(5) =OEneis ivallda=, Mead, Plate XXVII, Fig. 9, ♂ (Mead's Arctic). _Butterfly._--This species is easily distinguished from all others by the peculiar pale ashen-brown of the upper side of the wings. It is not a common species, and is apparently restricted to the mountains of Nevada, principally about Lake Tahoe, though it probably occurs elsewhere. Expanse, 1.90-2.10 inches. _Early Stages._--Unknown. (6) =OEneis varuna=, Edwards, Plate XXVII, Fig. 8, ♂ (The Varuna Butterfly). _Butterfly._--This species is much smaller than any of those which have thus far been mentioned. It is found in the prairie lands of Montana, North Dakota, and the parts of Canada adjacent. It is not uncommon about Calgary. It is light in color on the upper side of the wings, and on the under side it is mottled with brown, strongly marked with blackish blotches or shades. Expanse, 1.50-1.60 inch. _Early Stages._--These await description. (7) =OEneis uhleri=, Reakirt, Plate XXVII, Fig. 12, ♂ (Uhler's Arctic). _Butterfly._--This species is found in Colorado. It is redder on the upper side than _varuna_, and the females are generally very richly ornamented with eye-spots on the outer borders of both the fore and hind wings. Expanse, 1.45-1.55 inch. _Early Stages._--These have been most thoroughly described and beautifully delineated by Edwards. (8) =OEneis jutta=, Hübner, Plate XXVII, Fig. 5, ♀ (The Nova Scotian). _Butterfly._--This beautiful species, which is also found in Europe, is not uncommon in the State of Maine as far south as Bangor, and occurs also in Nova Scotia, and ranges thence westward to Ottawa and the Hudson Bay country. It is one of the more conspicuous species of the genus, the eye-like spots upon the wings having a very striking appearance. Expanse, 1.80-2.10 inches. _Early Stages._--For a thorough knowledge of these the reader may consult the pages of Scudder and Edwards. (9) =OEneis semidea=, Say, Plate XXVII, Fig. 11, ♂; Plate III, Figs. 1, 2, 4, 7, 15, _larva_; Plate IV, Figs. 4, 5, _chrysalis_ (The White Mountain Butterfly). _Butterfly._--This species has thin wings, and is much darker in color than any of the species which have thus far been mentioned. It is restricted in its habitat to the summit of Mount Washington, in New Hampshire, and only reappears on the high mountains of Colorado and in Labrador. Its life-history has been very carefully worked out. It is to be hoped that entomologists and tourists resorting to Mount Washington will not suffer it to disappear by reason of too wholesale a capture of the specimens, which hover about the barren rocks on which the race has existed since the great continental ice-sheet melted away and vanished from the face of New England. Expanse, 1.75 inch. _Early Stages._--The curious reader is again referred for a knowledge of these to the pages of Scudder and Edwards. They are similar to those of other species, and the generic description which has been given must suffice for all in this work.