ORTHOPTERA. 
311 
uium is divided into an occipito-vertical, square area extending from 
the occipital foramen and bending over to the ocelli, with a transverse 
straight suture or impressed line in front extending to the orbits. The 
clypeus is very distinctly divided into a post- and anteclypeus, the 
former wider than the anterior division. The labrurn is as long as broad 
and somewhat pointed in front. The geuse are broad, with a marked 
genal ridge. No gular region in front of the foramen. There is no sub- 
menturn; the mentum is square, the ligula small and narrow. 
THE THORAX. 
The thorax, as well as the rest of the body in general, approaches 
that of Blatta, with, of course, important modifications; in some respects 
it approaches the Acrydii. 
Notum. 
The pronotum (PI. XXXIII, figs. 1-3) is remarkably long, forming the- 
tergal and lateral portions of the area. On the anterior fourth is a 
transverse, impressed line, not, however, quite reaching the sides of the 
notum; this is situated directly over the insertion of the first pair of 
legs. 
Mesonotum. (Fig. 4, 5.) This is very long, being about twice as long 
as broad; along the middle extends a sclerite from the anterior to the 
posterior margin; it is triangular in front and behind; the anterior end 
we would regard as the prsescutum, and the posterior portion as the 
scutellum, the two uniting on the anterior part of the notum. There is 
no postscutellum developed. (This union of the prsescutum and scutel- 
lum is unique in Pbyloptera and Neuroptera, but there is an approach 
to it in Blatta.) 
On each side of the front of the notum, and in front of the insertion 
of the wings, is a distinct, triangular sclerite, the nature of which is uu- 
certain. 
The scutum is separated into two long halves. 
Metanotum. (Fig. 4, 5.) This is a little longer and slightly narrower 
posteriorly than the mesonotum, as the hind wings are nearly twice as 
wide as the anterior pair. 
The prsescutum is very distinct, narrow, triangular, truncate at the 
apex. The scutellum is very long and narrow, ending iu a long, very 
acute point before reaching the prsescutum; thus the scutum is divided 
into two long halves, connected by a very narrow bridge, situated, be- 
tween the prsescutum and scutellum, while the mesoscutum is entirely 
divided. The postscutellum is obsolete. 
Pleurum. 
Propleurites. (Fig. 1-3.) The episternum and epimerum are very 
small, short, rudimentary, and situated on the anterior fourth of the 
prothorax. 
