_Butterfly_, ♂.--The dark markings on the upper side are much heavier than in either of the two preceding species, and the fulvous spots are smaller, the marginal crescents more regular and distinct. The markings on the under side are also much heavier than in _P. batesi_ or _P. pratensis._ ♀.--The female is like the male, but all the dark markings are heavier and the pale markings lighter. Expanse, ♂, 1.35 inch; ♀, 1.60 inch. _Early Stages._--These remain to be described. _Phyciodes orseis_ ranges from Washington Territory in the north to Mexico in the south. (9) =Phyciodes camillus=, Edwards, Plate XVII, Fig. 32, ♂; Fig. 33, ♀; Fig. 34, ♂, _under side_ (The Camillus Crescent). _Butterfly_, ♂.--The male is more like _P. pratensis_, but the light spots on the primaries are paler, on the secondaries brighter, fulvous. The dark markings on the under side are less pronounced than in _pratensis_. ♀.--The female is much like the male. Expanse, ♂, 1.30 inch; ♀, 1.50 inch. _Early Stages._--These are wholly unknown. The species is reported from British Columbia, Colorado, Montana, Kansas, and Texas. (10) =Phyciodes mylitta=, Edwards, Plate XVII, Fig. 40, ♂, _under side_; Fig. 41, ♂ (The Mylitta Crescent). _Butterfly_, ♂.--Broadly bright fulvous on the upper side, with the dark markings slight; on the under side closely resembling _P. tharos_, var. _marcia_, Edwards. ♀.--The female is like the male, but paler. Expanse, ♂, 1.15 inch; ♀, 1.25-1.50 inch. _Early Stages._--These have been described by Mr. Harrison G. Dyar in the "Canadian Entomologist," vol. xxiii, p. 203. The eggs are laid in clusters upon the thistle (_Carduus_). The caterpillar in its final stage after the fourth moult is black, yellowish below, with a faint twinned yellow dorsal line and faint lines of the same color on the sides. The spines, which are arranged in six rows, are black; those of segments four, five, and six, yellow. The chrysalis is dull wood-brown. This species has a wide range in the region of the Rocky Mountains, extending from Washington to Arizona, and eastward to Colorado. (11) =Phyciodes barnesi=, Skinner, Plate XVIII, Fig. 5, ♂ (Barnes' Crescent-spot). _Butterfly_, ♂.--Very like the following species, with the light fulvous of the upper side of the wings more widely extended, causing the dark markings to be greatly restricted. The figure in the plate is, in this species as in most others, that of the type, and I am under obligations to Dr. Skinner for kind permission to have the use of the specimen. Expanse, 1.75 inch. The type came from Colorado Springs. (12) =Phyciodes montana=, Behr, Plate XVII, Fig. 26, ♀, _under side_; Fig. 27, ♀ (The Mountain Crescent-spot).