460 SUPPLEMENT. 
Two specimens. ‘This species is closely allied to X. argentatus, but differs from it in 
having the dark patch on each elytron rounded (instead of triangular), not extending 
forwards at the side in front, and only feebly emarginate behind; the antenne are a 
little thickened at the tip, and their second joint is very little shorter than the third. 
Mr. Flohr informs me that the insect also occurs in the vicinity of the city of Mexico. 
32 (a). Xylophilus silaceus. (Tab. XXI. fig. 13, ¢ .) 
Moderately elongate, rather broad, subopaque, pitchy-brown, or obscure brownish-yellow with the prothorax 
ferruginous, the head a little darker; the upper surface clothed with very fine, appressed, pruinose 
pubescence, which almost hides the punctuation; the head and prothorax exceedingly minutely, the 
elytra very finely, punctate. Head moderately large, rounded at the sides behind the eyes, the latter 
very small in both sexes; antennz fusco-testaceous, slender—( ¢ ) very elongate, thickening outwardly, 
joint 2 short, about half the length of 3, 3-8 very long, increasing in length, 9 and 10 a little shorter 
than 8,11 longer and stouter than 10, ovate, acuminate—( ?) shorter, with the penultimate joints 
much less elongate; prothorax about as long as broad, compressed at the sides about the middle, and with 
a deep oblique groove on either side of the disc behind, the grooves separated by a short carina; elytra 
parallel in their basal half, with an oblique depression on the disc extending from the shoulders inwards ; 
legs fusco-testaceous, elongate, slender, the femora and tibize simple in both sexes. 
Length 12-2; millim. (¢ @.) 
Hab. Mexico, Tlalpam (flohr). 
Three specimens, two males and one female. In its fine pruinose pubescence this 
species resembles X. sericeus; but it is more elongate than that insect, and has a 
smaller head, small eyes, and more elongate legs, the hind femora simple in both sexes. 
_X. silaceus is perhaps nearest allied to X. singularis, with which it nearly agrees in the 
form of the head, antenne, and legs. 
CNOPUS. 
Head very broad ; eyes rounded, entire, prominent, moderately large, coarsely granulated, separated by a space 
equalling the width of the prothorax; antennz elongate, with the second and third joints subequal in 
length and thickness; prothorax transverse, very much narrower than the head, with a deep, transverse 
groove before the base, and an oblique one on either side towards the apex; elytra short, broad, mode- 
rately convex, a little rounded at the sides; first and second ventral segments connate; legs very short 
and slender; the tarsi with their penultimate joint minute, their basal joint very short, scarcely longer | 
than the following two joints united; the other characters as in Xylophilus. 
The above generic name is proposed for a very minute insect from.Mexico, of which 
we have received a single male example. 
It differs from Xylophilus in having the basal joint of all the tarsi very short, scarcely 
longer than the following two joints united. The legs themselves are also much shorter 
than in that genus. The thoracic grooves are very deep and sharply defined. 
1. Cnopus flohri. (Tab. XXI. figg. 14,3; 144, antenna; 144, hind leg.) 
g. Very short, moderately broad, shining; the head (the eyes excepted) and prothorax rufo-testaceous, the 
elytra black, the antennw, palpi, and legs testaceous, the under surface (the head and prothorax excepted) 
black; the upper surface very sparsely pubescent, the pubescence not hiding the sculpture. Head with a 
