_Butterfly._--Small. The tibiæ and the tarsi of the mesothoracic and metathoracic legs are more lightly armed with spines than in the genera _Argynnis_ and _Brenthis_. The palpi are not swollen. They are clothed with long hairs and have the third joint finely pointed. The antennæ are about half as long as the costa of the fore wings, and are provided with a short, heavy, excavated, or spoon-shaped club. The subcostal of the fore wings is five-branched, the first nervule always arising before the end of the cell, the second at the end or just beyond it. The cell of the primaries is closed, of the secondaries open. The markings upon the wings are altogether different from those in the two preceding genera, and the spots on the under side of the wings are not silvered, as in the genus _Brenthis_. _Egg._--The egg is rounded at the base, subconical, truncated, and depressed at the upper end and fluted by light raised ridges (see p. 4, Fig. 8). _Caterpillar._--The larvæ are cylindrical, armed in the mature form on each segment with comparatively short spines thickly covered with diverging hairs, or needle-shaped spines. They are known in some species to be gregarious in their early stages, and then to separate before maturity. They feed upon the _Scrophulariaceæ_, upon _Castileja_, _Diplopappus_, and other plants. _Chrysalis._--The chrysalis is pendant, rounded at the head, provided with more or less sharply pointed tubercles on the dorsal surface, and generally white or some shade of light gray, blotched with brown or black, and marked with reddish or orange spots on the dorsal side. [Illustration FIG. 91.--Neuration of the genus _Melitæa_.] This genus is very large and is distributed widely over all the colder portions of the north temperate zone. There are many species found in Europe, in Siberia, in China, and in the northern islands of Japan. On the upper slopes of the Himalayas it is also represented by a few species. In North America the genus is well represented, the most of the species being found upon the mountain-slopes and in the valleys of the Pacific coast region. Only two species occur in the Eastern States. (1) =Melitæa phaëton=, Drury, Plate XVI, Fig. 1, ♂; Plate V, Figs. 15, 16, _chrysalis_ (The Baltimore). _Butterfly_, ♂.--The upper side is black, with a marginal row of red spots, followed by three rows of pale-yellow spots on the fore wings and two on the hind wings. Besides these there are some large red spots on the cells of both wings, a large red spot about the middle of the costa of the hind wing, and a few scattering yellow spots, forming an incomplete fourth row on the fore wing and an incomplete third row on the hind wing. On the under side all the spots of the upper side reappear, but heavier and more distinct, and on the hind wings there are two additional rows of yellow spots, and a number of irregular patches of red and yellow at the base of both wings.