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Montana Field Guide

Montana Field Guides

Jutta Arctic - Oeneis jutta


Global Rank: G5
State Rank: S5

Agency Status
USFWS:
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General Description
[From Ferris and Brown 1981; Scott 1986; Opler and Wright 1999; Glassberg 2001] Forewing 2.7-3.0 cm. Uppersurface brown, forewing with orange submarginal band or rings surrounding 1-4 black eyespots; undersurface with variably contrasting dark median band.

Phenology
One flight; mostly mid-June to mid-July, late May to mid-June in Ontario, mid-June to early August in Newfoundland and Labrador; often odd years in Alaska, the Great Lakes region, Saskatchewan, northwestern Wyoming and even years in Colorado, Manitoba, Ontario to Newfoundland (Scott 1986). Late June to mid-August (Glassberg 2001).

Diagnostic Characteristics
Best determined by uppersurface brown, forewing with orange submarginal band or rings surrounding 1-4 black eyespots; hindwing uniformly dark.

Species Range
Montana Range

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Range Comments
In North America, from Alaska south to northeastern Utah and northern Colorado, east across boreal Canada to northern Great Lakes region to Labrador, Quebec, Newfoundland, and Maine (Ferris and Brown 1981; Scott 1986; Opler and Wright 1999; Glassberg 2001); to at least 3048 m in the Rocky Mountain states. Reported in Montana from at least 15 counties in the western third of the state (Kohler 1980; Stanford and Opler 1993). Locally uncommon (Glassberg 2001).

Migration
Non-migratory.

Habitat
Lodgepole pine forest in Rocky Mountains, wet tundra and spruce bogs across boreal regions in the north and east (Ferris and Brown 1981; Scott 1986; Opler and Wright 1999; Guppy and Shepard 2001). Reported in Greater Yellowstone Ecosystem in lodgepole pine forest and acid bogs (Debinski and Pritchard 2002).

Food Habits
Larval food plants include Carex (at least three species), Eriophorum, and Juncus (Ferris and Brown 1981; Scott 1986, 1992; Guppy and Shepard 2001). Adults sip flower nectar, including Arnica and Geranium (Scott 2014).

Reproductive Characteristics
Little information. Females lay eggs haphazardly near host plant. Larvae feed on host leaves, build no nests. Overwintering (hibernation) occurs by L1-L3 instars the first winter, L4-L6 the second winter, pupate on the ground or in moss (Scott 1986; Guppy and Shepard 2001). Males establish territories in small forest clearings or gentle swales, perch on logs, tree trunks, or low plants to await passing females, and occasionally patrol (Scott 1982, 1986; Guppy and Shepard 2001).

References
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Citation for data on this website:
Jutta Arctic — Oeneis jutta.  Montana Field Guide.  .  Retrieved on , from