Arrowhead Blue

Glaucopsyche piasus

Appearance: Below, light to dark gray with distinct band of white “arrowheads” pointing inward on the hindwing. Also shows white spike in basal area of hindwing disk. Above, blue with brown margins and fringes checkered black and white.

Size: Small; 1 1/8 to 1 3/8 inches

Habitat: Open woods, trails, meadows, streamsides, slopes, sagebrush flats with lupines

Season: March to July

Larval Foodplant: Lupine and milk vetch species in the pea family

Did You Know…
Some blues, including possibly Arrowhead Blues, have developed a symbiotic relationship with ants. The caterpillars secrete a sweet liquid (honeydew) which is utilized by the ants as food and in turn the ants protect the caterpillars from other insect predators.

Species Gallery (click to enlarge)