DIDUGA. — SCHISTOPHLEPS. 53 



third of costa from base black ; cilia ochreouSj dark brown in jjlaces. Hind wing greyish 

 brown. AntennsBj head, and collar ochreous ; thorax and abdomen brown. Underside 

 smoky brown ; apex of fore wing narrowly ochreous. 



Near D. costata, Moore ; the bands 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 j thorax and abdomen grey. Underside grey; the apical 

 half of costa narrowly ochreous. 



Near D. costata and D. fulvicosta. 



COSTAECHA, gen. nov. 



Antennse of male bipeetinated 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 veiy 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. 



