48 INSECTA. 
transverse square. The inferior side of the thighs is trenchant with 
a sulcus; the two anterior are furnished with a tooth, and the four 
posterior tibiz are narrow, arcuated, and somewhat dentated; the 
tarsi are glabrous *. 
The other Insects of this tribe, with similar legs in both sexes, 
differ from the preceding in their mentum, which occupies trans- 
versely the greater portion of the under part of the head, and has 
the form of a heart truncated inferiorly or at base. The thorax is 
always transversal, emarginate or concave before and arcuated late- 
rally, either trapezoidal and widest posteriorly, or strongly dilated 
laterally and narrowed towards the posterior angles. The labrum is 
emarginated. 
Most of these Insects are cinereous, and live on the ground in sandy 
localities. 
Sometimes the thorax is widened before, or near the middle of its 
sides, and narrowed posteriorly. The base of the jaws is exposed. 
In 
HerTerosce.ts, Lat., 
We observe two stout teeth on the outer side of the four first tibie, 
one in the middle, and the other terminal. The posterior extremity 
of the presternum is prolonged, laminiform, flattened, and received 
into an emargination of the mesosternum. ‘The body is oval, and 
rounded at both ends; the lateral edges of the thorax are strongly 
arcuated, and simply narrowed near the posterior angles. The an- 
tenne are slightly and gradually enlarged towards the extremity +. 
Macuta, Herbst. 
The antenne terminated by a little globuliform club composed of 
the three last joints; they can be received into cavities underneath 
the sides of the thorax, which are extremely thick and rounded f. 
In 
Scorinus, Airb., 
The antennz are also terminated by a little club, but in which the 
two last joints are almost confounded; they are not susceptible of 
being received into particular cavities. The thorax is dilated be- 
fore §. 
Sometimes the thorax is almost trapezoidal, gradually arcuated 
throughout the whole extent of its lateral edges, and is not abruptly 
narrowed posteriorly. The mentum covers the base of the maxilla. 
The two last joints of the antennze are united in a small club. 
Such are the 
—_—_—_—_——-,- sao; -—-——— nn 
* Blaps tibialis, Fab. 
+ Pimelia dentipes, Fab.; Platynotus reticulatus, ejusd. ;—Pimelia obscura, Oliv. ; 
Insects from the Cape of Good Hope. 
t{ Platynotus serratus, Fab. 
§ Scotinus crenicollis, Kirb., Lin. Trans. XII, xxi, 14, a subgenus peculiar to 
South America. 
7 
Lan 
