314 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
THE THORAX. 
Notum. 
The pronotum (PI. XXXIII, fig. 6) is one-third longer than wide. 
The mesonotum (Fig. 7) is very long, though shorter than in Diaphero- 
mera. It is entire, with no signs of subdivision into the scutum, scutel- 
lum, &c. The presence of the small, net-veined, rudimentary fore wings 
has not affected or produced a differentiation of the notum, the insertion 
of the wings being very slightly marked. 
In the metanotum, owing to the long, large hind wings, with well 
developed muscular attachments, the notum is differentiated into two 
lateral swellings, which correspond to two halves of a scutum; while 
the scutellum is represented by a long, moderately broad area, rounded 
in front, and at the posterior end narrowed, and with a flattened, boss- 
like swelling. The scutellum is about one-half as wide as the entire 
notum, and on the sides it is not definitely separated from the sides of 
the notum. The hind edge of the notum is emarginate, forming il dis- 
tinct, rather full ridge extending across the notum. This may repre- 
sent the postseutellum; but most probably the next sclerite, which I at 
first took to be the first abdominal segment, is the postseutellum, as the 
next sclerite bears the first pair of spiracles. 
Pleurum. 
The pleurites are very much as described in Diapheromera, but the 
large, long episterna are shorter and broader than in Diapheromera, 
corresponding with the shorter and thicker proportions of the thorax. 
Sternum. 
The prosternum consists of two sclerites, as in Diapheromera. The 
mesosternum is shorter and broader, but otherwise exactly as in Diaphe- 
romera. The metasternum is much wider than in Diapheromera, with 
a narrow, intercoxal oblong area, as in Acrydii. 
THE ABDOMEN. 
The abdomen repeats that of Diapheromera; counting out the very 
large meta-postscutellum, there are eleven tergites and eight uroster- 
nites. The cercopoda are jointed, short, much as in Mantis. 
Note. — This genus connects the Pliasinida with the Acrydii, Prosco- 
pia being the connecting link in the latter family. 
Family ACEYDII. 
THE HEAD. 
Galoptenus spretus. The head, as in the other genera of Acrydii, is 
compressed so that the front is high and narrow. No signs of an occip- 
ital sclerite. In the epicranium the vertex, gen®, and clypeus are well 
developed. The epicranium extends below the middle of the front, but 
