HETEROMERA. AT9 
slightly rounded before the middle, the hind angles sharply rectangular, the anterior angles sharp but not 
very prominent, the surface densely, rather coarsely punctate, the punctures here and there longitudinally 
confluent, especially towards the sides, the disc faintly transversely depressed in the middle before the 
base ; elytra the width of the prothorax at the base, and three times as long as it, subparallel, finely 
margined at the base, with regular series of rather fine, closely placed punctures, the interstices flat, finely 
punctured—the punctures forming two rows on each interstice towards the suture and single rows 
laterally. 
Length 6 millim. 
Hab. Mexico, near the city (Lohr). 
We are indebted to Mr. Flohr for an example of this species. It is closely allied to 
the North-American 7’. pulverea, Horn, and has the head formed as in that insect, 
but differs in its more elongate shape; the eyes are more prominent (the orbits 
impinging very slightly upon them in front); the elytra are much more elongate, with 
the punctures of the series finer and closer, and the interstices flat. 
TRIENTOMA (p. 2). 
Allard’s paper on this genus [ Ann. Soc. Ent. Belg. xxvii. p. 14 (1883)| was overloooked 
by me. No additional evidence is forthcoming as regards the two species described as 
from Mexico (anted, p. 2), and it is exceedingly probable that both of them are from 
the island of San Domingo. T. mexicana is not really distinct from 7. sal/@i, Kr., from 
San Domingo; TZ. rugifrons is an ally of T. ryticephala, All., from the same island, 
but differs in its less opaque surface, more coarsely punctured thorax, and the minutely 
punctured, slightly convex, elytral interstices. 
MESABATES (p. 3). 
Two more species are now added to this genus. These agree with M. latifrons 
(additional specimens of which have been received from Huitzo in Oaxaca) in having a 
short, broad head, which is more or less dilated anteriorly and feebly trilobed in front ; 
the eyes are not at all prominent, and partly divided by the sides of the front; the 
epistoma is declivous and produced in the middle in front, very short as seen from 
above, and limited posteriorly by a transverse depression; the body is apterous. 
M. spissicornis differs from the two other species in being without a supraorbital ridge. 
2. Mesabates spissicornis. 
Moderately elongate, rather depressed, subparallel, opaque, pitchy-brown. Head short, broad, dilated anteriorly, 
thickly, rather coarsely punctate ; the epistoma short, declivous and produced in the middle in front, trun- 
cate at the apex, limited posteriorly by a shallow transverse depression; the eyes very small, almost 
divided by the sides of the front, which are rounded anteriorly and thickened, without supraorbital ridge ; 
antenne long and stout, thickening outwardly, joints 9 and 10 very strongly transverse; prothorax 
transverse, the sides moderately rounded, very feebly sinuate before the base, widest at the middle, very 
little wider at the base than at the apex, the anterior and hind angles prominent but rather obtuse, the 
base subtruncate, the entire surface uniformly, densely, rather coarsely punctate; elytra the width of 
3QQ 2 
