105 



These two forms difEer from each, other slightly, but with apparent con- 

 stancy. Irioides is slightly the larger, never has the median stripe of the un- 

 der surface of the hind wings bordered with white, as sometimes occurs in 

 Croesioides; it lacks generally the depth of tint upon the basal half of the un- 

 der surface of the hind wings, peculiar to Croesioides, the male has a smaller 

 discal stigma, and the female has nearly the whole upjjer surface of the wings 

 distinctly suffused with dull ferruginous. 



5. CALLOPHRYS Billb. (1820). 



[Lycus Iliibii., 1816, preocc] 

 Type : Papilio rubi Linn. 



201. dumetonim Boisd., Ann. Soc. Ent. Fr. [2], 10, 291 {Thecla). 



mridis Edw., Proc. Acad. Nat. Sc, 1862, 223 {Thecla). 



ajjinis Edw., Proc. Acad. Nat. Sc, 1862, 223-4 {Thecla). 

 California, Nevada, Utah. 

 Food-plant : Hosackia. 



C. dumetorum diflFers but slightly fron C. riibi of Europe, and is the only one 

 of our hair-streaks that may be thoup .t common to the two continents. Our 

 species has the upper surface of the ' mgs darker than the European, with less 

 of a russet hue ; and the mesial band of white spots on the under surface of 

 the hind wings is less frequently subobsolete, and almost always nearly or 

 quite straight ; while in C. rubi, when continuous it curves as much as the 

 hind border, to which it is parallel. After an examination of the type of 

 affinis, I cannot see why it should be specifically distinguished from dumeto- 

 rum. Mr. Henry Edwards informs me that it occurs only in elevated districts, 

 and thinks it should be separated as a mountain variety. 



6. STIIYMON Hubn. (1816). 



Type : Chrysophanus Mopsus Iliibn. 



202. Titns Fabr., Ent. Syst., 3, 1, 297 (Hesperia) ; God., Encycl. Meth., 9, 688 

 {Polyommatus) ; Steph., Cat. Lep. Brit. Mus., 1, 260 (Z^/iCC^a); West w., 

 Gen. Diurn. Lep., 494 {Lycaena) ; Butl., Cat. Fabr. Lep., 191 {t^tryvion). 

 Mopsus Hiibn., Zutr. Exot. Schmett., 1, 24, figs. 135-6 {Chryso- 

 phanus) ; lb., Vez. Schmett., 74 {Strymon) ; Boisd.-LeC, Lup. Am. 

 Sept., 109-110, pi. 34, figs. 1-6 {Thecla). 



Maine, New Hampshire, Southern Ontario, Minnesota and Iowa, to Georgia, 

 Alabama and Texas, and westward through Missouri and Kansas to Colorado, 

 New Mexico, Northern Oregon and Vancouver's Island. 



Food-plants : Conoclinium coelestinum, Quercus, wild cherry, cultivated plum. 



BUL. BUF. soc. NAT. SCI. (14) MAT, 1876. 



