SITOPHAGUS.—ULOSONIA. 163 
closely and not very finely punctured; prothorax transverse, the sides almost straight from the middle to 
the base, strongly narrowing anteriorly, the base feebly bisinuate, subtruncate, and with a shallow longi- 
tudinal fovea on each side, the apex deeply arcuate emarginate, the anterior angles prominent, obtuse, the 
hind angles subrectangular, the disc sometimes shallowly impressed transversely before the base, the 
surface closely, finely, and equally punctured (a little more finely and more diffusely than the head) ; 
elytra long, about three times the length of the prothorax, regularly punctate-striate (the punctures 
shallow, not coarse, and closely placed), the interstices feebly convex towards the sides and apex, finely and 
sparingly punctured; beneath shining, sparingly punctured; intermediate coxal cavities slightly open 
externally, the trochantin barely visible. 
Length 6-7 millim. 
Hab. Mexico, without locality (Hége). 
Numerous examples. This species agrees so nearly with Sitophagus in its principal 
characters that I venture to place it in that genus; the head, however, is unarmed in 
both sexes, and, owing to the deep emargination of the front of the thorax, appears less 
deeply inserted ; the epistoma is emarginate in front; the antenn are formed much as 
in §. fuliginosus, but with the second joint shorter and the outer joints broader and 
more transverse. In general form somewhat resembling Cyneus, but with differently 
formed antennex, broadly margined elytra, longer legs, and slightly gaping intermediate 
coxal cavities (as in Sitophagus); the head is formed much as in Cyneus. 
ULOSONTIA. 
Ulosonia, Castelnau, Hist. Nat. ii. p. 220 (1840); Lacordaire, Gen. Col. v. p. 336; Leconte, Class. 
Col. N. A. p. 233; Horn. Rev. Ten. of Am. north of Mexico, p. 366; Lec. & Horn, Class. Col. 
N. A. p. 381. 
Hypogena, De}. Cat. 3rd edit. p. 220. 
The name Ulosonia was originally used by Castelnau for a section of the genus 
Uloma containing two Tropical American species, U. hololeptoides and U. tricornis. 
Lacordaire (Joc. cit.) fully describes the genus, making it include U. bi-impressa (from 
Colombia) and U. hololeptoides, this author omitting all reference to U. tricornis. 
Ulosonia is retained here solely for U. bi-impressa, U. tricornis, and allies, numerou in 
species in Tropical America ; U. hololeptoides will be the type of the genus Sitophagus. 
The different species are found beneath bark in the humid forest regions of Tropical 
America, more especially in the “ tierra caliente; we now have to record six species 
from our country, one of which is found just on our northern boundary, the genus 
ranging from the Colorado desert to the Amazons valley. 
1. Ulosonia tricornis. 
Uloma (Ulosonia) tricornis, Cast. Hist. Nat. ii. p. 220°. . 
Hypogena tricornis, Jacq. Duval in Sagra’s Hist. Cuba, p. 63, t. 8. fig. 16 (Spanish edit., 1856), and 
p. 148, t. 8. fig. 16 (French edit., 1857) *; Dej. Cat. 3rd edit. p. 220. 
Hab. Mexico (coll. F. Bates), Yucatan (coll. Oberthiir), Tehuantepec, Playa Vicente, 
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