130 RHOPALOCERA. 
is just as in O. tamarindi and in all the other Central-American Opsiphanes, except 
O. xanthicles described below. Though the male resembles that of 0. xanthus in many 
respects, the female is quite different; so that O. orgetoriz has no near ally that we 
know of. 
d. Body slender; secondaries rounded ; no pencil of hair in the cell of the secondaries 
near the origin of the first median branch, but a pencil in front of the pre- 
discoidal cell. 
9. Opsiphanes xanthicles, sp.n. (Opsiphanes xanthus, Tab. XII. figg. 1, 2.) 
Alis fuscis, anticis fascia arcuata a costa ad angulum analem fulva, maculis apicalibus albis; posticis unico- 
loribus, maculis obsoletis fulvis apud angulum apicalem; subtus obscure brunneis albo (nisi anticarum 
dimidio basali lineis nigris notato, et fascia posticarum transversa) irroratis, ocello distincto apud 
anticarum apicem et duobus parvis (uno costam posticarum attingente, altero ad angulum analem) notatis. 
@ adhuc ignota. 
Hab. Panama, Chiriqui and Veraguas (Arcé).—UPPER AMAZONS. 
This species has a very close general resemblance to 0. zanthus, so much so that for 
some time we considered that it ought to bear that name. Having now obtained a 
specimen of the true O. zanthus from British Guiana, agreeing well with the figure in 
Clerk’s ‘Icones Insectorum,’ the basis of Linneus’s description, we are able to detect 
important differences in the present species. 
The true O. canthus has a pencil of hairs in the cell, just as in most Opsiphanes, 
whereas in O. vanthicles this pencil is wholly absent. The long patch of transverse hair 
so prominent in O. xanthus is here much reduced. These differences (and there are 
others) at once serve to distinguish the two species. Indeed O. xanthicles, so far as we 
know at present, stands alone in not having the pencil of hairs in the cell near the 
origin of the first median branch. 
Besides our Central-American examples we have others from the Upper Amazons, 
one taken by Mr. Bates at Ega, and another by Hauxwell at Pebas; so that O. xanthicles 
enjoys a wide range. 
We have figured one of the Panama specimens. 
CALIGO. 
Caligo, Hiibner, Verz. bek. Schmett. p. 51 (1816) ; Westw. Gen. Diurn. Lep. p. 340. 
This genus contains the largest Butterflies of the South-American fauna. Excluding 
the members of the next genus (Eryphanis), some twenty species are now known, of 
which seven are found in Central America. Of these only one, C. wranus, can claim to 
be peculiar to the region. The rest are all found in South America, some of them (such | 
as C. ewrylochus and C. ilioneus) having an exceedingly wide range. Southern Mexico is 
the northern limit of the genus, where three species (C. uranus, C. otleus, and C. memnon) 
