ORTHOPTEB.A. 
313 
much developed posteriorly towards the occipital region, being reduced 
to a minimum in front of the antennae. The clypeus is very short, undi- 
vided, and the labium is deeply cleft. There is no genal ridge. The 
gula is rather broad. The submentum and mentum are rather small 
and narrow. 
THE THORAX. 
Notum. 
The pronotum (PI. XXVIII) is oblong, quadrangular, about twice as 
long as broad. 
The mesonotum (PI. XXX) and metanotum are remarkably long and 
slender, the mesothorax being a little longer than the metathorax, and 
not differentiated, owing to the want of wings. 
Pleurum. 
The propleurum. (PI. XXIX.) There are three sclerites on the sides — 
minute, short, and rudimentary ; the anterior is the episternum ; the 
middle the epimerum ; and the third and liindermost is the peritreme, 
bearing the first thoracic stigma ; the second pair of stigmata being at 
the end of the mesopleurum. The coxa is large, cylindrical (a vertical 
suture along the outer side shows that it is made up of the coxa and 
trocliantine ?). 
The mesopleurum (PI. XXXI) is as in the propleurum, but the epister- 
num, as we are disposed to regard it, is larger and extends along, form- 
ing a long, very narrow lateral strip, reaching to the prothorax. 
The met apleurum (PI. XXXI) exactly repeats the form of the mesopleu- 
rum, the episternum in front beiug somewhat narrower and ending at 
the mesostigma. 
Sternum. 
The prosternum (PI. XXXI) is subscutellate, rapidly narrowing iu 
front of the insertion of the legs. 
The mesosternum (PI. XXXII) is very long, with a separate piece which 
we may call the praisternite, and which is narrow and crescent-shaped. 
The metasternum (PI. XXXII) is as in the mesosternum, but the prae- 
sternite is much smaller. 
THE ABDOMEN. 
There are ten tergites and a rudimentary eleventh. There are nine 
urosternites. The pleurites are more developed in the 9 than in the <5 . 
THE HEAD. 
Prisopus. m (Plate XXXIII, figs. 6-9.) The head is as in Diaphero- 
mera ; the epicranium and clypeus are as described under that genus, 
but the labrum is less deeply cleft. 
161 A common Brazilian apeoiea. 
