266 



MB. It. M'lACHLAN ON A SYSTEMATIC 



of one, for which I adopt the name longus. The 6 varies in 

 having the wings either vitreous, or uniformly tinted with pale 

 brown, according to maturity ; trux is a very immature <S , with 

 the abdomen mutilated ; hence the discrepancy in the length of 

 body. Loquax is the ordinary fully mature form of the % , the 

 fore wings being strongly margined with brown on the costa, and 

 the hind wings almost uniformly deep golden yellow; anticus 

 is less mature, with the wings vitreous and the pterostigma pale. 

 The locality, " Brazil," given for loqiiax by Walker, is a mis- 

 print for " Bengal. 



Genus Hybeis, Lefebvre. 



(Bubo, part., Bamb., Hag. ; Ogcogaster, part., West.) 



Wings elongate, considerably dilated in the middle ; the extreme 

 base of the inner margin of the anterior wings with an exci- 

 sion, followed by a rather prominent axillary angle, not appen- 

 diculate : network rather close ; pterostigma large ; transverse 

 branch of the lower cubitus confluent wdth the postcosta in all 

 the wings. 



Antenna as long as the wings ; in the 6 the basal portion is 

 bowed outwardly, afterwards nearly straight, without teeth or 

 hairs ; in the ? straight : club shortly and broadly pyriform, 

 almost truncate. 



Eyes with the upper division rather larger than the lower. 



Thorax slightly villose. 



Abdomen rather shorter than the anterior wings, laterally com- 

 pressed in both sexes: in the 6 furnished with appendices, 

 which are usually rather long, cylindrical, and forcipate, or 

 shorter and somewhat spoon-shaped. 

 Legs with the spurs of the posterior tibiae about the length of 



the first tarsal joint. 

 Sab. India China, Japan, and the Malay archipelago. 



Closely allied to Acheron, and also to Olyptobasis, notwith- 

 standing the appendiculate wings of the latter genus. 



Species. 



I am not prepared to give any definite information as to the 

 number of species. All the forms that I have seen present a re- 

 markable similarity in general appearance ; yet that there are 

 several species is absolutely certain from the structure of the 6 

 appendices, which in H. angulata are remarkably dissimilar. 



