318 REPORT UNITED STATES ENTOMOLOGICAL COMMISSION. 
thorax and met-entothorax are conspicuous and situated between the 
second and third j>air of legs. 
(Jonocephalus. In the head of this genus the entire epi cranium is pro- 
duced tergally into a long cone, with no suture above. Beneath, there is 
a deep inter-antennal fossa dividing the cone from the face, which is 
longer than broad. There are no ocelli. There is no suture between 
the clypeus and epicranium, except on the sides. 
Family LOCUSTARIvE. 
THE HEAD. 
Anabrus. (PI. XXY-XXYI). The epicranium is very large, and di- 
vided into two portions, post- and ante-antennal, which are separated by 
a short interantennal suture. The front of the head is very broad, and 
the eyes are small. There is an occipital ridge on the hinder edge, 
separating the gen® from the ocular region. The clypeus is trapezoidal, 
about one-half as long as wide, with an accessory, rounded, anterior ex- 
pansion on the base of the labrum; the latter rounded, as long as broad. 
The gen® are broad and flat; the gula moderately broad. 
THE THORAX. 
Notum. 
The pronotum (PI. XXVIII) is very large, extending down to the in- 
sertion of the fore legs and backward to the base of the abdomen. 
Mcsonotum. (PI. XXX.) The scutum and scutellum are only partially 
differentiated, the scutal area being represented by two lateral, flattened, 
slightly-marked bosses on each side of the segment in front, and not 
separated by suture from the scutellum, whose apex is distinct and acute. 
There is no pr®scutum or postscutellum. 
The metanotum (PI. XXX) repeats the general features of the rneso- 
noturn, but the segment is a little shorter, the scutal bosses smaller, while 
the scutellum is indicated by a circular, flattened eminence, with no apex 
behind. The postscutellum is not indicated. 
Fleurum. 
The propleurites (PI. XXIX) are small and short. There are two epi- 
sternal sclerites, an upper and lower, of irregular form. The epimerum 
js undivided; it is no longer than broad, and below laterally flares out- 
ward, forming a horizontally-projecting scale. The prostigmata are very 
large, and the edges are armed within by thick-set spines. 
The tnesopleurites and metapleurites are much alike and peculiar in 
form, being large and high, owing to the small wings. The episternum 
is long and narrow, and vertical in position ; it is undivided, and a little 
narrower above than near the sternum, the middle beiug produced into 
a sharp ridge. The epimerum is as in the episternum, but flatter and 
only ridged near the sternum. 
The metapleurites are more oblique than the mesopleurites, and are 
