244 RHYNCHOPHORA. 
half distinctly but finely punctured on each side of the smooth median line, the punctures becoming weak 
toward the sides. Scutellum small, rounded. Elytra nearly one-half longer than the prothorax and 
narrower at base, their sides slightly curved throughout and converging behind, broadly rounded at apex ; 
with rows of extremely fine punctures, the interstices flat, with irregular microscopic punctures, the hinder 
third bearing short uniseriate bristles ; the subsutural stria impressed from behind the middle, widened 
on the declivity, its fundus smooth and impunctate, the sutural and outer margins subtuberculate. 
Hab. GuatEMaLa, Coatepeque (Champion). 
This little species, represented by a single example, is easily distinguished by the 
almost microscopically fine elytral punctuation and the aberrant antennal club. That 
the latter structure should exist in an insect which is in other respects a perfectly 
normal Pityophthorus goes to prove, if proof were wanting, that the shape of the 
joints and consequently of the sutures in that organ is far from affording an infallible 
guide to the generic division of the Scolytide. 
15. Pityophthorus carinifrons, sp. n. 
Oblongus, subnitidus, subglaber, piceus, capite nigricante, antennis pedibusque ferrugineis ; earum clava magna, 
suborbiculari, indistincte articulata; fronte media carinata; prothorace antice subconstricto, dorso 
posterius asperate punctato, linea media levi elevata; elytris alutaceis, subtilissime punctatis, postice 
brevissime sparsim setosis, declivitate convexa, sutura subelevata. 
Long. 1°7 millim. 
Oblong, not elongate, subnitid and nearly glabrous, piceous-brown. Head pitchy-black, rufescent towards the 
mouth, convex in front, rugose and sparingly pubescent, with a narrow, acute, median carina extending 
from mouth to vertex; eyes emarginate; antennw testaceous-yellow, the club very large, orbicular, 
uniformly covered with short hairs, with two indistinct strongly curved sutures towards the base. 
Prothorax ample, as long as broad, scarcely constricted towards the strongly rounded apex, the sides 
gently rounded behind, the hind angles subrectangular, the base sub-bisinuate; disc without evident 
median elevation, with very short scanty pubescence, in front obliquely declivous, with concentric rows 
of asperities which become weaker behind, to be replaced over the basal portion by subasperate punctures, 
the median line shining and subelevated. Scutellum small, triangular, punctured. Elytra rather 
narrower than the prothorax and one half longer, widest at base, the sides converging from the middle and 
gradually rounded to the apex; surface finely punctured in indistinct irregular rows, with an impressed | 
stria along each side of the suture from the middle to the apex, interstices alutaceous ; declivity convex, 
with a few short scattered sete and a row on each sutural margin. Underside piceous ; pygidium visible 
from beneath. Legs testaceous. 
Hab. Mexico, Motzorongo in Vera Cruz (Flohr). 
One example. The elytra, like the prothorax, show, in addition to the apical sete, 
a few minute hairs, visible only under the microscope. This species bears a strong 
general resemblance to the group of which P. pubipennis, Lec., is representative, 
agreeing with them in the extremely fine punctuation of the elytra. It is, however, 
peculiar in the structure of the antennal club. 
16. Pityophthorus politus, sp. n. 
Oblongus, subovalis, glaber, ferrugineus ; prothorace semielliptico, dorso subsequaliter convexo, post medium 
subopaco, sat dense subtiliter punctato, linea media levi; elytris nitidis, tenuiter lineato-punctatis, stria 
suturali vix impressa, interstitiis planis, levibus, apice fortiter convexe declivi, sutura subelevata, margine 
postico obtuse rotundato. 
Long. 2°4 millim. 
