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Montana Field Guide

Montana Field Guides

Sheridan's Hairstreak - Callophrys sheridanii


Global Rank: G5
State Rank: S5

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General Description
[From Ferris and Brown 1981; Scott 1986; Opler and Wright 1999; Glassberg 2001; Pyle 2002] Forearm 1.0-1.1 cm. Wings with white fringe, sometimes with gray to black marginal line. Uppersurface gray; undersurface apple-green (especially the basal region), forewing with few on no postmedian white markings, hindwing with a thick or thin postmedian white line (not extremely sinuous) bordered inwardly with black, discontinuous white spots, or no white markings.

Phenology
One flight; late March to mid-May at low elevation and mid-June through July at high elevation in Colorado northward, March to September in the southwestern deserts (Scott 1986). March to mid-June in the Rocky Mountain region, April to May at low elevation and June through July at high elevation in the Pacific Coast states (Glassberg 2001). Early March to early August in Oregon and Washington (Pyle 2002), early March to mid-July in Oregon (Warren 2005), mid-April to mid May at low elevation and late June to late July at high elevation in British Columbia (Guppy and Shepard 2001).

Diagnostic Characteristics
Best determined in our region by the undersurface apple-green (especially the basal region), forewing with few on no postmedian white markings, hindwing with a thick or thin postmedian white line (not extremely sinuous) bordered inwardly with black.

Species Range
Montana Range

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Range Comments
Southern British Columbia, southern Alberta, and western North Dakota south through western mountains and high plains to central California, southern Utah, and southern New Mexico (Scott 1986; Oppler and Wright 1999; Glassberg 2001); up to about 2560 m elevation in Rocky Mountain states (Brown 1957; Ferris and Brown 1981), 213 m to 2500 m elevation in Oregon (Warren 2005), to 2200 m elevation in British Columbia (Guppy and Shepard 2001). In Montana, reported from at least 30 counties across the state (Kohler 1980; Stanford and Opler 1993; FLMNH Lepidopterists' Society database) except the northeastern tier and extreme southeastern corner; 1829 m to 3048 m elevation in Greater Yellowstone Ecosystem (Debinski et al. 2013). Locally common in the Rocky Mountain region, locally rare to uncommon in the Pacific Coast states (Glassberg 2001).

Summary of Observations Submitted for Montana
Number of Observations: 1

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Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Migration
Non-migratory.

Habitat
Montane meadows, brushy ravines, sagebrush-steppe, chaparral, above treeline in rocky alpine swales and chutes, open terrain (Scott 1986; Opler and Wright 1999; Glasberg 2001; Pyle 2002). In Glacier National Park, Montana reported from transition areas between forest and alpine terrain (Debinski 1993); in Greater Yellowstone Ecosystem (including Gallatin County, Montana) reported in xeric montane meadows dominated by sagebrush (Debinski et al. 2013).

Food Habits
Larval food plants include multiple species of Eriogonum, including E. umbellatum, jamesi, and compositim for the subspecies found in our region (Ferris and Brown 1981; Scott 1986, 1992, 2006; Pyle 2002; Warren 2005). Adults feed on flower nectar, including Arctostaphylos, Berberis, Cerastium, Claytonia, Cymopterus, Eriogonum, Lesquerella, Lomatium, Mertensia, Ranunculus, and Thlaspi (Scott 2014).

Reproductive Characteristics
Females lay eggs singly (40 eggs reported for one female) on host plant, mostly on young leaves (Scott 1986, 1992, 2006; James and Nunnallee 2011). Eggs hatch in about 6 days (depending on temperature), developing to L4 instar and pupating 28-35 days post oviposition. Mature L4 instar seeks refuge in curled dead leaves for pupation. Larvae solitary, feed on host plant leaves, do not build nest or shelter, hibernate as pupae (Scott 1979, 1986; James and Nunnallee 2011). Males perch throughout the day on rocks or bare ground in hillside swales, flatland depressions, canyon or ravine bottoms awaiting passing females (Scott 1975b, 1986; James and Nunnallee 2011).

References
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Citation for data on this website:
Sheridan's Hairstreak — Callophrys sheridanii.  Montana Field Guide.  .  Retrieved on , from