BUTTERFLIES FROM THE INDO-MALAYAN REGION, 395 



Burma, on 10th March, 1890, by Lieutenant E. Y. Watson, in whose 

 collection it is deposited. 



Genus SANCUS, nov. 

 Male and Female. Fore wing, elongated, narrow ; costa strongly- 

 arched at base, then almost straight to apex ; apex rather acute ; outer 

 margin convex ; inner margin slightly convex in the male, slightly 

 concave in the female ; costal nervure not reaching to opposite the apex 

 of the discoidal cell ; first subcostal nervule given off at about the middle 

 of the discoidal cell, strongly deflected upwards soon after its origin, 

 and touching the costal nervure for a little distance, ending on the 

 costa about opposite to the apex of the cell ; second subcostal origi- 

 nating a little nearer to the base of the third than to the base of the 

 first subcostal ; fourth subcostal originating half as near to the base 

 of the third as that nervule originates from the base of the second, 

 terminating at the apex of the wing ; subcostal nervure terminating on 

 the outer margin well below the apex ; discoidal cell narrow, long, 

 extending considerably beyond the middle of the wing ; upper disco- 

 cellular nervule short, strongly outwardly oblique ; middle and lower 

 disco-cellulars straight, strongly inwardly oblique, the middle a little 

 longer than the lower ; median nervules originating at nearly equal dis- 

 tances apart, the second long before the lower end of the cell, the first 

 at about the middle of the cell ; submedian nervure slightly sinuous. 

 " Male with a curious impressed elongated oval brand placed so 

 immediately behind as to touch the median nervure, and extending 

 for one-third of its length along the first median nervule " on the 

 underside of the wing. Hind wing with the costal, outer, and abdomi- 

 nal margins strongly arched ; costal nervure long, curved ; first 

 subcostal nervule originating a little before the apex of the discoidal 

 cell ; discoidal cell broad, rather short, not quite reaching to the middle 

 of the wing; upper disco- cellular nervule straight, inwardly oblique; 

 lower disco-cellular also straight, equal in length to the upper disco- 

 cellular, outwardly oblique ; discoidal nervule obsolete, can barely be 

 traced ; second median nervule originating a little before the lower 

 end of the cell ; first originating twice as far from second, as second 

 is from third ; submedian nervure straight ; internal nervure straight. 

 Type, the " Astictopterus " subfasciatus, Moore. 



The structure of the type species of this genus is very curious ; the 



