Butterfly.—The upper side of the wings of both sexes is well represented in the plate. On the under side the wings are uniformly reddish-brown, with the primaries black at the base, and the median spots enlarged near the inner margin and whitish, as in the preceding species. The light spots of the upper side reappear below as pale spots, which are well defined on the dark ground-color. Expanse, 1.25-1.40 inch.
Early Stages.—Unknown.
The species ranges from southern Colorado to Arizona.
Genus THYMELICUS, Hübner
Butterfly.—The antennæ are short, less than half the length of the costa; the club is stout and short, somewhat crooked just at the end. The third joint of the palpi is conical, almost concealed in the thick vestiture of the second joint. The neuration is given in the cut.
Egg.—The egg is hemispherical, with the surface marked by irregular angular cells formed by slightly raised lines.
Caterpillar.—The caterpillars feed on grasses. They are long and slender, thicker behind than before, covered with short hair. They are generally dark in color, and not green as are the caterpillars in most of the hesperid genera.
Chrysalis.—I can discover no account of any observations made upon the chrysalids of this genus.
(1) Thymelicus brettus, Boisduval and Leconte, Plate XLVII, Fig. 40, ♂; Fig. 41, ♁ (The Whirlabout).