188 INSECTA. 
that of Papillons-Bourdons from the humming noise they frequently 
produce while on the wing. 
I will divide this subgenus into four sections, corresponding in a 
similar order to the genera Castnia and Sphing of Fabricius, and 
to those which he first called Sesia and Zygena. 
The first, or that of the Hesprri-SpnincEs(}), consists of Lepidop- 
tera, which evidently connect the Hesperiz with Sphinx proper. 
The antenne are always simple, thickened in the middle or at the 
extremity which forms a hook, narrowed into a point at the end, and 
without a tuft of scales. They all have a very distinct proboscis; 
the inferior palpi are composed of three very apparent joints. In 
some, the second is elongated and strongly compressed, the third 
slender, almost cylindrical and nearly naked; these palpi resemble 
those of the Uraniz; in others, they are shorter but wider, almost 
cylindrical, and well furnished with scales. The antenne of the 
latter are only inflated at the extremity. 
Those, in which the inferior palpi are elongated, with the second 
joint strongly compressed, and the last slender and almost naked, in 
which the antennz are simple, gradually thickened near the mid- 
dle, and then become narrowed and terminate in an elongated hook, 
form the subgenus 
Acarista, Leach(2). 
Those, in which the inferior palpi are similarly formed, but where 
the antenne are terminated abruptly in a club with a short terminal 
hook, compose the subgenus 
Coronts, Lat.(3) 
(1) In this section, at least for the present, I will arrange the genus Hzcaresra, 
established by M. Bois-Duval, in his lately published interesting Monograph, with 
which he terminates the first part of another work, that will be highly useful to 
amateurs, entitled Europxorum Lepidopterorum Index Methodicus. He thus cha- 
racterizes the above genus: antenne rough and fusiform, as in Nymphalis, the 
joints distinct to the club; palpi densely pilose, with indistinct joints, and not 
extending beyond the clypeus; proboscis corneous and rolled up spirally; thorax 
very hairy; wings laid onthe body. The only species known, the H. fenestrata, 
is found in New Holland. 
(2) See Encyc. Méthod., article Papillon, genus Agariste. Near this genus 
comes that of Cocytia of M: Bois-Duval; the wings are marked with square trans- 
parent spots, a character which seems to approximate them to Sesia; but the palpi 
are those of Urania, and the antennz are as in Agarista. 
(S) Founded on a species from Brazil, now in the cabinet of Count Dejean, and 
which I believe is undescribed. 
