Butterflies and Moths of North America

collecting and sharing data about Lepidoptera

Sooty Hairstreak
Satyrium fuliginosum (W.H. Edwards, 1861)


Family: Lycaenidae
Subfamily: Theclinae
Identification: No tails. Upperside drab dark gray. Underside gray to grayish brown; forewing with a line of white-bordered dark spots which may be lacking.
Wing Span: 1 - 1 1/4 inches (2.5 - 3.2 cm).
Life History: Males patrol and occasionally perch to seek receptive females. Females lay eggs singly on host plant or at its base in litter.
Flight: One flight from July-August.
Caterpillar Hosts: Various lupines (Lupinus species) in the pea family (Fabaceae).
Adult Food: Flower nectar.
Habitat: Sagebrush hills, meadows, fields, road edges.
Range: Local within its range. British Columbia south to central California, east to Wyoming and northern Colorado.
Conservation: Not usually required.
NCGR: G4 - Apparently secure globally, though it might be quite rare in parts of its range, especially at the periphery.
Management Needs: None reported.
Comments: NULL