|scientific name Colias meadii W.H. Edwards|
common name Mead's Sulphur
Lush subalpine and alpine meadows.
One brood, the flight peaking between early July to early August.
The only other Alberta Colias with a dorsal orange colour that extends all the way to the forewing base is the Canada Sulphur (C. canadensis). The Canada Sulphur, however, has the pink outline of the underside discal spot smeared outwards, and is a brighter orange (not burnt-orange). Our populations are subspecies elis.
D. Macaulay image
A description of the immature stages is summarized by Guppy & Shepard (2001). The yellow-green eggs are conical in shape. The mature larvae are dark yellowish-green and covered in short black hairs, with a yellow subdorsal and white lateral line. The pupae are yellow green with a dark dorsal line. It is possible that this species overwinters twice before reaching maturity.
Not of concern.
The larval host plants are not known in Canada. in Wyoming and Colorado, subspecies meadii feeds on legumes such as Astragalus and Trifolium (Guppy & Shepard 2001). There are no published reports of adult nectar sources.
There are several discontinuous populations of Mead's Sulphur from Tumbler Ridge, BC south to Colorado and extreme northern New Mexico (Layberry et al. 1998, Opler 1999). It occurs primarily in the front ranges of the Rockies.
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