74 MALACODERMATA. 
Head with the eyes very prominent, not much produced, but constricted behind ; 
antenne frequently as long as the body. Thorax with three impressions—two lateral, 
one in the centre near the base, divided by a short and somewhat obsolete keel ; it is 
more quadrate than in C. easanguis, which it otherwise very much resembles. The 
elytra nearly conceal the wings; they have rarely any trace of black at their bases. 
The valvular plate in the male is often fuscescent, but only faintly so. In one specimen 
only the whole thorax is fuscous. 
18. Chauliognathus exsanguis. 
Pallide testaceus ; antennis palpis et ore nigris, tibiis et tarsis plus minusve infuscatis. Long. 10-11 millim. 
Hab. Guatemata, Cubilguitz, Lanquin, Panima, Panzos (Champion). 
Smaller than C. fuscescens, and with the elytra more abbreviated ; the thorax is also 
narrower and not uneven, although there are faint indications of a basal depression. 
The legs are paler, in some examples only showing a tendency to become fuscous. The 
antenne hardly exceed half the body’s length. 
19. Chauliognathus lituratus. 
Pallide testaceus vel sordide fuscus ; capite et thorace nigro-signatis ; antennis, genibus, tibiis tarsisque fuscis ; 
elytris abbreviatis. Long. 10 millim. 
Hab. Mexico, Panistlahuca, Toxpam, Cordova (Sallé); Nicaraeua, Chontales (Belt). 
Very variable in colour, either pale dirty yellow or fuscous, with paler margins to 
the elytra. The head is pale, more or less spotted or clouded with fuscous at the base 
or between the eyes. The thorax has sometimes a transverse irregular mark formed of 
several smaller united spots, or is quite yellow, or has a horseshoe mark. The knees 
and tibiee, with the tarsi, seem constantly infuscate. The elytra are shortened so as to 
leave about one quarter of the abdomen uncovered. 
20. Chauliognathus nigriceps. 
Flavus, opacus ; capite subnitido nigro, epistomate flavo-maculato, antennis, pedibus, abdominis segmento ultimo 
maris ventrali, dorsalibus utriusque sexus et scutello nigris; alis fuscis; elytris abbreviatis, postice acumi- 
natis. Long. 10 millim. ¢ 9. 
Var. elytris nigro marginatis. 
Hab. Mxxico, Cordova (Sallé); British Honpvuras, river Sarstoon (Blancaneaua) ; 
GuATEMALA, Sinanja valley, Senahu (Champion). 
This is very distinct from C. lituratus by the black head and scutellum. The side 
of the head in front of the eye is pale yellow; and the mandibles are of this colour at 
their base. The thorax is quadrate and rather smooth, the hind margin narrowly 
raised. The coxe are black externally, but yellow on their internal side. 
The variety with the elytra margined with black laterally is a male, and has the 
valvular plate black. It is from Mexico. 
