534 MR. H. W 
2. Napeogenes Tttnantina. 
2 . Size, shape, and general colour of N. Cyrianassa. Apical yellow spot of the fore 
wing oval in shape, rounded on its inner edge, sinuated in the middle, leaving the dusky 
crossbelt of undiminished thickness to the outer margin. Disk of the hind wing semi- 
opake, fulvous. The rest as in N. Cyrianassa. 
Found in the forest at Tunantins, north shore of the Upper Amazons. All the 
individuals seen were conformable to the above description. 
3. Napeogenes Adelphe. 
6 2. Size, shape, and general colour of N. Cyrianassa. The wings are throughout 
more opake. The apical yellow spot of the fore wing is oblong, of nearly uniform width ; 
its inner margin has two slight sinuations : the black transverse belt between it and the 
disk commences at the subcostal nervure, and is gradually attenuated to its termination 
on the outer margin. 
This constant local form differs from N. Cyrianassa more than N. Tunantina does. 
It is peculiar to the forests of the Cupari, a branch river of the Tapajos. All the 
individuals found were constant to their type. 
4. Napeogenes Inachia, Hewitson. 
67) 
This species closely resembles N. Cyrianassa in form and colours. The basal part of 
the fore wing, however, has a rather larger extent of yellowish hyaline ; the subapical 
spot is regularly oblong oval, and the black crossbelt is gradually narrowed, its edges 
being straight, from the costa to the outer margin. The antennas are entirely black. 
The hind wing beneath wants the basal costal yellow spot which is so constant in 
N. Cyrianassa and its local varieties. 
Found in company with N. Cyrianassa at Para. Although the two species are so 
closely allied and fly together, they appear to maintain themselves perfectly distinct. 
Nothing resembling a hybrid example or connecting form ever occurred. I strongly 
suspect that we have here a case of mimetic adaptation ; because most of the numerous 
local varieties of N. Inachia are modified to represent species of Ithomia occurring in the 
same localities. 
5. Napeogenes Pyrois. 
<S 2 . Size, shape, and colour of antennae of N. Inachia. The subapical yellow spot of 
the fore wing, and its accompanying black crossbelt, as well as the broad fulvous border 
of the hind wing, are also precisely the same. The ground-colour of the wings, however, 
is quite different. The basal area of the fore wing and the discal portion of the hind 
wing (with their nervures) are straw-coloured and semitransparent. The submarginal 
* 
Hewitson as a variety 
without 
variety of Inachia. It occurs abundantly at Bahia, where it seems to mimic 
should have a distinctive name for the sake of clearness ; I propose that of 2V, 
It 
