78 MALACODERMATA. 
The figure represents a female specimen from Guanajuato. 
Head black, moderately elongate; antenne of the male nearly as long as the body ; 
the head at their insertion has a yellow ring, but not completed in front. Thorax 
quadrate, but narrowed towards the front, the entire margin reflexed, more distinctly 
at the base and sides, and yellow, the base usually very narrowly so; disk opaque, with 
a square shallow impression behind. Scutellum black, the apex sometimes yellow. 
Elytra variable, sometimes fuscous black, with the shoulders. as far as the middle, and 
the margin for two thirds, yellow, or with the suture broadly black near the scutellum, 
narrowing to a point before or near the middle, where an apical spot commences, leaving 
only the suture and margin narrowly yellow, the apex more widely so. The ventral 
plates are yellow, spotted or banded with black at the base. The apical convex 
segment in the male is black. 
This appears to be one of the commonest species, at least in those localities where it 
occurs in Mexico and Guatemala. It is represented in Texas by C. lambatus, Leconte, 
from which it differs in its average larger size, the abdomen spotted or ringed with 
black, &c. Out of a very large series of C. hastatus which I have seen there is none 
with a quite yellow base to the abdomen, as my exponent of C. limbatus has. 
Subfam. THZLEPHORINT. 
DISCODON. 
Unguiculi externi maris fissi. Caput postice constrictum ; oculi mediocres, subglobosi, prominentes ; antennarum 
articulus secundus tertio multo brevior. Prothorax margine haud integro, maris lateraliter minute 
inciso, feminze ante angulos posticos sinuato-emarginato. Abdominis segmentum ventrale apicale maris 
bilobatum, subapicale angulariter emarginatum ; pygidium convexum. 
This genus is allied to Podabrus in the form of the head and in the general appear- 
ance; but the notching of the sides of the thorax is a character I have not seen in any 
species of that genus, and, taken with the division of the apical segment of the male, 
indicates some affinity with the Silini. The notch is very small, and is not situated in 
the same position in the different species: in D. erosum it is below the middle, and 
viewed from above appears only as a small indentation in the acute edge of the margin ; 
but in D. plicatum the notch appears to be due to the flattening and extension of the 
margin where it commences to be slightly reflexed in front. 
The apical segment of the abdomen of the male is also very different in structure from 
that of Podabrus and Telephorus. This plate, which appears to be the seventh, is 
divided for its whole length, thus having two lobes slightly inclined to each other, the 
segment preceding it being angularly gable-shaped and cut out. The fission of the 
claw is analogous to that of Podabrus; but it is here only the external claw, and that 
only in the males, that is divided. 
