340 NITIDULIDA. 
Independently of the structure of the labrum, it may be known by the shorter prosternal 
process and by the extreme difference between the sexes. Although we have received 
only one male and three females, and I have no special evidence that they are the sexes 
of one species, I do not feel much doubt as to such being the case. The male greatly 
resembles that sex of C. cognatus (the large varieties) and of C. pyxis, but differs from 
both in having the hind tibiz rather longer and more slender; the thorax, too, is quite 
dull and without sculpture, while in the male of C. pyais the thorax is shining, and 
even in the largest varieties of the male of C. cognatus, though the head and thorax are 
dull, their sculpture is not so obsolete as it is in this sex of C. biformis. The apices of 
the elytra leave the pygidium quite exposed in the male, and are, indeed, not longer 
than in C. cognatus. The female has the upper surface entirely shining, the head and 
thorax distinctly though finely punctate, the elytra elongate, completely covering the 
pygidium, the apices much prolonged and sinuate at the sides. In both sexes the 
club of the antenne is moderately broad, brown though not at all blackened. The - 
mesosternal carina is rather slender, and its lower face is not flattened. 
B. 
Elytra black. (Species 32-46.) 
This section I cannot divide in any way that would really facilitate the determination 
of the species. In many of them the apices of the elytra are peculiar in form in the 
female sex; this should be one of the first characters looked at in examining a species, 
and those in which this is not the case (Nos. 32-40) are here placed first. 
32. Camptodes nigrinus, sp. n. 
@. Oblongo-ovalis, minus convexus, sat nitidus, niger; antennis testaceis, clava lata, nigra; tarsis rufis ; 
prothorace subtilissime punctato. 
Long. 4 millim. 
Hab. GuatEMALA, Zapote (Champion). 
Head moderately closely and finely punctured, with a deep puncture on either side 
of the very indistinct clypeal suture. Thorax rather short, extremely finely punctate. 
Elytra sparingly and finely punctate, somewhat short; apices each separately rounded. 
Pygidium sparingly and finely punctate, moderately shining. Mesosternal carina 
slender. One specimen. 
This insect, except in colour, comes very close to C, eaternus; it is also extremely 
similar to the smallest specimens of C. aberrans of the preceding section. 
33. Camptodes limbicollis. 
Camptodes limbicollis, Reitter, Verh. Ver. Briinn, xiii. Abhandl, p. 113°. 
Hab. Mexico !, Teapa (H. H. Smith); Guatemaza, San Juan in Vera Paz (Champion). 
