DIDUGA. — SCHISTOPIILEPS. 
53 
third of costa from base black ; cilia oclireous, dark brown in places. Hind wing greyish 
brown. Antennse^ head, and collar ochreous ; thorax and abdomen brown. Underside 
smoky brown ; apex of fore wing narrowly ochreous. 
Near D. costata, Moore ; the bauds narrower and differently shaped. 
Diduga albicosta. (Plate CXL. fig. 17.) 
Expanse \ inch. 
Female. Fore wing violaceous grey ; a white costal band, constricted near the middle and 
towards the apex, where it is slightly ochreous ; two small white triangular patches on the 
outer margin, one between the discoidal nervules, the other at the first median nervule, and 
continued as a narrow line to the outer angle. Hind wing paler grey. Cilia of fore wing, 
antennae, head, and collar white ; thorax and abdomen grey. Underside grey ; the apical 
half of costa narrowly ochreous. 
Near D. costata and D. fidvicosta. 
COSTARCHA, gen. nov. 
Antennee of male bipectinated at somewhat wide intervals : palpi weak, directed 
downwards. Fore wing ample; sparsely covered with scales; pointed at apex; the costa 
highly arched near the base and towards the apex ; outer margin nearly straight. Hind 
wing very ample. 
Costarcha indistincta. (Plate CXL. fig. 22.) 
Expanse |-1 inch. 
Male. Fore wing grey, with scattered dark scales ; five dark bands from costa to 
subcostal nervure at regular intervals, the second extending across the cell; two parallel 
series of indistinct small spots from beyond the lower end of the cell to the inner margin ; a 
waved submarginal line ; a series of antecilial spots. Hind wing paler, with an indistinct 
spot at middle, and another at end of cell. Antennae, head, thorax, and abdomen grey. 
SCHISTOPHLEPS, gen. nov. 
Wings almost denuded of scales. Fore wing : costa and inner margins arched ; outer 
margin nearly straight ; costal nervure with three short branches from it to costa ; first and 
second subcostals anastomosed at origin, as also are the second and third, which are given off 
just before the end of the cell. Hind wing ample; costa nearly straight. Antennae with 
the basal joint thickened, but not so long as in Homopsyche, to which this genus is allied. 
