This species, which is found in California and Nevada, is subject to extreme variation, and I have placed upon the plate one out of many beautiful and singular aberrations which I possess. (16) =Melitæa gabbi=, Behr, Plate XVI, Fig. 15, ♂ (Gabb's Checker-spot). _Butterfly._--In the style of its markings on the upper side it almost completely resembles _M. acastus_, but the dark markings are slighter, giving the wings a more fulvous appearance. On the under side the bands are narrower, defined more sharply with black, and pearly, almost silvery white, whereas in _acastus_ they are pale yellowish-white, and not so lustrous. Expanse, ♂, 1.20 inch; ♀, 1.50 inch. _Early Stages._--Unknown. The habitat of this species is southern California. (17) =Melitæa harrisi=, Scudder, Plate XVII, Fig. 5, ♂; Fig. 6, ♀, _under side_; Plate V, Figs. 17-18, _chrysalis_ (Harris' Checker-spot). _Butterfly_, ♂.--Wings fulvous, black at the base and on the outer margin, with five fulvous spots in the cell of the fore wing, two below the cell; and three in the cell of the hind wing. The black border is widest at the apex of the fore wing, and below this runs inwardly on the veins. There are two white spots near the apex. At the anal angle on the hind wing the border is somewhat divided so as to present the appearance of two indistinct lines. On the under side the wings are fulvous, marked with black bands and spots, and crossed by bands and crescents of pale yellow, as is shown in the figure on the plate. ♀.--The female is much like the male. Expanse, ♂, 1.50 inch; ♀, 1.75 inch. _Egg._--The eggs are lemon-yellow, in the form of a truncated cone, with fifteen or sixteen vertical ribs, which are highest about the middle. _Caterpillar._--The matured caterpillar is reddish-fulvous, with a black stripe on the back. Each segment is marked with one black ring before and two black rings behind the sets of spiny tubercles with which the segments are adorned. There are nine rows of spines, those above the feet being quite small. The spines are black, tapering, and set with diverging black hairs. The food-plants are aster and _Diplopappus umbellatus_. _Chrysalis._--The chrysalis is pearly-gray or white, blotched with dark brown or black. This choice little butterfly ranges from Nova Scotia to Wisconsin, extending as far south as northern Illinois, and northward to Ottawa. (18) =Melitæa elada=, Hewitson, Plate XVII, Fig. 2, ♂ (Hewitson's Checker-spot).