OF NORTH AMERICA. 109 



BOMBYCID^i;. 



PLATYPTERYGIN^. 



J^, Genus DREPANA. Schrank. 



^^: 



Wings ample, body slender. Head broad, flat. Front wide, some- 

 what longer than broad, sides nearly parallel, smooth and finely scaled. 

 Palpi short, closely appressed to the head, not exceeding the front. 

 Tongue short. Antennas short, simple in ? , with long pectinations in 

 i . Thorax slender. Patagia small, hairy. Abdomen slender, cylin- 

 drical, smooth, not reaching the anal angle of secondaries. Legs long, 

 slender ; two posterior pairs each with two spurs on the apex of the 

 tibiae. 



Anterior wings broad ; costa full at the base, straight in the middle, 

 very convex on the outer third. Apex very acute and much produced, 

 distinctly falcate. Outer margin smooth, somewhat convex near the 

 anal angle, which is distinct. Inner margin rather longer than outer 

 margin, straight. Median vein four-branched; second median nervule 

 as far from third as third from fourth. Internal vein straight. Costal 

 vein long, terminating near the apex. Subcostal very close to costal 

 vein. First subcostal nervule arises midway between the base of the 

 wing and discal nerve, and forks near the apex, both branches going 

 to the costa. Second and third subcostal nervules long, bent down- 

 ward to the outer margin. Discal vein strongly angulated outwardly, 

 the median branch much the longest. 



Secondaries ample ; costa straight, full at the base ; apex and outer 

 margin rounded ; anal angle distinct ,' inner margin long and straight ; 

 costal vein long, straight, much arched at its basal origin. Subcostal 

 vein slender, very near the costal, forking at its middle, where it nearly 

 merges into the costal vein. Median vein four-branched, nervules very 

 long; second median nervule twice as far from third as first from second; 

 second nearly as far from third as third from fourth. Internal vein 

 long. 



Larva closely allied to that of Centra. 



This genus is distinguished from Flatypteryx Laspeyres (Edapteryx, 

 Packard) by the distinctly falcate anterior wings, and the entire, instead 

 of sinuated outer margin. Laspeyres' genus originally included the 



