Search Field Guide
Advanced Search
Montana Field Guide

Montana Field Guides

Snowberry Checkerspot - Euphydryas colon


Global Rank: G5
State Rank: SNR

Agency Status
USFWS:
USFS:
BLM:


 

External Links





 
General Description
[From Ferris and Brown 1981; Scott 1986; Opler and Wright 1999; Glassberg 2001; Pyle 2002] Forewing 2.2-2.6 cm. Variable. White spots often present off-center on abdomen. Uppersurface coal-black with numerous cream-colored dots inward and red-orange spots along margins, forewing with two reddish-orange bars bounded by pale yellow or yellow-cream; undersurface of forewing reddish-orange with buff or yellow rows of spots, undersurface of hindwing with red and yellow alternating bands, border red, an irregular broken black line runs through pale yellow median band.

Phenology
One flight; May to June in California and Oregon (Scott 1986), mainly May to July outside of California (Glassberg 2001), late April to early August in Oregon (Warren 2005), late April to late August in Oregon and Washington (Pyle 2002).

Diagnostic Characteristics
Probably best determined on the wing by a combination of white spots often present off-center on abdomen, uppersurface coal-black with numerous cream-colored dots inward and red-orange spots along margins, uppersurface of forewing with two reddish-orange bars bounded by pale yellow or yellow-cream, undersurface of hindwing with red and yellow alternating bands, border red, an irregular broken black line runs through pale yellow median band. Similar to Euphydryas editha, with an unstable taxonomic history.

Species Range
Montana Range

Click the legend blocks above to view individual ranges.
 


Range Comments
Central Washington east to the continental divide in Montana, south through California and western Nevada to central Arizona (Glassberg 2001; Pyle 2002); from 30 m to at least 1830 m elevation in Oregon (Warren 2005). In Montana, reported from most counties west of or adjacent to the continental divide (Kohler 1980; Stanford and Opler 1993). Common to abundant (Glassberg 2001).

Migration
Non-migratory.

Habitat
Mountain and foothill shrubsteppe, sagebrush steppe, forest margins, open woodlands, meadows, forest roadsides, streamsides (Pyle 2002; James and Nunnallee 2011). Habitat in Montana not described but likely similar.

Food Habits
Larval food plants include Antirrhinum, Castilleja, Lonicera, Mimulus, Penstemon (several species), Plantago, Symphoricarpos (several species), and Verbascum (Ferris and Brown 1981; Bowers 1985; Scott 1986; Guppy and Shepard 2001; Pyle 2002; Warren 2005; James and Nunnallee 2011). Adults feed on flower nectar (including Anaphalis, Polygonum, Senecio), scat, and mud (Pyle 2002; James and Nunnallee 2011; Scott 2014; K. Dubois pers. obs.).

Reproductive Characteristics
Females lay eggs in large clusters (50-200 eggs/cluster) on undersides of hostplant leaves. Eggs hatch in 8-17 days. L1-L3 instars gregarious, build messy silk nests, reach L3 instar in 21-40 days. L2-L3 instars overwinter, commence feeding in 2-13 days after termination of diapause, develop to L4 instar in 7-23 days, may reenter dormancy more than once, probably reach L6 or possibly L7 instar before adulthood (depending on environmental conditions). Post-diapause larval instars solitary, feed openly, wander prior to pupation, pupate about 20 days after terminating diapause. Adults eclose (emerge from pupae) 10-20 days later (Scott 1979; James and Nunnallee 2011). Males patrol throughout the day or perch on exposed vegetation in clearings, hilltops seeking females (Scott 1986; Pyle 2002; James and Nunnallee 2011).

References
Login Logout
Citation for data on this website:
Snowberry Checkerspot — Euphydryas colon.  Montana Field Guide.  .  Retrieved on , from