PHLC@OTRIBUS. 165 
This species is not represented in our collection. In that of Chapuis there are one 
from Mexico and three from Colombia, formerly in that of Dejean. It is perhaps 
the insect referred to by Lacordaire (Gen. Col. vii. p. 365, nota 2) under the name 
P. mexicanus. 
5. Phleotribus sulcifrons, 
Phleotribus sulcifrons, Chap. Syn. Scol. p. 45 (Mém. Soc. Liége, 1873, p. 253) *. 
Black or obscurely piceous. Closely akin to P. obliquus in size and general appearance, but rather more opaque, 
and differing in the sculpture. The prothorax is hemispherical and not contracted, much more closely 
punctured, and with no trace of a median elevated line. The elytral stria have a more defined border 
and appear incised; their punctures are closer. The interstices are flat throughout, quite opaque, with 
much closer and finer asperities, forming two or three rows on each to behind the middle; towards the 
apex the tubercles are finer and inconspicuous, and the interspaces are closely granular and not smooth 
and shining. 
Length 3-3°6 millim. 
Hab. Guatemata, Las Mercedes (Champion); Panama, Bugaba (Champion).— 
Cotomsia 1. 
This species, hitherto known by a single example in Chapuis’s collection, has been 
taken abundantly by Mr. Champion at Bugaba, and is almost the only Scolytid 
represented in our collection by a really long series. 
The frontal sulcus, from which character the species derives its name, is an unim- 
portant and inconstant character. When present, it extends from the vertex to the 
interocular space, and is distinct from the ordinary rostral impression in the male. 
This and the preceding species possess bristles on the elytra, which may be seen with 
powerful amplification ; but they are so much finer than in all other Central-American 
species that they may be treated as non-existent for diagnostic purposes. 
6. Phleotribus demessus, sp. n. 
Ovalis, opacus, niger, antennis tarsisque rufescentibus, flavo-pilosus ; prothorace granulato ; elytris punctato- 
striatis, interstitiis angustis convexis, dense fortiter asperatis et setis erectis squameformibus uniseriatim 
instructis. 
Mas. Fronte impressa. 
Long. 2 millim. 
Oval, black, rather dull. Head finely granulate, front thinly pubescent, impressed (¢ ), convex (2); antenne 
pitchy-red, club infuscate, the lamelle not very long, scape with a few short hairs in the male. Prothorax 
transverse, subhemispherical, sides and apex almost uniformly rounded, hind angles rounded, hind margin 
bisinuate and somewhat depressed; surface closely rugose, with large, shallow, confluent punctures and 
scattered, short, semierect, yellow hairs. Scutellum small, rounded, convex. Elytra scarcely wider at 
base than the prothorax and about one-half longer, their basal borders rounded, crenate, and everted, 
apex circularly rounded, not strongly margined ; surface convex from base to apex, more strongly behind 
middle, with strong, wide strie impressed with large circular punctures ; interstices narrow, elevated, 
with close transverse ruge, becoming subspinous posteriorly, and conspicuous, yellow, erect, squamous 
setee arranged in single series, sometimes becoming double for a short distance. Underside black; legs 
piceous black, with tarsi lighter ; serration of front tibie fine. 
Hab. Mexico, Toxpam (Sallé); Panama, Bugaba (Champion). 
