nets and cameras. Both sexes seek nectar nearer the ground. Comments. Our oldest report is from Professor Francis Huntington Snow, who captured it in Gallinas Canyon near Las Vegas (SM) in 1882.

Pine White male (Neophasia menapia) Carrizo Peak, Lincoln National Forest, Lincoln Co., NM; July 13, 2017 (photo by Steve Cary).
Pine White female (Neophasia menapia) Jemez Falls, Jemez Mountains, Santa Fe National Forest, Sandoval Co., NM; August 2, 2019 (photo by Steve Cary).


Neophasia terlooii Behr                              Chiricahua White (updated March 11, 2021)

Description. Neophasia terlooii is one of our most sexually dimorphic species. Males resemble Pine Whites, but with an entirely black forewing cell on the upperside. Strikingly orange females have black veins and margins, resembling a miniature Monarch. Range and Habitat. Chiricahua Whites inhabit pine forests in the Mexican Sierra Madre and north as far as the high peaks of southeastern Arizona and southwestern New Mexico. Our few reports are from above 6500′ elevation in the Animas and Peloncillo Mountains (counties: Hi). Life History. Larvae eat developing needles of Pinus ponderosa, Pinus engelmannii and perhaps other pines. Flight. Neophasia terlooii is double-brooded with adults in flight during mid-summer and again in autumn, sometimes into November; our few reports are for June and September. Males float in and out of the pine canopy, descending for nectar and to investigate orange objects, hoping for females. Comments. New Mexico populations are in remote areas. Our lack of data could represent infrequent visits by observers, or we may have be unreliable, impermanent colonies that are peripheral and not always occupied.  

Chiricahua White female (Neophasia terlooii) Sunnyside Canyon, Huachuca Mountains, Cochise Co., AZ; October 25, 2020 (photo by Steve Cary).
Chiricahua White female (Neophasia terlooii) Sunnyside Canyon, Huachuca Mountains, Cochise Co., AZ; October 25, 2020 (photo by Steve Cary).
Chiricahua White male (Neophasia terlooii) Sawmill Canyon, Ft. Huachuca, Huachuca Mountains, Cochise Co., AZ; October 28, 2011 (photo by Matt Brown).


Ascia monuste (Linnaeus)            Great Southern White (updated September 13, 2021)

The subtropical Great Southern White is a little larger than Florida White, but a tad smaller than Giant White, as it should be. Brown marks decorate the forewing apex and, in females, extend inward along the veins. Females may have a black cell spot. There are vein-end dark marks on the hindwing upperside. Antennal knobs are turquoise. Great Southern Whites breed year-round in the Neotropics as far north as south Florida and south Texas. Larval hosts are from the Brassicaceae, Capparidaceae, Bataceae, Liliaceae, and Tropaeolaceae. Adults are good fliers and wander widely, resulting in accidental strays as far as the north-central US. Strays are unlikely in New Mexico, but the odds increase during and after a strong monsoon season. Hungry adults will come to nectar. Only two sightings are recorded from New Mexico. Our first was from Las Cruces (DA), 15 October 1973; the specimen is at NMSU. More recently, CJ Goin photographed a worn male at Mesilla Dam (DA) on September 6, 2021.

Great Southern White male (Ascia monuste) Resaca De La Palma State Park, Cameron Co., TX; November 2, 2017 (photo by Bryan E. Reynolds).
Great Southern White female (Ascia monuste) Resaca De La Palma State Park, Cameron Co., TX; November 2, 2017 (photo by Bryan E. Reynolds).
Great Southern White ale (Ascia monuste) Mesilla Dam, Dona Ana County, NM; September 6, 2021 (photo by CJ Goin).


Ganyra josephina (Godart)                             Giant White

Giant White is the largest of the subtropical Pierines that have strayed to New Mexico. Males are pure white with a black spot in the forewing cell. Females are similar, but with dark accents on the veins toward the wing margins. Antennal knobs are turquoise, as with Great Southern White. This species is resident in the Caribbean islands and in Central America, breeding as far north as south Texas. Other North American sightings are accidental strays. Woody Capparidaceae (peppers) serve as larval hosts for Ganyra josephina, but we have none in New Mexico and thus no reproduction can be anticipated here. Giant Whites go through several generations per year in the tropics. Adults will come to nectar at urban gardens. There is one report from New Mexico, a sight record from Albuquerque (Be) by Michael E. Toliver at his former home.

Giant White male (Ganyra josephina) Santa Ana National Wildlife Refuge, Hidalgo Co., TX; October 31, 2017 (photo by Bryan E. Reynolds).


Pontia sisymbrii (Boisduval)                             Spring White (updated December 29, 2020)

Description. Spring Whites are normal size for whites, with wingspans of about 1.5 inches. They show black forewing apical marks on the veins and a small black bar in the cell. The hindwing underside has green scales painted alongside the veins, which also may be scaled with yellow when fresh out of the chrysalis.  Range and Habitat. This western North American species ranges from the Yukon south to northwest Mexico through most of montane western US. In New Mexico it lives in Upper Sonoran to Transition Zone savannas extending onto our eastern foothills (all counties except Cu,DB,Gu,Le,Ro), 4800 to 8400′. Life History. Mustards (Brassicaceae) are larval hosts. Bailowitz and Brock (1991) listed the genera Arabis, Thysanocarpis, Descurainia and Thelypodiopsis. Scott (1986) gave Caulanthus, Sisymbrium and Streptanthus as hosts. A mature larva was seen on Schoenocrambe linearifolia, June 3, 2019, south of Santa Fe. Pupae overwinter. Flight. One of the first butterflies to fly in spring, records extend from December 21 to June 8. Males are moderate hilltoppers. Both sexes seek nectar. Comments. Populations in most of New Mexico fit the above description and are subspecies Pontia sisymbrii elivata W. Barnes & Benjamin. In Bootheel (Hi) populations, scaling on the ventral hindwing veins is reduced to postmedian chevrons; this is subspecies Pontia sisymbrii. transversa R. Holland (1995).

Spring White male (Pontia sisymbrii elivata) Hondo Canyon, South Crest Trail, Sandia Mountains, Cibola National Forest, Bernalillo Co., NM; March 31, 2016 (photo by Bryan E. Reynolds).
Spring White (Pontia sisymbrii elivata) Deer Creek, Sangre de Cristo Mountains, Santa Fe Co., NM; March 22, 2018 (photo by Steve Cary).
Spring White (Pontia sisymbrii elivata) Arroyo Hondo, Santa Fe Co., NM; March 25, 1989 (photo by Steve Cary).
‘Transversa’ Spring White (Pontia sisymbrii transversa) Deer Creek, Animas Mountains, Hidalgo Co., NM; March 31, 1993 (photo by Steve Cary).


Pontia protodice (Boisduval & Le Conte) Checkered White (updated December 29, 2020)

Description. Male Checkered Whites are mostly white with black marks at the forewing apex, a loose band of dashes and a rectangular spot in the forewing cell. Beneath, the male hindwing has gray chevrons. Females have rather heavier markings. The ventral hindwing has gray scales along the veins plus marginal and submarginal chevrons. Range and Habitat. One of the most common and widespread butterflies in New Mexico, Pontia protodice breeds from California east to Virginia and south into Mexico, straying north to Canada. In New Mexico it lives in deserts, prairies and open woodlands (all counties) up to 11,500′. Life History. Larvae eat most native mustard species (Brassicaceae), including Arabis drummondii, Schoenocrambe linearifolia, Wislizenia refracta, Lepidium densiflorum and Thelypodiopsis linearifolia. Pupae overwinter. Flight. Checkered Whites are continuously brooded where growing conditions permit. Statewide, our records span January 19 to December 30. Males often seek hilltops in the spring; both sexes come to flowers. Comments. Cold weather pupae produce form vernalis, which is more heavily marked on the underside and resembles Pontia occidentalis.

Checkered White male (Pontia protodice) Organ Mountains, Dona Ana Co., NM; June 6, 2007 (photo by Steve Cary).
Checkered White male (Pontia protodice) my yard, Santa Fe, Santa Fe Co., NM; June 2, 2017 (photo by Steve Cary).
Checkered White female (Pontia protodice) Los Alamos, Los Alamos Co., NM; October 22, 2019 (photo by Marc Bailey).
Checkered White female (Pontia protodice) my yard, Santa Fe, Santa Fe Co., NM; June 2, 2017 (photo by Steve Cary).
Checkered White larva (Pontia protodice) 4 miles NE of Aztec, San Juan Co., NM; May 20, 2001 (photo by Steve Cary).


Pontia occidentalis (Reakirt)                         Western White

Description. Very similar to Checkered Whites, Western Whites have upperside forewing postmedian spots connected in an arc and veins are penciled with black. Gray-green scales are painted broadly along the ventral hindwing veins. Range and Habitat. Pontia occidentalis lives from the southern Rockies and the Sierra Nevada north into Canada and Alaska. In New Mexico it seems to be present in the high plains and in Hudsonian Zone areas above treeline (counties: Co,Gu,SM,TA). Life History. Scott (1992) gave Descurainia richardsonii and Rorippa teres (Brassicaceae) as hosts. “Last July, in Las Vegas, N. M., my little son Martin, found a number of larvae which I took to be those of Pieris protodice, living upon Cleome serrulata [Rocky Mountain bee plant; Capparidaceae]. As the food-plant was a new one I requested him to rear the butterflies . . . when they emerged . . . they were . . . occidentalis” Cockerell (1901a). Flight. This species is bivoltine. A spring generation flies from March to April; the summer brood from July to August. Males hilltop. Comments. Confusion is possible with Pontia protodice, particularly with heavily marked spring form vernalis. Butterflyers seeking Western Whites in New Mexico are routinely frustrated not just by the inaccessibility of their known habitat, but also by the superabundance and ubiquity of the similar Checkered White, not to mention the identification challenges about which has been said, “current knowledge doesn’t allow separation of many/most individuals” (Glassberg 2017: 38). Your best option is to focus on getting multiple dorsal and ventral photos of individuals in good or better condition, so you can inspect all diagnostic marks.

Western White female (Pontia occidentalis) Chapman Campground, White River National Forest, Pitkin Co., CO; July 4, 2018 (photo by Steve Cary).
Western White female (Pontia occidentalis) Rowdy Lake near Silver Jack Reservoir, Gunnison Co., CO; June 30, 2018 (photo by Steve Cary).
Western white female (Pontia occidentalis) Gold Hill above Red River, Taos Co., NM; August 16, 2001 (photo by Steve Cary).
Western White male (Pontia occidentalis) Chapman Campground, White River National Forest, Pitkin Co., CO; July 2, 2018 (photo by Steve Cary).
Western White male (Pontia occidentalis) Twin Lakes, Lake Co., CO; July 13, 2019 (photo by Steve Cary).


Pontia beckerii W. H. Edwards                       Becker’s White

Description. Resemblance of Becker’s White to ubiquitous Checkered White causes some confusion about the extent of this species in New Mexico. Becker’s is white with black dorsal forewing apical marks. A squarish spot in the forewing cell is noticeably bolder and blacker than in Pontia protodice. Ventral hindwings have green scaling along the veins. Range and Habitat. Becker’s White is a Great Basin insect distributed from Baja California north to British Columbia and east across the Great Basin to the central Colorado Rockies. It occupies shrubby hillsides and arroyos. In New Mexico it occupies our northwest quadrant, but it also occurs near Raton (counties: Co,MK?,RA,SJ), 5000 to 6800′. Life History. Mustards (Brassicaceae) are larval hosts. Scott (1986) listed species in the genera Isomeris, Stanleya, Arabis, Brassica, Sisymbrium, Lepidium, Descurainia and Thelypodium. Winter is passed as a chrysalis. Flight. The spring flight extends from at least May 5 to May 18. There also are southern Colorado records from July 22 to September 14, indicating a late summer brood. Adults seek nectar in open areas and drainage bottoms. Comments. Many more observations in northwest New Mexico are needed to fill out our limited knowledge of this insect in our state.

Becker’s White (Pontia beckerii) Barela Mesa, Las Animas Co., CO; August 17, 1996 (photo by Steve Cary).
Becker’s White (Pontia beckerii) Capitol Reef National Park, Wayne Co., UT; July 19, 2014 (photo by Steve Cary).
Becker’s White male (Pontia beckerii) Ridgway State Park, Ouray Co., CO; June 26, 2018 (photo by Steve Cary).


Pieris rapae (Linnaeus)                European Cabbage White (updated March 14, 2021)

Description. As you probably already know from experience, Cabbage White has a black dorsal forewing tip, a gray-green ventral hindwing, one (males) or two (females) black spots on the forewing above, and a deceptively tumbling flight. Range and Habitat. The Eurasian Cabbage White has invaded all of temperate North America and, though not as successful as in the eastern US, it is scattered in human communities throughout New Mexico (all counties but Ch,MK?). Pieris rapae occupies disturbed (that is, human) habitats that are routinely found in urbanized, suburban or agricultural areas. Life History. Vegetable and ornamental gardeners know the life cycle of this butterfly only too well. Larvae eat foliage of cabbage, broccoli and other alien (non-native) species of Brassicaceae. Pupae overwinter. Flight. Adults emerge in spring and produce successive broods until winter cold. New Mexico records span February 12 to December 19 and suggest two or three broods depending on local growing season length. Adults fly near the host and come to nectar. Comments. This species is not native to North America and it is the only such exotic butterfly species that has made a home in New Mexico. “No other butterfly is so successful over such a great variety and expanse of landscape” (Robert Michael Pyle). In New Mexico, communities that thrived in the past, but are now uninhabited ghost towns, still retain surviving exotic Brassicaceae dating back to miners’ vegetable gardens: Cabbage Whites still fly there, having persisted where humans could not.

European Cabbage white (Pieris rapae) Rio en Medio trail below Falls, Sangre de Cristo Mountains, Santa Fe Co., NM; July 7, 2020 (photo by Steve Cary).
European Cabbage White (Pieris rapae) Los Alamos, Los Alamos Co., NM; September 26, 2015 (photo by Selvi Viswanathan).
European Cabbage White (Pieris rapae) near Mesilla, Dona Ana Co., NM; August 14, 2020 (photo by Jim VonLoh).
European Cabbage White (Pieris rapae) Sugarite Canyon State Park, Colfax Co., NM; June 30, 2007 (photo by Steve Cary).


Pieris marginalis Scudder                            Margined White (updated December 27, 2020)

Description. Margined Whites resemble European Cabbage Whites, being white above with a dark forewing apex. Undersides, however, are creamy white with gray scaling on hindwing veins. Females may have dark scales on upperside hindwing veins as well. Scaling of VHW veins tends to be heavier in spring individuals and lighter in summer individuals. The old name, ‘Veined’ White, seems more appropriate than ‘Margined’ White. Range and Habitat. Pieris marginalis lives across boreal North America from Alaska to Labrador. It also occurs south in the Rocky Mountains to New Mexico, where it flies along riparian corridors in our higher mountain settings (counties: Be,Ca,Co,LA,Li,MK?,Mo,Ot,RA,Sv,SM,SF,Ta), 7500 to 11,000′. Life History. Scott (1986) listed many host genera among the native mustards (Brassicaceae). One female oviposited on Cardamine cordifolia along the South Fork Rio Bonito (Li) on 19 April 2002 (S. Cary). Flight. Overwintering chrysalids divulge adults in spring. Flight peaks in April to June and again July to August, with a partial third brood in September. Extreme dates are April 9 and September 12. Adults fly near the ground in sunny openings, often visiting nectar and damp sand. Comments. This butterfly is placed by some taxonomists with Old World Pieris napi (Linneaus). Most workers now consider New World populations to comprise multiple species, none of which is Pieris napi. Populations in the Mogollon (Ca) and Sacramento Mountains (Li,Ot) are Pieris marginalis mogollon Burdick, described in 1942. North-central New Mexico has Pieris marginalis mcdunnoughii C. Remington.

‘McDunnough’s’ Margined White summer form (Pieris marginalis mcdunnoughii) lower Rio en Medio, Sangre de Cristo Mountains, Santa Fe Co., NM; July 7, 2020 (photo by Steve Cary).
‘McDunnough’s’ Margined White summer form (Pieris marginalis mcdunnoughii) Pacheco Canyon, Sangre de Cristo Mountains, Santa Fe Co., NM; June 29, 2017 (photo by Steve Cary).
‘McDunnough’s’ Margined White spring form (Pieris marginalis mcdunnoughii) Winsor Creek above Cowles, Sangre de Cristo Mountains, San Miguel Co., NM; April 24, 2017 (photo by Steve Cary).
‘McDunnough’s’ Margined White spring form (Pieris marginalis mcdunnoughii) Hondo Canyon, South Crest Trail, Sandia Mountains, Cibola National Forest, Bernalillo Co., NM; April 14, 2017 (photo by Bryan E. Reynolds).
‘Mogollon’ Margined White summer form (Pieris marginalis mogollon) Eagle Creek, Lincoln National Forest, Lincoln Co., NM; June 26, 2001 (photo by Steve Cary).

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