246 RHYNCHOPHORA. 
blackish, subconvex in front, finely and rugosely punctured, with a fine median carina reaching the 
vertex, pubescence short; eyes coarsely granulate, scarcely emarginate; antenne ferruginous, large, 
broad-oval, with strongly curved sutures, very indistinct on the outer face, which is entirely covered 
-with short hairs, more distinct within, with the margins fringed with very short hairs. Prothorax longer 
than broad, nearly semielliptic, the sides nearly straight behind, very slightly constricted in front, the 
apex rounded, hind angles rectangular, margined, the margins extending forwards along the sides, base 
subtransverse, distinctly margined; disc gradually and convexly declivous in front, without median 
elevation, with close and rather fine granulation, sparser and weak over the basal half, median line 
narrow, abbreviated, and scarcely raised. Scutellum small, rounded-quadrate, punctured. FElytra about 
as wide as the prothorax and one-half longer, with rounded shoulders, the sides subparallel to the 
middle, thence gently incurved to the rounded apex; surface alutaceous, with fine close punctuation in 
indistinct lines, sutural stria narrowly impressed from behind the middle; declivity convex, oblique, set 
with rows of short semierect hairs, the sutural margins slightly elevated. Underside fusco-ferruginous, 
pubescent; anterior coxe closely approximate; abdominal segments 1 and 2 scarcely longer than 3 and 4; 
pygidium just visible from below. Legs ferruginous, the tibia rather slender and moderately spinose ; 
the three basal tarsal joints short, equal, and rather stout. 
Hab. Guatemaa, Cerro Zunil (Champion). 
One example. Only two antennal sutures are visible, which are very strongly 
curved, but not concentric as in Xylocleptes. 
GNATHOTRICHUS. 
Gnathotrichus, Eichhoff, Berl. ent. Zeitschr. 1868, p. 275; Rat. Tom. p. 405. 
Pityophthorus, Leconte, Rhynch. N. Am. p. 349 (pars). . 
Crypturgus, Zimmermann, Trans. Am. Ent. Soc. 1868, p. 142 (pars). 
Cryphalus, Leconte, Trans. Am. Ent. Soc. 1868, p. 153 (pars). 
This genus contains a few described species only, of which three are North American 
and three are natives of Chili. JI add two others from Central America. All are 
much alike, and easily distinguishable by their general appearance. They are elongate 
and cylindrical, and remarkable for the smoothness of the hinder half of the prothorax 
and elytra, which exhibit only the very finest punctuation and are delicately reticulate. 
The maxille are set with close and fine sete. The antennal scape is rather long; the 
club is rounded-oval, flattened, with moderately curved but not concentric sutures, set 
with a fringe of thin sete, which are longer than in Pityophthorus. The prothorax is 
somewhat flattened, but is not constricted in front and has no lateral impressions; the 
discal elevation forms a small, sharp, transverse ridge, quite characteristic in shape ; 
the ventral opening is very oblique, and there is no basal border. The elytra are wholly 
without impressed strie, even the sutural stria being absent. The pygidium is ventral. 
The legs are long and slender; the tibizw are narrow, gradually widened towards the 
apex, and armed at the extremity of the upper margin with two teeth, and with traces 
of others towards the base; the tarsi are slender, and relatively longer than in 
Pityophthorus. 
The species of Gnathotrichus are, so far as is known, pine-feeders, and bore into the 
wood, the larve, as with other wood-boring Scolytids, being nourished on “ambrosia.” 
