4 INSECTA. 
In those which compose the first, all the Jegs are similar, 
and only adapted for running,—they are the Cursoria or run- 
ners. In those which constitute the second, the posterior pair 
of thighs are much larger than the others, thereby enabling 
them to leap. Beside this, the males produce a sharp or stri- 
dulous noise—they are the Sa/fatoria or jumpers. 
FAMILY I. 
CURSORIA. 
In this family the posterior legs, as well as the others, are 
solely adapted for running. 
Almost all these Insects have their elytra and wings laid 
horizontally on the body; the females are destitute of a cor- 
neous ovipositor. 
They form three genera: in the first or the 
Forricu.a, Lin. 
There are three joints in the tarsis the wings are plaited like a 
fan, and folded transversely under very short and crustaceous elytra 
with a straight suture; the body is linear, with two large, squamous, 
mobile pieces, which form a forceps at its posterior extremity. 
The head is exposed. 
The antennz are filiform, inserted before the eyes, and composed 
of from twelve to thirty joints, according to the species. The galea 
is slender, elongated, and almost cylindrical. The ligula is forked. 
The thorax in the form of a scale. 
The researches of MM. Randohr, Posselt, Marcel de Serres, and 
those of M. Leon Dufour in particular, have unveiled to us the in- 
ternal organization of these Insects. The latter gentleman has dis- 
covered two salivary glands, each consisting in a vesicle, more or 
less ellipsoidal, situated in the prothorax or thorax, terminated pos- 
teriorly by an extremely tenuous thread, and anteriorly by a tubular, 
capillary neck, which is slightly inflated near the pharynx, and’ then 
unites with the corresponding portion of the other gland to form 
a common trunk opening into the mouth. 
The digestive canal consists of an esophagus, a large elongated 
crop, and of a short gizzard furnished internally for trituration, with 
