268 



ME. R. M'lACHLAN ON A SYSTEMATIC 



Genus Gtlyptobasis, n. g. 



(Ogcogaster, part , Westwd., Hag.) 



Wings elongate, much dilated in the middle, narrow at the base ; 

 network rather close ; branch of the lower cubitus confluent 

 with the postcosta in all the wings : anterior pair appendicu- 

 late. 



Antenna rather shorter than the wings ; in the S slightly bent 

 at the base, and in that portion each joint is furnished with a 

 small sharp tooth or spine ; club in the form of a short truncate 

 cone. 



ttyes with the upper division rather larger than the lower. 

 Thorax slightly villose. 



Abdomen rather shorter than the wings, marked with bright 

 colours ; that of the 3 slender, with a pair of claw-shaped cor- 

 neous appendices ; more robust in the $ . 



Legs with the spurs of the posterior tibia? nearly equalling the first 

 two tarsal joints. 



Hob. India. 



Species. 



I am unable to diagnose the forms in an intelligible manner. 

 It is evident that several species exist, presenting special charac- 

 ters in the appendices of the S , independently of general pecu- 

 liarities. As in several other genera, the males seem to be much 

 rarer than the females, or their habits cause them to be less fre- 

 quently captured; hence much difficulty arises. The followiDg 

 separation of described species will probably be found tolerably 

 correct. The wings, as in Acheron and Hyoris, certainly acquire 

 an amount of tinting varying according to the maturity of the 

 individual. 



1. G. dentifera, Westwood. (Ascal. (Ogcog.) dentifer, West. Cab. 

 Or. Ent.) 



I possess several examples from Bombay that are certainly re- 

 ferable to this species. 



2. G. incusans, Walker. (Ascal. incusans, Walk. Cat. Brit. Mus. 

 Neurop. p. 442, $ . — A. nugax, Walk. oj). ext. p. 433, $?) 



Hab. Ceylon. 



O. incusans is certainly distinct from dentifera. That nuga.v 

 may be the female of it is probable from the similarity of locality, 



