1864.] 391 



Legs broadly pilose, spreading on each side to the ungues. Hind 

 tarsi closely scaled ; % tibiae with a long broad oblong tuft, once 

 wrinkled. Abdomen long, compressed, with a slight anal tuft. 



This genus is readily distinguished from Hapialus not only by its 

 greater size, but by important structural characters. The head is 

 smaller and more free from the thorax; the wings are more falcate, 

 with a fuller inner edge. The apex of the hind wings are more pro- 

 duced. Hepialus does not possess the large square tuft on the hind 

 tibiae, nor the elongated abdomen. 



The wings are covered with broad irregular bands of silvery scales, 

 which are more uniformly spread over the surface in S. humuli of Europe, 

 which likewise belongs to this genus. This last named species has, 

 with G. Lihatiia, been placed by Hiibner in his genus Gorgopis. But 

 our species cannot be referred to this genus, as restricted by Walker to 

 Gnrgnpis Lllianla Hiibn. (Cramer sp.) and G. caffra Steph. (MSS.) 

 which have, according to his description, (Cat. Lep. Br. jMus. VII. p. 

 1565) " long and slender palpi extending beyond the head ; 3rd joint 

 elongated," while the antennae are deeply pectinated, and the seconda- 

 ries reach a little beyond the tip of the abdomen. Also the costa of 

 the primaries is straight and the outer border is but slightly oblique. 



Our genus does not seem to extend to the tropics, but to be confined 

 to the temperate zone of Europe and America, and on this continent its 

 species are found on the confines of the subarctic regions in the Hudson's 

 Bay Territory. 



Sthenopis argenteomaculata. 



Mepiahis argenteomaculatus Harr., Cat. Ins. Mass. p. 72. (1835). 



Rt. Ins. Mass. p. 295. (1841). 

 Third edit. fig. 410. (1862). 

 , Gosse, Can. Nat. p. 248. (1840). 



Agassiz, Lake Superior, p. .389. PI. 7, fig. 6. (1854). 

 Walk., Cat. Lep. Br. Mus. VII. p. 1556. (1856). 

 Morris, Synopsis Lep. N. Amer. p. 123. (1862). 

 Gorgopis argenteomaculata Packard, Bost. Journ. Nat. Hist. p. 596. (1863). 



Grote, Proc. Ent. Soc. p. 73. (April, 1864). 



Lake Superior, (Coll. Harris. M. C. Z., Prof L. Agassiz.) Sas- 

 katchewan, Scudder, (Coll. M. C. Z.) St. Martin's Falls, Albany River, 

 Hudson's Bay, Barnston, (Walk.) " Canada West, Stevens," (Walk.) 

 " Eastern Townships," (Gosse.) " Sorel," (D'Urban.) 



