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Mylitta Crescent
Butterfly, male.--Broadly bright fulvous on the upper side, with the dark markings slight; on the under side closely resembling P. tharos, var. marcia, Edwards.
female.--The female is like the male, but paler. Expanse, male, 1.15 inch; female, 1.25-1.50 inch.
Early Stages.--These have been described by Mr. Harrison G. Dyar in the "Canadian Entomologist," vol. xxiii, p. 203. The eggs are laid in clusters upon the thistle (Carduus). The caterpillar in its final stage after the fourth moult is black, yellowish below, with a faint twinned yellow dorsal line and faint lines of the same color on the sides. The spines, which are arranged in six rows, are black; those of segments four, five, and six, yellow. The chrysalis is dull wood-brown.
This species has a wide range in the region of the Rocky Mountains, extending from Washington to Arizona, and eastward to Colorado.