336 NITIDULID. 
varieties of which it is also extremely similar. The scutellum is almost truncate behind. 
The structure of the mesosternum and the metasternum in the middle is similar to that 
of the other species of this group, the former having a carina not broadened at the base, 
and the latter being depressed and rather finely margined. The females in this group 
may be mistaken for males owing to the last ventral segment having a depressed 
margin behind ; and in the female of C. solitarius the resemblance to a male is increased 
by there being some elongate pubescence in the middle of this margin. 
23. Camptodes melanopterus, sp. n. 
Rotundatus, convexus, dilute rufus, elytris nigerrimis ; antennarum clava lata, nigricante, apice ferrugineo. 
Long. 5-52 millim. 
Mas. Supra opacus. 
Fem. Supra nitida. 
Hab. Mexico, Acapulco in Guerrero (Hége). 
This insect differs from C. transversus and C. jucundus in the form of the scutellum, 
the latter being of normal shape, instead of having the sides subangulate and the apex 
obtusely angulate in the middle as it is in the species mentioned; the pygidium is 
rather more closely and distinctly punctured; the scutellum and the entire surface, 
except the elytra, are of a clear red colour; the club of the antenne is considerably 
broader than it is in the two allied species, darker in colour, and more distinctly 
emarginate at the extremity; the structure of the prosternum and breast is similar to 
that of C. transversus. 
We have received two male and two female specimens of this species. C. dicolor, Er., 
is said to have the club of the antenne subfuscescent, and I have therefore not identified 
it with this species, which has the club black with its apex somewhat ferruginous. It 
would perhaps be better to remove C. melanopterus from this group to the following 
one. 
Group 2. 
Prosternal process larger than in group 1; mesosternal carina frequently thickened and 
flattened at the base; metasternum not depressed in the middle in front, its margin 
very distinct ; lobes of the labrum rounded and simple; margin of the prothoraxz 
and elytra without spines. (Species 24-46.) 
This is the most numerous in species of any of the groups, and I can at present only 
divide it in an artificial and unsatisfactory manner as follows :— 
A. Colour testaceous or ferruginous (elytra occasionally with vague black vittee). 
Species 24-31. 
B. Elytra black in colour; rest of the body either black (in one or two species only) 
or rufo-testaceous, or rufo-testaceous with the breast and hind body black. 
Species 32-46. 
