316 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
separated by an oblique suture from the sternum. The epimerum Is 
less regular in shape than in the mesopleurum, and is more oblique and a 
little curved. The trochantiues are large and longer than those of the 
two anterior pair of limbs. The coxae are but slightly developed. The 
trochanter is oblong, though longer than thick. 
In the Orthopteragenuina, Blatta excepted, the trochantiues and cox® 
are very small, owing to the large pleura and sterna. 
Sternum. 
The prosternum (PI. XXXI) is short in front, small, broad, triangular, 
with a scutellate expansion between the cox®, and a central, long, acute 
conical tubercle; behind, the sternum expands on each side behiud the 
legs, and is on the same plane as the inesosternum, but separated from 
it by a well-defined suture ; it extends far up on each side of the thorax. 
The mesosternum (PI. XXXII) is not so long as broad, but is large, not 
extending up above the insertion of the middle pair of legs ; the surface 
is a little convex ; the hinder edgo is excavated, a square portion of the 
metasternum being dovetailed into it. 
The metasternum (PI. XXXII) is wider and longer than the mesoster- 
nura, the sides extending up the thorax. The sternum is divided into 
four parts by sutures; the anterior part has just been described, the pos- 
terior is a piece nearly as long and a little wider than the first urosteruite, 
and sends a square portion corresponding to, but smaller than, the one 
on the mesosternum into the latter sclerite; the two lateral narrow parts 
lie next to the cox®. 
. THU ABDOMEN. 
There are ten uromeres (PJ. XXXIV-XXXVHI), represented by ten 
tergites, and seven urosteruites ; no pleurites are developed, the eight 
pairs of spiracles opening on the lower edge of the tergites. The tenth 
tergite is telson-like, with a triangular pleurite, on each side bearing the 
cercopoda, which are not jointed. The tenth tergite extends beyond the 
base of the upper pair of rhabdites. 
PROSCOPIA. 
THE HEAD. 
The high, vertical prolongation of the head in this remarkable insect 
is a development of the epicranium; the occipital region of the epieran- 
ium is also greatly produced, carrying the eyes and insertion of the anten- 
n® much beyond the middle of the head ; the space between the eyes is 
very narrow. The singular, fdur-angled process projecting above the in- 
sertion of the antenn® arises from the vertical rather than from the 
frontal region of the epicranium, as there is a long space between the 
insertion of the antenn® and eyes and the elypeus. The latter is very 
short and divided into post, and anteclypeus, though the two divisions 
are not separated by a distinct suture. The labrum is deeply hollowed 
out in front. 
