124 RHYNCHOPHORA. 
not elevated. Scutellum punctiform, deeply situate. Elytra narrower than the prothorax and not quite 
one-half longer, subtruncate, and not margined at base, the shoulders prominent, the sides sinuate but 
not contracted towards the obtusely-rounded apex ; dull, with close weakly-impressed strie, their punc- 
tures strong and confluent at base, weaker behind, interstices narrow and subconvex, with single rows 
of similar punctures bearing scattered squamiform sete, chiefly towards apex. Legs piceous or rufescent. 
Underside piceous ; the thorax and first two abdominal segments with coarse punctures bearing minute 
tufts of hair, remaining segments rugose. 
Hab. Guaremata, Torola, Las Mercedes, Zapote, Rio Maria Linda (Champion). 
A dozen specimens were taken at various adjoining localities; I have also seen it 
from Mexican tobacco-refuse. It has quite the appearance of a somewhat elongate 
Scolytus, but the generic characters separate it very decidedly from that genus, and 
indicate it as a link between the Scolyti and Camptoceri. 
Subgroup II. CAMPTOCERI. 
Camptocérides, Lacordaire, Gen. Col. vii. p. 8366 (ex parte). 
The Camptoceri are very closely allied to the true Scolyti, but are without the 
abrupt dorsal flexure of the abdomen, which is regularly recurved. The antennal 
funiculus is furnished, usually in the male alone, with long stout cirrate hairs, which 
curve round the lower border of the club; these are sometimes present in the female, 
when they are much shorter and finer. The club is flattened, variable in shape, and 
very indistinctly articulate, the sutures being usually imperceptible, unless the organ is 
mounted in balsam, which usually brings out a single suture towards the base, rarely 
crossing the club, and generally not so strongly flexed as in Scolytus. 
The legs are constructed much as in the latter genus, the tibie being furnished with 
a well-developed apical mucro above the tarsal articulation ; at the base of this mucro, 
and on its outer side, there is present, in the middle and hinder pairs of tibie, a small 
second tooth, which in the larger species of Camptocerus may be so reduced as to be 
hardly discernible. 
From this subgroup, as here delimited, must be excluded the Paleotropical genus 
Diamerus, Ex. (Acanthurus, Kichh.), referred to it by Lacordaire, of which the true 
affinities seem quite doubtful. 
The Camptoceri are exclusively confined to tropical and subtropical America, and 
have been divided into four genera, of which Cnemonyzx is not found within our limits. 
These genera are ill-defined, and, after carefully examining the type species, though 
necessarily without dissection, I cannot distinguish them on precise characters. 
Tarsi not elongate, the 3rd joint bilobed or cordate. 
Prothorax strongly and abruptly narrowed in front, with extremely close fine 
uniform punctuation; club oblong or obovate: size moderately large . . Camptocerus. 
Prothorax gradually rounded and narrowed in front, with relatively stronger, 
sparser unequal punctuation: size small. 
