286 INSECTA. 
spine or bristle, which passes into a hook on the under surface of the 
superior wings, maintaining them, when at rest, in a horizontal or 
inclined position*, This character is also visible in the ensuing 
family, but the Crepuscularia are distinguished from the latter by their 
antennz, which form an elongated club, either prismatic or fusiform. 
The caterpillars have always sixteen feet. The chrysalides are 
destitute of the points or angles observed-in most of those of the 
Diurnal Lepidoptera, and are usually enclosed in a cocoon, or con- 
cealed either in the earth or under some body. These Lepidoptera 
frequently appear only in the morning or evening. 
They compose the genus, 
Spuinx, Lin.—Papittons-Bourpons, De Geer, 
So named from the attitude of several of the caterpillars, which 
resembles that of the fabled monster so called. ‘They have received 
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 Sphina, of Fabricius, and to 
those which he first called Sesia and Zygena. 
The first, or that of the Hesprri-SpuineEs f, consists of Lepidop- 
tera, which evidently connect the Hesperize 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 antennee 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 antennze are simple, gradually thickened near the middle, 
and then become narrowed and terminate in an elongated hook, 
form the subgenus 
Acarista, Leacht. 
Those, in which the inferior palpi are similarly formed, but where 
* In certain Smerinthi, however, according to Godart, they are wanting. 
+ Inethis section, at least for the present, I will arrange the genus HecaTesia, 
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 Europcorum Lepidopterorum Index Methodicus. He thus charac- 
terizes the above genus: antennz 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. fenestraia, is found in New 
Holland. 
+t See Encyc. Méthod., article Papillon, genus Agariste. Near this genus comes 
