[a]Fig. 118.]—Neuration of the genus Erebia, enlarged.
Egg.—Subconical, flattened at the base and at the top, the sides marked by numerous raised vertical ridges, which occasionally branch or intersect each other.
Caterpillar.—The head is globular, the body cylindrical, tapering gradually backward from the head, the last segment slightly bifurcate.
Chrysalis.—The chrysalis is formed about the roots of grass and on the surface of the ground, either lying loosely there or surrounded by a few strands of silk. The chrysalis is convex, both ventrally and dorsally, humped on the thorax, produced at the head; all the projections well rounded. The chrysalids are generally some shade of light brown or ashen-gray, with darker stripes and spots. This genus is arctic, and only found in the cooler regions of the North or upon elevated mountain summits. A few species range downward to lower levels in more temperate climates, but these are exceptional cases.
(1) Erebia discoidalis, Kirby, Plate XXV, Fig. 19, ♂ (The Red-streaked Alpine).
Butterfly.—Easily distinguished by the plain black wings, relieved by a reddish-brown shade on the disk of the primaries on the upper side.
Early Stages.—Hitherto undescribed.
This species is found in the far North. My specimens came from the shores of Hudson Bay.
(2) Erebia disa, var. mancinus, Doubleday and Hewitson, Plate XXV, Fig. 23, ♂ (The Alaskan Alpine).