104 ZYGjENID^ and BOMBYCIDiE 



B0MBYCID5;. 

 HEPIALIN5;. 

 Genus STHENOPIS. Packard. 



" Head small, prominent, front longer than broad, narrowing a 

 little anteriorly ; scales of the front long pilose, thin. Palpi slender, 

 reaching nearly to the front, thinly spreading scales ; third joint hardly 

 distinguishable from the second. Antennae short filiform. Thorax 

 short, subglobose, scales much raised behind. 



" Primaries nearly half as broad as long ; costa convex at base, and 

 especially so towards the falcate apex, which is subacute ; outer margin 

 concave below ; internal angle much rounded ; inner edge full, convex. 

 Second subcostal nervule subdivides within its middle, while in He- 

 pialus it subdivides beyond its middle. First subcostal much curved 

 beyond its middle, following the contour of the costa. 



" Secondaries reach a little beyond the middle of the abdomen ; 

 costa somewhat concave before the middle, beyond convex, apex 

 produced acutely ; outer margin not very full ; wings broadest from 

 the internal angle to the costa. In both wings the distance between 

 the origins of the fourth median nervule and the submedian nervure, 

 where it throws off the connecting branch, is less than the distance 

 between the same nervule and the origin of the third. The reverse of 

 this occurs in Hepialus. 



" Legs broadly pilose, spreading on each side 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 Hepialus not only by its 

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

 ler and more free from the thorax ; the wings are more falcate, with a 

 fuller inner edge. The apex of the hind wings is more produced. 

 Hepialus does not possess the large square tuft on the hind tibiae, nor 

 the elongated abdomen." 



Pack., Proc. Ent. Soc. Phil., vol. 3, p. 391. 



The species of this genus are generally of large size, and have the 

 wings covered with broad irregular banes of silvery scales. The two 



