ON NEW AND LITTLE-KNOWN BUTTERFLIES. 375 



the wing paler than the rest of the surface composed of modified 

 scales. Undekside, both wings coloured as on the upperside. 

 Forewing with a broad dark ochreous fascia commencing on the 

 inner margin extending on to the disc, and just enclosing the 

 disc-like " male-mark " on its basal edge. Hindiving unmarked. 

 Cilia of both wings pale ochreous. Head, antennce^ palpi, body, 

 and legs dark brown. 



Described from two examples in my collection — one from Penang, 

 the other from N.-E. Sumatra ; the latter kindly sent to me by 

 Hofrath Dr. L. Martin, who has other specimens in his own collec- 

 tion. 



Genus IDMON, nov. 



Male. Foeewing, triangular, rather short ; costa nearly straight, 

 only slightly arched ; apex somewhat acute ; outer margin regularly 

 convex to the inner angle ; inner angle rounded ; inner margin 

 straight ; costal nervure short, ending just before the apex of the discoidal 

 cell; subcostal nervules arising at progressively decreasing distances apart; 

 discoidal cell narrow, rather short, not reaching to two-thirds the length 

 of the wing from the base ; upper disco-cellular nervule very short indeed, 

 practically obsolete, outwardly oblique ; middle and lower disco-cellular 

 very upright, slightly inwardly oblique only, both slightly concave, the 

 middle a very little longer than the lower ; second median nervule 

 arising close to the lower end of the cell ; first median arising a little 

 nearer to the base of the wing than to the lower end of the cell ; 

 submedian nervure straight ; a sexual brand placed anterior to but 

 against the submedian nervure towards its base, this brand is narrow 

 and raised. Hindwing, almost circular, as broad as it is long ; costa 

 much arched at the base, thence slightly arched to the apex ; outer 

 margin evenly rounded to the anal angle; anal angle rounded; abdominal 

 margin slightly convex ; costal nervure rather arched, ending at the 

 apex of the wing ; first subcostal nervule arising rather near to the 

 apex of the cell; disco-cellular nervules placed slightly obliquely 

 outwardly, very concave ; discoidal nervule wholly absent ; second 

 median nervule arising quite close to the lower end of the cell ; first 

 median arising much nearer to the lower end of the cell than to the 

 base of the wiDg ; submedian and internal nervures straight. Antenna 



