i ¢ 
LEPIDOPTEROUS INSECTS. 13 
I. The two anterior feet shorter than the others, folded, not 
ambulatory, in both sexes, or in the males only ; chrysalis 
fixed by its posterior extremity, and suspended with the head 
downwards ; central areola of the lower wings open poste- 
riorly in many species. 
A, The central areola of the lower wings is always posteriorly 
closed ; the two anterior fect, although small and folded, very 
similar to the others ; the lower wings in general scarcely 
embracing the abdomen below ; labial palpi slightly elevated 
above the hood, much separated, slender, cylindrical. 
The genera are Danaus, Ipra, Hexrcontus, and Acrea. 
B. Central areola of the lower wings open in many species ; 
two anterior feet often minute and concealed, or apparent 
and very hairy ; lower wings embracing the abdomen below ; 
labial palpi rising above the hood, slender and cylindrical, 
and not distant. 
a, Central areola of the lower wings open posteriorly. 
* The labial palpi are either separated through their whole 
length, or merely at their extremity, and abruptly terminated 
by a slender and a circular joint. 
2. Perlata. 
The genera are Cernosia and Ancynnis. 
“© The inferior palpi are contiguous through all their extent, 
and not terminated abruptly by a slender and acicular joint. 
++ The antenne are terminated in a small club, in the form of 
a button, short, turbinated, or ovoid ; caterpillar thickly 
beset with spines. 
Contains one genus, Vanessa. 
++ Antenne terminated in an clongated club, or nearly fili- 
form; caterpillar naked or slightly spinous, with the poste- 
rior extremity terminated in a bifid point. 
The genera are Linytuca, Bistis, Nympnacis, and 
Moreno. 
