NAPEOGENES. 27 
Of this species we have only seen four examples—one (a male) in the collection of 
Dr. Staudinger, another (a female) in our own, and two in the Vienna Museum. Our 
specimen is figured on Plate III. fig. 3. All these were taken on the line of the Panama 
Railway. The nearest ally of VV. hemimelena is N. peridia (Hew.), of Colombia, from 
which it differs in having the two inner series of yellow spots in the apex of the pri- 
maries blended into one large one, and in the almost total absence of the large yellow 
spots in the apical angle of the secondaries. 
2. Napeogenes tolosa. (Tab. II. fig. 1, & Tab. III. fig. 4.) 
Ithomia tolosa, Hew. Ex. Butt., Ith. t. xii. f. 72°. 
Napeogenes tolosa, Butl. & Druce, P. Z. 8. 1874, p. 3347. 
Alis fulvis, anticarum costa et dimidio apicali nigris, hoc maculis quinque flavis notato, una discali subquadrata, 
reliquis in area apicali positis ; margine externo serie punctorum alborum notato; posticis nigro marginatis : 
subtus ut supra, sed alis pallidioribus, marginibus externis punctis albis notatis. 
Hab. Mexico!; Guatremaua, Polochic valley (H. Hague); San Satvapor (Mus. Stau- 
dinger); Nicaragua, Chontales (Belt, Janson); Costa Rica (Van Patten?), Trazu 
(Rogers); Panama, Chiriqui and Veraguas (Arcé). 
The typical specimen of this species came from Mexico; but we have never yet met 
with it in collections from that country. In Guatemala it must be very rare, as a single 
specimen only has reached us; and this was taken in the valley of the Rio Polochic by one 
of Mr. Hague’s collectors. For the sight of a male specimen from San Salvador we are 
indebted to the kindness of Dr. Staudinger. This we have represented on Plate II. 
fig.1. The presence of yellow spots at the apical angle of the secondaries in this example 
makes us doubt the accuracy of the determination of the sex of Hewitson’s specimen, 
which we believe to be a female, and not a male as there stated!. Nicaraguan examples, 
and all from more southern localities, depart somewhat from the northern type. The 
primaries of these have the fulvous of the basal portion more restricted, in some speci- 
mens the base of these wings being wholly black. The spots, too, of the apex are 
usually of smaller size. As very considerable variation exists between individuals from 
these southern localities, and as some almost exactly resemble our Guatemalan example, 
we cannot separate them asa distinct race, though differentiation has proceeded to a 
considerable extent. Our figure on Plate III. tig. 4, represents a male of the Nicaraguan 
form. Though doubtless rare in the northern parts of Central America, it must be 
common in Nicaragua, judging from the number of specimens sent from that country 
from time to time. The pattern of Mechanitis isthmia is that which this species affects 
in the countries where both species are found. 
E2 
