A KEY TO THE ASIATIC GENERA OF THE IIESPERIIDsE. 419 



Key to the Asiatic Genera. 

 A. Eadial of hindwing fully developed. 



a. Male with a costal fold on forewino-. 



a 1 . Hind tibiaa with terminal pair of spurs only. 



Casyapa, Kirby. 

 b\ Hind tlbise with both terminal and medial pairs of spurs. 



*Okthophcettjs, nom. nov. 



b. Male with no costal fold on forewing, 



a 1 . Male, inner margin of forewing longer than outer 

 margin. 

 a 2 . Cell of hindwing reaching up to or rather bevond 

 middle of wing. 



Calliana, Moore. 

 b 2 . Cell of hindwing short, not reaching to middle of 

 wing. 



Pisola, Moore. 



b 1 . Male, outer margin of forewing longer than inner 



margin. 



a 2 . Forewing apically produced, outer margin straight. 



Capila, Moore. 



b 2 . Forewing not apically produced, outer margin convex* 



Crossiura, de Niceville. 



33. Tladial of hindwing wanting {i.e., not fully developed into a 



tubular vein). 



a. fCell of forewing more than two-thirds the length of costa. 



a 1 . Male with a costal fold on forewing, and with no tuft of 



hair on hind tibiae. 



Achalarus, Scudder. 



b l . Male with no costal fold on forewing, but with a tuft of 



hair on hind tibiae. 



Hantana, Moore. 



* I propose this generic name for xflianceus and its allies, the name Ptaroxys being pre- 

 occupied in Heterocera. 0. phanmus is on the wing before sunrise. 



f In measuring these distances, the length of the cell should be taken from the bifurca- 

 tion of the median and subcostal nervures to the extreme apex of the cell, which in nearly 

 every genus is at the origin of the fifth subcostal branch ; the length of the costa should be 

 taken in a straight line from the baae of the costa, where it joins the thorax, to the extreme 

 apex of the wing, which is situated practically at the extremity of the fourth subcostal 

 branch. In referring above to the fifth subcostal branch, it would perhaps be more correct 

 to say " terminal portion of subcostal nervure," 



