_Butterfly._--The male is dark in color; the female is paler. There are two eye-spots on the fore wings in the usual location, indistinct on the upper, distinct on the lower side of the wings. The under sides of the wings are variable. In the type they are dark; in other specimens they are paler. They may or may not have ocelli on the secondaries. The form with obsolescent ocelli has been named _silvestris_ by Edwards. Both the fore and hind wings are abundantly and evenly marked by little striæ, and crossed on either side of the median area by obscure, irregular, transverse dark lines, either one or both of which may be wanting in some specimens. Expanse, 1.50-1.75 inch. _Early Stages._--These have been described and beautifully figured by Edwards in the third volume of his great work, to which the reader may refer. The caterpillar is green, cylindrical, tapering before and behind, marked with longitudinal pale-yellow lines. The chrysalis is green or black, striped with narrow white lines. The egg is somewhat firkin-shaped, flat at the top and base, vertically ribbed, and honey-yellow. The larva feeds on grasses. _Charon_ is found in the Northwest, ranging from British Columbia as far as New Mexico. (7) =Satyrus oetus=, Boisduval, Plate XXVI, Fig. 7, ♂; Fig. 8, ♂, _under side_ (Boisduval's Satyr). _Butterfly._--Larger than _charon_, paler on the upper side, especially in the female sex, in which the outer third of the primaries is reddish-fawn. On the under side the secondaries of the male are without ocelli, or at most faint traces of ocelli appear. In the female the ocelli near the anal angle of the secondaries are usually well developed. Expanse, 1.60-2.00 inches. _Early Stages._--These await description. The species is found in northern California. (8) =Satyrus sthenele=, Boisduval, Plate XXVI, Fig. 20, ♂, _under side_ (The Least Wood-nymph). _Butterfly._--Quite small, superficially resembling _charon_. The female is paler and the ocelli are larger and more distinct than in _charon_. The distinguishing mark of this species is the irregular, dark, twice-strangulated band of the secondaries, bordered on both sides externally by whitish shades. This is shown in our figure. Expanse, 1.40-1.50 inch. _Early Stages._--Unknown. The species is Californian. Genus OENEIS, Hübner (=Chionobas=, _Boisd._) (The Arctics) "To reside In thrilling region of thick-ribbed ice." SHAKESPEARE.