|scientific name Colias canadensis |
common name Canada Sulphur
Moist, open areas including shrub willow-birch valley bottoms and alpine tundra.
One yearly brood peaking from late May to late July, depending on habitat.
The only other Alberta Colias with a dorsal orange colour that extends all the way to the forewing base are meadii and eurytheme. The Canada Sulphur, however, has the pink outline of the underside discal spot smeared outwards, and almost always lacks the hindwing underside submarginal dark spots. This species was only recently found to be distinct from C. hecla by Cliff Ferris (1988).
The mature larva overwinters, and is dark green covered with short, fine hairs arising from small black spots (Guppy & Shepard 2001). The dorsal line is dark, and the lateral line is white and pinkish-red (Guppy & Shepard 2001).
Not of concern.
The larval foodplants are unkown, but are likely to be legumes. Females lay eggs on Hedysarum (Fabaceae) in captivity, and larvae can be successfully reared on red clover (Guppy & Shepard 2001).
Eastern Alaska to northern BC and Alberta (Opler 1999), south in the Alberta foothills to Highwood Pass (Layberry et al. 1998).
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