Great Basin Fritillary
Description 1 1/2 - 2 3/8"  Small. Above, commonly
orange-brown and darker at base with black pattern of spots, bars,
and chevrons; brown with yellow-brown outer areas in N. Rockies.

Below, FW dull yellow with very little orange except in some females
and in California and S. Oregon populations; HW has small silver
spots (lacking in S. California and occasionally elsewhere), marginal
spots flattened with narrow brown or greenish caps. HW disk below
usually light brown or dirty tan but may be reddish-brown, green, or
gray-olive.

Life Cycle Caterpillar overwinters just after hatching. Older
caterpillar gray-brown with black and yellow bands and many yellow
or white branching spines. Host plant is violet.  Dark brown chrysalis
has yellow-brown patches, dark wing cases, and dark cross stripes
on abdomen.

Flight 1 brood; late June to mid-August.

Habitat Forests including pine, spruce, and aspen; redwood forest
clearings.

Range Washington south to central California, S. Utah, east to
central Montana and NW. Colorado.

Discussion The Great Basin Fritillary is most common in cooler
parts of the Great Basin, but also occurs in the mountains
surrounding it. Adults gather on hilltops in California, and often feed
on flowers. The California Coast Range populations south of San
Francisco to Santa Barbara are reddish above and washed out
below with a violet tinge and no silver spots.

The Adiaste Fritillary is allied with the Great Basin Fritillary by some
authors, held distinct by others. It flies in southern California
mountains.
Summer 2005
Summer 2005
Summer 2006
Summer 2006
Summer 2006