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Eurymedon
Butterfly.--This beautiful insect belongs to the same group as the four succeeding species. In the style of the markings it recalls P. turnus, but the ground-color is always pale whitish-yellow or white, the tails of the hind wings are more slender, and the white marginal spots on the under side of the fore wings are fused together, forming a continuous band. There are other differences, but these, with the help of the plate, will suffice for the ready identification of the species. Expanse, 3.50-4.00 inches.
Early Stages.--The caterpillar resembles that of P. turnus, but may be distinguished by its paler color and the much smaller spots composing the longitudinal series on the back and sides, and by the different color of the head. It feeds upon a variety of plants, and is especially partial to Rhamnus californicus.
The species ranges from Mexico to Alaska, and eastward as far as Colorado. It is abundant in the valleys of the Coast Range, and I have found it very common in the canon of the Fraser River, in British Columbia, in the month of June.