_Butterfly._--Characterized by the considerable enlargement and the disposition in regular bands of the pale spots on the upper side of the primaries, and by the tendency to a grayish cast in the darker markings of the upper side, some specimens, especially females, being quite gray. Expanse, ♂, 1.50 inch; ♀, 2.00 inches. _Early Stages._--The food-plants, according to Henry Edwards, who described the caterpillar and chrysalis in the "Canadian Entomologist," vol. v, p. 167, are _Erodium cicutarium_, clover, and violets. The habitat of this species is southern California. (12) =Melitæa acastus=, Edwards, Plate XVI, Fig. 11, ♂; Fig. 12, ♂, _under side_ (Acastus). _Butterfly._--With thinner and less robust wings than any of the species of the genus hitherto mentioned. It is prevalently fulvous upon the upper side, and on the under side of the hind wings heavily and somewhat regularly banded with yellowish-white spots, possessing some pearly luster. Expanse, ♂, 1.50 inch; ♀, 1.60 inch. _Early Stages._--Unknown. Common in Nevada, Utah, and Montana. (13) =Melitæa palla=, Boisduval, Plate XVI, Fig. 13, ♂; Fig. 14, ♂, _under side_ (The Northern Checker-spot). _Butterfly._--On the upper side resembling the preceding species, but with the median band of spots on the hind wings paler. On the under side the markings are different, as is shown in the plate. Expanse, ♂, 1.50 inch; ♀, 1.75 inch. _Early Stages._--The larva and chrysalis were described by Henry Edwards, the actor naturalist, in the "Proceedings of the California Academy of Sciences," vol. v, p. 167. The food-plant is _Castileja_. The species ranges from California to Colorado, and northward into British Columbia. (14) =Melitæa whitneyi=, Behr, Plate XVII, Fig. 7, ♂; Fig. 8, ♂, _under side_ (Whitney's Checker-spot). _Butterfly._--The markings are much as in _M. palla_, the spots are lighter fulvous and larger than in that species, the yellow bands on the under side are more prominent, and the marginal spots have a silvery luster which is lacking in _M. palla_. The female has the yellow of the under side more prominent than is the case in the male sex. Expanse, ♂, 1.50 inch; ♀, 1.70 inch. _Early Stages._--Altogether unknown. Whitney's Checker-spot ranges from California into Nevada. (15) =Melitæa hoffmanni=, Behr, Plate XVII, Fig. 13, ♂; Fig. 14, ♀, _aberration_ (Hoffmann's Checker-spot). _Butterfly_, ♂.--General style of marking much as in the two preceding species, but with the basal area black, and the black markings toward the outer margin not so heavy, giving it here a more fulvous appearance. The median bands on both wings are broader and paler than in _M. palla._ The under side is much as in the last-mentioned species, but the yellow markings are more prominent. ♀.--Much like the male. Expanse, ♂, 1.35 inch; ♀, 1.45 inch. _Early Stages._--Unknown.