534 MR. H. W. BATES ON THE LEPIDOPTERA 



2. Napeogenes Tunantina. 



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. Napeo&enes Adelphe. 



6 $. 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. Tmiantina does. 

 It is peculiar to the forests of the Cupari, a l)ranch river of the Tapajos. All the 

 individuals found were constant to their type. 



4. Napeogenes Inachia, Hewitson. 



Ithomia Inachia, Hewits. Exot. Butt. Ithoinia, fig. 66 (not 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 antennae are entirely black. 

 The hind wing beneath wants the basal costal yellow spot which is so constant in 

 N. Cyrianassa and its local varieties. 



Eound 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. 



d 2 . Size, shape, and colour of antennge 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 

 win"- (with their nervures) are straw-coloured and semitransparent. The submarginal 



* Fig. 67 is given by Mr. Hewitson as a variety of Inachia. It differs only in colour, and is without a doubt a local 

 variety o{ Inachia. It occurs abundantly at Bahia, where it seems to mimic Ithomia Euritaa of that region. It 

 should have a distinctive name for the sake of clearness ; I propose that of iV. siilphiirina. 



