248 RHYNCHOPHORA. 
specimens from Totonicapam, except that the Cerro Zunil pair are still smaller (3 mm.), 
smoother, and with the elytral calli nearly obsolete. These form a connecting-link with 
two little specimens from San Gerdénimo (2°8 mm.), which have the prothorax nearly 
unicolorous, the elytra more shining and more distinctly punctured, and the apical 
calli feeble and non-tuberculate. 
2. Gnathotrichus bituberculatus, sp. n. 
Elongatus, cylindricus, sat nitidus, sordide fusco-testaceus, prothoracis disco anterius et ventre plus minusve 
infuscatis ; prothorace oblongo, parallelo, ante medium transverse elevato, postice subtiliter vage punctato ; 
elytra lineato-punctatis, declivitate utrinque tuberculata. 
Long. 2°7 millim. 
Mas. Fronte subglabra; declivitate elytrorum oblique retusa, ambitu ad latera marginato, subtus emarginato 
et bisinuato. 
fem. Fronte villosa; declivitate convexa, marginibus suture et apicem anguste divaricatis. 
Elongate, exactly cylindrical, moderately shining, sordid brown-testaceous. Head infuseate ; front( ¢ ) rather 
flat, subglabrous, dull, somewhat closely punctured, the epistoma elevated; front (@ ) villose; antenne 
_ testaceous, the club darker, without evident sexual differences. Prothorax oblong, parallel-sided, subcir- 
cularly rounded in front, the base sub-bisinuate, hind angles narrowly rounded ; surface with an antemedian 
transverse elevation, asperate and very scantily pubescent in front, finely and remotely punctured behind. 
Scutellum fuscous, triangular. Elytra scarcely as wide as the prothorax, one-half longer, separately and 
slightly rounded at base, the humeral angles obliquely rounded, the sides parallel throughout; surface 
cylindrical, finely lineato-punctate, the interstices narrow, flat, impunctate; apex (¢) with a subconvex 
retuse area, margined laterally, with subimpressed rows of fine punctures and short seriate sete, and 
with a simple tubercle on each side in the line of the third interstice, its inferior border rather widely 
excised, the emargination broader than deep, its edges sinuate to form a rounded tooth on each side ; 
apex (2) strongly but not abruptly declivous, infuscate, impunctate, with rows of short setee, the tubercle 
on each side larger, longitudinal, notched, the sutural margins divaricate at apex, with rounded angles. 
Underside and legs sordid fusco-testaceous ; tibiee slender, not widened apically, weakly toothed. 
Hab. Guatemata, Purula in Vera Paz (Champion). 
A pair. The antennal sexual characters usually found in @nathotrichus are absent ; 
the sexes in this case have not been determined by dissection, but are conjectured in 
accordance with the rule as to elytral characters (anted, p. 85). This insect is some- 
what distinct from any other at present referred to the genus, and in the structure of 
its elytra markedly approaches several species of Pterocyclon, from which the d-jointed 
funiculus separates it. 
Subgroup VI. CORTHYLI. 
Corthylide, Eichhoff, Rat. Tom. p. 421. 
Amphicranide, Hichhoff, loc. cit. p. 460. 
This subgroup is rich in species and constitutes the most natural assemblage to be 
found among the Tomicides, and the one most characteristic of the Scolytids of Tropical 
America, to which region it is confined, except for a few stragglers into the temperate 
parts of the American continents. Eichhoff, it is true, divided it into two “sub- 
families,” but such a division is shown by the study of a larger number of species than 
he examined to be quite artificial and untenable, 
