62 | RHOPALOCERA. 
mens only have as yet come under our notice, both of which were obtained at Rio Gatun 
on the line of the Panama railway by Herr Ribbe. One of these is in Dr. Staudinger’s 
collection, and one in our own. 
From the latter our figure and description are taken. 
Subfam. SATV RINE. 
CAROIS. 
Cerois, Hubner, Verz. bek. Schmett. p. 56 (1816) ; Doubl. & Hew. Gen. Diurn. Lep. ii. p. 366, 
t. Ixv. f. 1. (Type Papilio arcescilaus, Cr., =P. chorineus, Fab.) 
The type of this genus is a species peculiar to Guiana and the Amazon valley, 
which, probably on account of the state of atrophy of the front legs of the male, has 
been placed at the head of the Satyrine. These legs, owing to the rudimentary 
condition of the tibia and tarsus, are very similar to those of Jthomia and its near 
allies; and this fact perhaps justifies our making Cwrois stand here next to the Danaine ; 
but whether this position can be permanently assigned to it can only be determined by 
a more thorough examination of the Satyrine than we can here undertake. 
Besides the type, the only other species which has been placed in the genus Cwrois 
is the Papilio gertrudtus of Fabricius, of which we possess a mutilated example so 
determined by Mr. Butler after an examination of Jones’s drawings, the basis of 
Fabricius’s description. In the structure of the wings and front legs this specimen 
agrees with Cwrois; so that we have no reason to dissent from Mr. Butler’s decision. 
At the same time we cannot but regret that better materials are not forthcoming upon 
which to revise the question. 
1. Cerois gertrudtus. 
Papilio gertrudtus, Fabr. Ent. Syst. iii. p. 72+. 
Cerois gertrudtus, Butl. Cat. Fab. Diurn. Lep. p. 8’. 
Alis fuscis dimidio basali cyaneo lavatis, anticis macula subapicali fulva, ocello nigro albo pupillato ad apicem 
propius; subtus pallide ferrugineis, strigis obliquis ferrugineis quatuor, una ultra cellulam a costa anti- 
carum in posticas extendente, altera breviore intra cellulam aliisque duabus corpori propioribus, ad basin 
quoque ferrugineo irroratis ; alis posticis hujus speciminis imperfectis dimidio apicali omnino absente. 
Hab. Panama, Lion Hill (M‘Leannan). 
The determination of the only specimen we possess of this species is due to 
Mr. Butler, who refers it without hesitation to this Fabrician species2. Unfortunately 
this example is but a fragment, possessing, however, many of the characters ascribed 
to the species by Fabricius, but differing in having a purple blush over both wings, a 
character not noticed in the original description. As our example is a male, the 
female may want this peculiarity and thus conform to the Fabrician diagnosis. 
