California State Insect

California Dogface Butterfly

(Zerene eurydice)

Adopted in 1972.

The California dogface butterfly or dog head, Zerene eurydice, was designated the official State Insect in 1972. The butterfly is found only in California from the foothills of the Sierra Nevada to the Coast Ranges and from Sonoma south to San Diego. The male has a yellow silhouette of a dog's head on its wings. The female is usually entirely yellow with a black spot on the upper wings.

California Dogface (Colias eurydice [Boisduval])

Wing span: 2 - 2 1/2 inches (5.1 - 6.3 cm).

Identification: Black outer half of male forewing encloses yellow-orange "dog's head" tinged with light purple iridescence. Black "eye" very near or touching the border. Hindwing yellow-orange, sometimes with black border. Female all yellow with a black upper forewing cell spot; sometimes with scattered black scaling on outer half.

Life history: Males patrol for females.

Flight: Two flights from April-May and July-August.

Caterpillar hosts: Usually false indigo (Amorpha californica) in the pea family (Fabaceae).

Adult food: Flower nectar.

Habitat: Foothills, chaparral, oak or coniferous woodlands.

Range: North-central California south to Baja California, west of the central mountains and deserts.