514 BULLETIN UNITED STATES GEOLOG-ICAL SURVEY. 



4. Colias eriphyle, Edw., (new species). 



From Milk Eiver. This species much resembles philodice in color, 

 but is paler and of smaller average size. The marginal fuscous borders 

 are pale-colored, and are cut to the edge of the wing by the yellow 

 nervules, and the inner side of these borders is almost always crenated. 

 The discal spot on the upper side of the fore wings is small, oval, and 

 black, of hind wings is orange, single, and almovst always deep orange; 

 on the under side, the surface of the hind wings and the costal mar- 

 gin of fore wings is largely dusted with fine brown scales ; the discal spot 

 of the fore wings has a yellow central streak, and that of the hind wings 

 is single (with an occasional exception), small, either white or roseate, in 

 a ferruginous ring. 3Iost often the surface of both wings, apart from the 

 discal spots, is immaculate, showing no trace of submarginal brown 

 points or spot at outer angle of hind wings. 



I first received examples of this species from Mr. T. L. Mead, who took 

 them in Colorado, in 1871, and was disposed to regard them as a variety 

 of philodice. Subsequently I received about 50 specimens, taken by the 

 late G. R. Crotch, in British Columbia, and later, 1874, several speci- 

 mens, which were taken by Mr. Py well on the line of the !Northern Pacific 

 Kailroad west of Bismarck. This material enables me to judge with 

 confidence of the distinctness of this species. It is not; in my opinion, 

 a variety of philodice, nor is it occidentalis, Scudder, to which it bears 

 some resemblance. 



No other Fapilionidce were collected by the expedition, though no doubt 

 several of the large Papilios — eurymedon, daunus, and rutuhis — should, 

 at the proper season, be found in that latitude. So the Coliades, scudderi 

 and alexandra, should be common throughout that part of the mountains, 

 and the ochraceous species astrcea, of which two or three specimens only 

 have as yet been brought to notice, collected by the Expedition of Dr. 

 Hayden on the Yellowstone. 



DANAID^. 



5. Danais archippus. 



This species inhabits the entire continent below the sub-boreal regions, 

 and has even reached the Sandwich Islands. It is large-bodied and 

 strong of wing, and its larvae finding a food-plant in any species of milk- 

 weed [Asclepias) the butterfly has penetrated every district in which 



these j)lants grow. 



NYMPHALID^. 



6. Argynnis edtcardsi, Eeakirt. 



This large and beautiful species was taken on Chief Mountain, 

 August 15. It ranges from Colorado to Montana, and appears to be 

 confined to the mountains. It may be known by its large size, by the 

 long and pointed fore wings, and by the great size of the silver spots 

 that ornament its under side. The ground-color of this side in both 

 sexes is of an olive-green, and forms a good distinctive character. 



