Butterflies and Moths of North America

collecting and sharing data about Lepidoptera

Cassiope Blue
Plebejus cassiope (J. Emmel & T. Emmel, 1998)

Family: Lycaenidae
Subfamily: Polyommatinae
Identification: Upperside of male metallic, pale gray-blue, female dark brown. Underside dark brown with pattern of black spots in white field on hindwing. Forewing submarginal black spots sq1uarish or oblong. Hindwing usually has black discal spot present.
Wing Span: 3/4 - 1 inches (2.1 - 2.5 cm).
Life History: Eggs are laid singly on leaves, bracts, or sepals of the host plant. Caterpillars or chrysalids hibernate.
Flight: One flight from early July to September.
Caterpillar Hosts: Cassiope mertensiana.
Adult Food: Flower nectar.
Habitat: Lush subalpine slopes.
Range: Limited range in California in Trinity Alps and near crest of Sierra Nevada.
Conservation: Study conservation needs, if any, of subspecies kelsoni Emmel and Emmel in Trinnity Alps.
NCGR: G3,G4 -Very rare or local throughout its range or found locally in a restricted range OR Apparently secure globally, though it might be quite rare in parts of its range, especially at the periphery. Subspecies kelsoni is rank T1 - Critically imperiled because of extreme rarity (5 or fewer occurrences, or very few remaining individuals), or because of some factor of its biology making it especially vulnerable to extinction. (Critically endangered throughout its range).
Management Needs: Study conservation needs and implement if necessary.
Comments: NULL