HYPOTHENEMUS. 231 
from the middle, lineato-punctate, with a single deep subsutural stria on each side, punctured towards 
the base alone ; interstices alutaceous, impunctate, with afew sete on the declivity, which has the second 
row of punctures striate at the apex. Underside fusco-piceous, the anal aperture ventral; tibie linear, 
with a few small marginal teeth. 
Hab. Nicaraeua, Chontales (Janson) ; Panama, Bugaba, Los Remedios (Champion). 
We have a pair from Bugaba and a single specimen from Los Remedios, and from 
these the description has been drawn up; they measure 2 millim. in length. The 
Chontales example is only half the size (length 1:5 millim.), more ferruginous, with 
the prothorax shorter, less constricted, more obtuse at the apex, the tubercles weaker ; 
the elytra more parallel-sided, the sutural stria shallower, the bristles fewer and very 
short. ‘The complete absence of scales and the paucity of hairs give this species a 
different aspect from that of most Hypothenemi, with which, however, it conforms in 
structure and shape. 
Subgroup V. PITYOPHTHORI. 
Pityophthoride, Kichhoff, Rat. Tom. p. 210 (pro parte). 
The Pityophthori, as here defined (anted, p. 185), include certain small Tomicids 
with a 4- or 5-jointed funiculus, a simple antennal club with transverse or curved 
sutures, slender tibie, non-retractile tarsi, and an elongate or subelongate body, without 
any dense vestiture of hairs or scales. These characters do not indicate a well-defined 
aggregate; and the four genera from Central America, here included in the group, have 
possibly not much in common. It has, however, proved difficult to separate them on 
precise and easily ascertainable characters. 
Basal half of the prothorax distinctly granulate, except sometimes over the middle 
line, not bordered basally. 
Antennal funiculus 5-jointed; club acuminate-ovate, the second joint large, 
sutures strongly curved. Superior border of the tibiz with several weak 
teeth © 2. ee ee ee ee ee ee ee ww.) Styphlosoma. 
Antennal funiculus very short, 4-jointed ; club oval, flattened, with transverse 
sutures. Superior border of the tibiz with two teeth only . . . . . Dendroterus. 
Basal half of the prothorax simply punctured or smooth ; rarely finely granu.ate, 
in which case it is bordered basally. 
Sutures of antennal club transverse, rarely curved, not fringed with long sete. 
Prothorax more or less distinctly bordered at base. Form not very elon- 
gate. Punctuation of prothorax or elytra, or both, usually more or less 
distinct. Species (so far as known) phleophagous, with the maxille set 
with stout spines . 2 1 ee ee ee eee ee www ee )~=6~Pityophthorus. 
Sutures of antennal club curved, with rather longer sete. Prothorax not 
bordered at base. Form elongate, subcylindrical. Punctuation of pro- 
thorax and elytra very fine and obsolescent, their surface more or less 
alutaceous. Species xylophagous, with the maxillz set with slender sete. Gnathotrichus. 
Although the differential characters above given do not distinguish Pityophthorus 
