OF THE AMAZON VALLEY. 537 



in the same country. Mr. Hewitson, in the text, has called attention to the close 

 resemblance, stating that he had been incUned to refer them to the same species. 



3. N. Apulia, Hewits. 1. c. Itlwmia, fig. 127. 



New Granada. This species, different in style of coloration from any Heliconide found 

 in the Amazon region, affords another instance of the strange adaptive resemblances 

 existing ui this genus. It mimics a small group of Ceratinice which are also peculiar to 

 New Granada, namely, C. (or Jlelincea ?) Villula (Hewits. Exot. Butt. Ithomia, fig. 126) 

 and C. Cceno {lb. fig. 84). 



4, N. Xanthone, n. sp. 



<?. Expanse 2". Belongs to our first section, and is probably another local form of 

 N. Inachia. Wings elongate-narrow. Fore toing : above, with the black borders and 

 crossbelt arranged as in N. Inachia, except that the crossbelt is much more oblique, com- 

 mencing nearer the base of the wing ; basal area opake bright fulvous ; the crossbelt very 

 broad on the costa, then narrower, but continuing of equal breadth from the cell to the 

 outer margin ; subapical spot oblong-oval, bright clear yeUow ; outer margin spotless. 

 beneath, the same, except that there is a submarginal row of seven white spots. 



Sind loiiig : above, with outer margin from before the end of the costa to the anal angle 

 broadly black, enclosing an orange-coloured stripe; discal area bright clear yellow. 

 Beneath, the same, except that the basal part of the costa is yellow, and that there is a 

 black stripe along the subcostal nervure, and a submarginal row of six white spots. 

 Body dark grey ; collar and wing-lappets orange-coloured. Antennae black, 

 Bahia and S. E. Brazil. It somewhat resembles in its general colours Mechaniiis 

 Nescea, a prolific species peculiar also to the same part of Brazil. 



5. N. SULPHURINA, nob. Ithomia Inachia, var., Hewits. Exot. Butt. Ithomia, fig. 67. 

 Bahia. 



Genus Ithomia, Doubleday. 

 Doubld. and Hewits. Gen. Diurn. Lep. p. 122. 



I propose to limit this genus to those species in which the hind-wing disco-cellular 

 nervule is placed so as to form a right or acute angle with the median nervure, and is 

 directed across the wing (instead of towards the apex) in both sexes. The head and j)alpi 

 are constructed precisely as in Ceratinia, Sais, Mechanitis, and Napeogenes. The antennae 

 are long, and thickened towards the tips ; sometimes they are excessively elongated and 

 filiform. Even when thus limited, the genus contains a considerable diversity of forms, 

 constituting groups which perhaps have an equal right with Ceratinia and Napeogenes to 

 be called genera. The chief groups are the three following : — 



1. Ithomia proper. 

 The hind-wing lower radial is visible on the disk, and terminates on the hind margin, 

 the median branches not being widely separated. There is a long middle disco-cellular 

 nervule which is directed obliquely outwards. The arrangement of the upper radial and 



4c2 



