|scientific name Glaucopsyche piasus |
common name Arrowhead Blue
Prairie grassland valley slopes and hillsides near lupine patches.
One yearly flight, peaking in mid-June.
One of our most distinctive blues with its white arrow-shaped marks on the hindwing underside and black-and-white checkered wing fringe. Subspecies daunia (W.H. Edwards) occurs in Alberta (Bird et al. 1995).
The immature stages are incompletely described; the mature larvae can be yellow-brown or green with pale or reddish dorsal and lateral stripes and oblique lateral bands (Layberry et al. 1998). Pupae hibernate (Layberry et al. 1998). This species tends to be uncommon and local in Alberta.
There are less than 20 known occurrences of this species in the province.
The larval hostplant is not confirmed for Canadian populations, but adults are always closely associated with lupines (Lupinus spp.) in the west (Bird et al. 1995, Guppy & Shepard 2001). The distribution of Lupinus argenteus in Alberta closely resembles that of the Arrowhead Blue (Moss 1992, Bird et al. 1995).
Distributed from the dry valleys of southern BC east to the Cypress Hills of Saskatchewan (Layberry et al. 1998) south to Baja California and New Mexico (Opler 1999).
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