294 RHOPALOCERA. 
P. otolais is a common species throughout our region, where individuals are very 
constant in their markings. 
Mr. Bates says? he met with it only at San Paulo on the Upper Amazons, and 
remarks that the single specimen he captured there differed slightly from Mexican 
and Guatemalan insects. We have since received others from Mr. Whitely, taken at 
Pebas and various places on the upper waters of the Amazons, all showing similar 
differences. A specimen likewise was sent us by Dr. Felder, who received it from 
Bogota and marked it ‘“‘ P. otolais, var.” 
The chief points of divergence from the northern form are the presence of a pair of 
whitish spots near the centre of the outer margin of the primaries, and the rather 
broader and paler red markings on the underside ; but we hesitate to place a specific 
value on such slight characters, and are content to indicate the points of variation. 
Regarding P. neis, Felder, we have no hesitation in considering it the same as 
P. otolais; not only does the description agree, but the range indicated of P. neis is 
nearly identical with that of P. otolats. 
One of our Guatemalan specimens is figured. 
ADELPHA. 
Adelpha, Hiibner, Verz. bek. Schmett. p. 42 (1816). 
Heterochroa, Boisd. Sp. Gén. i. t. 8. f. 4; Westw. Gen. Diurn. Lep. p. 276. 
This large, almost exclusively Neotropical genus contains upwards of seventy species, 
of which no less than thirty-one are found within our fauna, one only of which, the 
aberrant Adelpha bredowi, passes northwards across the frontier of Mexico, where a 
closely allied species, A. californica, is also found. In South America Adelpha does 
not pass beyond the limits of Brazil and Bolivia; it is more strongly represented in 
the eastern slopes of the Andes than elsewhere, though Mr. Bates found thirteen species 
during his sojourn in the valley of the Amazons. 
Regarding the position of A. bredow?, we have some doubts whether it ought not to 
be removed from Adelpha on account of its smooth eyes and other characters. Though 
the former feature associates it with Limenitis as usually understood, the latter, such as 
secondary male organs, point rather to an independent position. As for Limenitis 
itself it certainly requires revision, as the type of the genus, L. populi, has many points 
of difference from L. camilla, and there are Indian species with hairy eyes that require 
careful dissection before their position can be settled. On the whole, therefore, we 
think it best to leave A. bredowi in Adelpha, at the same time drawing attention to its 
peculiarities, to be of service when the whole group is recast. 
Prof. Westwood, in his note on the genus, speaks of its affinity to Apatura; but this 
view, we think, can hardly be maintained, Apatura having several peculiar characters 
not shared by Adelpha. | 
