182 RHYNCHOPHORA. 
the interstices with single rows of scarcely finer punctures. Underside fuscous-black with the last three 
abdominal segments testaceous, sometimes entirely testaceous, subglabrous. Legs testaceous-brown. 
Hab. Guatemata, Cerro Zunil (Champion). 
Three examples. I have seen others from tobacco-refuse. ‘This species most nearly 
approaches H. glaber of those herein described. ‘wo allied forms, from Teapa in 
Mexico, and Capetillo in Guatemala, are represented by single examples in bad 
condition, and are left undescribed. 
3. Hexacolus unipunctatus, sp. n. 
Subelongatus, nitidus, supra glaber, niger, ore, prothoracis macula discoidali (que rarius deest), antennis, 
pedibus rufescentibus; prothorace latitudine sublongiore, sparsim punctato et versus apicem tenuiter 
rugato ; elytris punctato-striatis, striis postice profundioribus, interstitiis subconvexis, seriato-punctatis, 
alternis in declivitate obliqua subelevatis. 
Long. 2 millim. 
Mas. Fronte subimpressa, supra os pallescente, plaga media subelevata infuscata ; antennarum scapo 
cillato. 
Fem. Fronte subconvexa, preter os transverse impressa, vix pallidiore ; antennarum scapo haud ciliato. 
Rather elongate, glabrous above, black, the prothorax usually with an obscure reddish spot. Front (¢) 
longitudinally impressed, granulate-punctate, becoming pale testaceous over the mouth beneath a median 
pyriform shining piceous-black elevation, pubescence scanty, villous ; front (@ ) subconvex, subglabrous, 
with stronger scattered punctuation, transversely impressed and indistinctly paler over the mouth, with 
no median elevation: the darker parts with a bluish opalescence in both sexes. Antenne testaceous- 
brown, the scape straight, in the male with a fringe of cilia on the inner border increasing in length 
apically, funiculus short, joints 2-6 transverse, almost perfoliate, increasing in width, club infuscate, 
rather small, oval, subcompressed. Prothorax a little longer than broad, its basal margin bisinuate, 
bordered towards the rounded and margined hind angles, the sides slightly curved and narrowed anteriorly, 
margined, apical angles rounded, the anterior border obtuse ; surface somewhat flattened in the middle, 
obliquely and not strongly declivous in front, with an indistinct and variable longitudinal subelevated 
line before the lozenge-shaped discoidal spot, which is rarely absent, its anterior third subasperate with 
very fine elevated rugs, the rest rather dull, finely and diffusely punctured, the punctures stronger and 
closer towards the base, interspaces delicately and closely reticulate. Scutellum rounded, shining. 
Elytra as wide as the prothorax and one-half longer, the basal margins separately curved, humeral angles 
callous and subrectangular, sides straight to the middle, thence rounded in an oblique curve to the apex ; 
surface gradually and obliquely declivous behind the middle, shining, glabrous, with rather strong 
punctured strie deeper posteriorly, interstices narrow, feebly convex, each with an irregular row of 
minute punctures, the 1st and succeeding alternate interstices more distinctly convex towards the apex. 
Underside black, shining, glabrous, the abdominal segments separately convex from before backwards, 
the fifth with two sete at apex; legs piceous. 
Hab. Guaremata, Cubilguitz in Vera Paz (Champion). 
Seventeen specimens. ‘The bluish opalescence of the forehead resembles that which 
exists in Cnesinus teres (p. 141); these form the only instances I have seen in the 
Scolytides of an approach to metallic coloration, with the well-known exception of 
Camptocerus eneipennis (Fabr.). ‘The sexes have been determined by dissection. The 
apical sete of the last ventral segment exist in both sexes; they are also present in 
the following species, and may possibly prove of importance as a character on which to 
subdivide the genus. 
