LATHROPINUS.—HETEROLEUCUS. 629 
oblong-quadrate, very shining and impunctate in front, the vertex rather finely punctate, 
the disc also punctate in a curvate manner, and this punctuation only imperfectly 
separated from the sculpture of the vertex. Thorax oblong, considerably longer than 
broad, straight at the sides; shining, with an impunctate space along the middle, along 
each side of this punctate on a longitudinal space extending all along the thorax, and 
outside of this more sparingly punctate, all the punctures rather fine. Elytra scarcely 
at all longer than the thorax, rather sparingly and moderately coarsely punctured. Hind 
body rather closely but obsoletely punctate, much less shining than the other parts, 
the hind margins of the segments obscurely reddish, the apex itself red. The unique 
example is apparently a female. 
HETEROLEUCUS. 
Corpus subcylindricum, crassum. Antenne geniculate. Caput parvum, oculis marginem posteriorem 
attingentibus. Mandibule unidentate, dente acuto. Pedes breves; tibia inermes; tarsi anteriores 
rotundati, intermedii et posteriores articulo quarto parvo. 
This genus is well distinguished by the strongly geniculate antenne, and by the 
shape of the mandibular tooth, which is simply acuminate instead of being chisel- 
shaped at the extremity. The form and sculpture are characteristic and do not occur 
in any of the allied genera, though approximated by the Old World Pinophilus brevi- 
collis, Kr. The genus is peculiar to Tropical America, and will comprise P. crassi- 
collis, Er., P. abax and P. egens, Sharp, in addition to the two found in our region. 
1. Heteroleucus marginatus. (Tab. XVI. fig. 18.) 
Parum elongatus, niger ; capite prothoraceque nitidissimis, elytris rufis, crebrius fortiterque punctatis ; antennis, 
palpis pedibusque albido-flavis ; abdominis lateribus cinereo-pubescentibus, apice flavo-fusco maculato. 
Long. 12 millim. 
Hab. GUATEMALA, near the City, San Gerdnimo, San Joaquin, Balheu (Champion). 
Antenne short, the basal joint equal in length to the four following joints together. 
Head small, very shining, with a curvate series of punctures commencing at each angle 
of the clypeus and extending far backwards transversely across it, and a few punctures 
near each hind angle. Thorax slightly transverse, nearly straight at the sides, very shining, 
black, with two widely separated series each consisting of five or six punctures along 
the middle, and with four or five punctures on each side. Elytra coarsely and densely 
punctate, longer than the thorax. Hind body densely punctate, dull, the pubescence 
along each side cinereous, the hind margin of the penultimate segment pallid yellow 
with a fuscous dorsal mark. Legs very pale yellow. Male with the middle of the 
last ventral plate prolonged and acuminate at the apex, with a very short rather abrupt 
sinuation on either side. Some of the individuals of this sex have a very long seta 
projecting from the interior of the body quite at the apex. 
Found on the sandy banks of streams (Champion). 
