3tf8 JO VRNAL, BOMB A T NATURAL EISTOR Y SOCIETY, Vol. IX. 



broad. Thoeax broad. Abdomen rather stout, of the same length as 

 the hindwing. Legs, hindleg with the tibia slightly fringed, and 

 furnished with two pairs of spines. Secondary sexual characters 

 consist on the forewing of a dense tuft of long hairs attached to the 

 base of the inner margin and turned under and forwards ; the basal 

 portions of the median and submedian nervures on the underside 

 furnished with raised lines of scales : and on the hindwing there is a 

 small oval oblique streak on the upperside close to the base of the 

 wing, this gland is almost certainly correlated with the curious 

 " tuning-fork " shape of the base of the costal and subcostal 

 nervures. 



Gehenna appears to be nearest to the genus Halpe, Moore, from 

 which it differs in the forewing in the first median nervule arising 

 much nearer to the base of the wing ; the male also has a tuft of hairs 

 on the inner margin near the base of the wing ; and the swollen bases 

 of the median and submedian nervures are not found in any species of 

 Halpe ; in the hindwing it differs in the curious u tuning-fork " 

 bifurcation of the costal and subcostal nervures, with an oval gland in 

 the male placed between the bases of the prongs of the fork ; in Halpe 

 in the male only the first subcostal nervule makes a " tuning-fork " 

 at its origin from the subcostal nervure ; in the female these veins are 

 normal ; the discoidal cell is much longer, extending to at least 

 the middle if not beyond the middle of the wing ; the first subcostal 

 nervule arises much nearer the base of the wing ; the hindwing 

 too differs greatly in shape, being very much longer than broad 

 in the type species of Halpe (which I take to be H. moorei, Watson, 

 from which Mr. Moore must have diagnosed his genus, and not 

 from the true H. beturia, Hewitson, from Celebes), the hindwing is 

 exactly as broad as long in both sexes. I have drawn up this 

 diagnosis from Gehenna grce.ce, de Niceville, having been under 

 the impression till Captain "Watson pointed out my oversight that 

 the genus was undescribed. The description is published as it is 

 somewhat more full than Captain Watson's, which was drawn up 

 from " Hesperia" abima, Hewitson, the only other known species 

 in the genus. 



