Edith's Checkerspot - Euphydryas editha
[From Ferris and Brown 1981; Scott 1986; Glassberg 2001, Pyle 2002] Forearm 1.3-2.1 cm. Most easily separated by the processes of the male genetalia, one clubbed the other tapered, making great than 90 degree angle with respect to each other. Forewing usually rounded, abdomen without white off-center (subdorsal) spots, lower half of antennae clubs with much black; dorsal surface a combination of red, black, and cream bands and checkers; ventral surface of forewing with postmedian cream spot along lower edge with heavier black scaling on basal (inner) side, hindwing postmedian orange band often extends into median cream band; pale ventral hindwing median band sometimes narrow so that black line outward of band separates two reddish areas (bands).
One flight; March and April on the California coast, June in the Great Basin, late June to early August above treeline (Scott 1986); May to early August in the Rocky Mountains (Ferris and Brown 1981); early April to late August in Oregon and Washington (Pyle 2002).
Best separated by the processes of the male genitalia, one clubbed the other tapered, making great than 90 degree angle with respect to each other. Also useful are a combination of forewing usually rounded, abdomen without white off-center (subdorsal) spots, lower half of antennae clubs with much black, ventral surface of forewing with postmedian cream spot along lower edge with heavier black scaling on basal (inner) side.
West of the Great Plains, from southern British Columbia and the Rocky Mountains of Alberta south to northern Baja California, southern Utah, and southern Colorado (Scott 1986; Glassberg 2001). In Montana, reported from the western two-thirds of the state (Kohler 1980, Stanford and Opler 1993). Generally locally rare to uncommon, common at high elevations in the Sierra Nevada of California (Glassberg 2001).
Observations in Montana Natural Heritage Program Database
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Non-migratory. Adults may move up to 10 km, but average movements to about 200 m (Scott 1986).
Chaparral, coastal prairie, sagebrush steppe, high ridges, open woodlands and montane meadows, above treeline in alpine tundra and fellfield (Ehrlich and Wheye 1984; Scott 1986; Pyle 2002; James and Nunnallee 2011); to at least 2440 m elevation in Oregon and Washington, to 3300 m elevation in Colorado, Wyoming and Montana. In Montana, reported from above treeline in the Beartooth Mountains and Glacier National Park, and many other localities where the habitat not described (Kohler 1980; Hendricks 1986; Debinski 1993).
Larval food plants include Castilleja, Collinsia, Lonicera, Mimulus, Orthocarpos, Pedicularis, Penstemon, Plantago, Plectritis, and Valerianella. Adults feed on flower nectar (including Achillea, Agoseris, Allium, Erigeron, Eriodictyon, Erioganum, Lesquerella, Lomatium, Mimulus, Pseudocymopterus, Senecio, Taraxacum, Wyethia) (Ferris and Brown 1981; Ehrlich and Wheye 1984; Scott 1986, 2014; Guppy and Shepard 2001; Pyle 2002; James and Nunnallee 2011).
Females lay eggs in clusters of 20-350, up to 1200 eggs in a lifetime. Number of eggs per ovariole (1/8 of total) about 170 (Ehrlich and Ehrlich 1978). Eggs laid on the undersides of host leaves or flower inflorescences. Eggs hatch in about 8-9 days (depending on temperature). Larvae live in loose silk webs during the first three instars (L1-L3). Development from L1-L4 takes about 30 days; L3 and L4 instars hibernate (diapause), often under stones or curled leaves. After diapause is broken, L4 reach L5 in about 14 days, pupating a few days later (Scott 1986; James and Nunnallee 2011). Males seeking females patrol and perch throughout the day on ridge crests and hilltops, sometimes perch on shrubs (Scott 1975b, 1986); adults live about 7 days on average.
- Literature Cited AboveLegend: View Online Publication
- Debinski, D. 1993. Butterflies of Glacier National Park, Montana. Occasional Papers of the Museum of Natural History, the University of Kansas, Lawrence, Kansas. No. 159: 1-13.
- Ehrlich, A.H. and P.R. Ehrlich. 1978. Reproductive strategies in the butterflies: I. Mating frequency, plugging, and egg number. Journal of the Kansas Entomological Society 51(4): 666-697.
- Ehrlich, P.R. and D. Wheye. 1984. Some observations on spatial distribution in a montane population of Euphydryas editha. Journal of Research on the Lepidoptera 23(2): 143-152.
- Ferris, C.D. and F.M. Brown (eds). 1981. Butterflies of the Rocky Mountains. Univ. of Oklahoma Press. Norman. 442 pp.
- Glassberg, J. 2001. Butterflies through Binoculars: A Field Guide to the Butterflies of Western North America. Oxford University Press.
- Guppy, C.S. and J.H. Shepard. 2001. Butterflies of British Columbia: including western Alberta, southern Yukon, the Alaska Panhandle, Washington, northern Oregon, northern Idaho, northwestern Montana. UBC Press (Vancouver, BC) and Royal British Columbia Museum (Victoria, BC). 414 pp.
- Hendricks, P. 1986. Avian predation of alpine butterflies. Journal of the Lepidopterists' Society 40(2): 129.
- James, D.G. and D. Nunnallee. 2011. Life histories of Cascadia butterflies. Corvallis, OR: Oregon State University Press. 447 p.
- Kohler, S. 1980. Checklist of Montana Butterflies (Rhopalocera). Journal of the Lepidopterists' Society 34(1): 1-19.
- Pyle, R.M. 2002. The butterflies of Cascadia: a field guide to all the species of Washington, Oregon, and surrounding territories. Seattle Audubon Society, Seattle, Washington. 420 pp.
- Scott, J.A. 1975b. Mate-locating behavior of western North American butterflies. Journal of Research on the Lepidoptera 14:1-40.
- Scott, J.A. 1986. The butterflies of North America: a natural history and field guide. Stanford University Press, Stanford, California.
- Scott, J.A. 2014. Lepidoptera of North America 13. Flower visitation by Colorado butterflies (40,615 records) with a review of the literature on pollination of Colorado plants and butterfly attraction (Lepidoptera: Hersperioidea and Papilionoidea). Contributions of the C.P. Gillette Museum of Arthopod Diversity. Fort Collins, CO: Colorado State University. 190 p.
- Stanford, R.E. and P.A. Opler. 1993. Atlas of western USA butterflies: including adjacent parts of Canada and Mexico. Unpubl. Report. Denver and Fort Collins, Colorado 275 pp.
- Additional ReferencesLegend: View Online Publication
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- Allen, T.J., J.P. Brock, and J. Glassberg. 2005. Caterpillars in the field and garden: a field guide to the butterfly caterpillars of North America. Oxford University Press.
- Brock, J.P. and K. Kaufman. 2003. Kaufman Field Guide to Butterflies of North America. Houghton Mifflin Company, New York, NY 284 pp.
- Caruthers, J.C., and D. Debinski. 2006. Montane meadow butterfly species distributions in the Greater Yellowstone Ecosystem. University of Wyoming National Park Service Research Center Annual Report, 2006. Vol. 30, Art. 14. 85-96.
- Debinski, D.M. and J.A. Pritchard. 2002. A field guide to the butterflies of the Greater Yellowstone Ecosystem. Lanham, MD: Roberts Rinehart Publishers. 107 p.
- Layberry, R.A., P.W. Hall, and J.D. LaFontaine. 1998. The Butterflies of Canada. University of Toronto Press. 280 pp. + color plates.
- Scott, J.A. 1992. Hostplant records for butterflies and skippers (mostly from Colorado) 1959-1992, with new life histories and notes on oviposition, immatures, and ecology. Papilio new series #6. 185 p.
- Simanonok, M.P., and L.A. Burkle. 2014. Partitioning interaction turnover among alpine pollination networks: Spatial temporal, and environmental patterns. Ecosphere 5(11):149.
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