CENOPION.—CENTRONOPUS. 99 
emarginate, distinctly separated from the front; the sides of the front slightly divergent ; prothorax broad, 
transversely convex; scutellum large, triangular; elytra about twice the length of the thorax, not 
contiguous to the thorax, transversely convex, strongly rounded at the sides, the apex a little produced 
and rounded, humeri obsolete, finely punctate-striate; all the femora rather coarsely punctured and 
slightly swollen at their apices; tibie and tarsi as in Mitys, the tibie rather coarsely punctured ; 
epipleure narrow, indistinct, confounded with and not distinctly separated by a carina from the elytra, 
obsolete before the apex ; prosternum rather broad, horizontal, the apex produced and rounded, rugulose, 
with a shallow groove on each side, between which convex ; posterior coxe and intercoxal process as in 
Mitys. Apterous. 
One species from Mexico. (nopion may be known from its allies by the structure 
of the mentum and epipleure; it is nearest allied to Mitys, Hipalmus (Lobetus, 
Motsch.), and Celocnemis. 
1. Gnopion gibbosus. (Tab. V. fig. 8; 8a, mentum and labial palpi; 84, 
maxilla and maxillary palpus.) 
Oblong ovate, very convex, black, slightly shining. Head finely and sparingly punctured, the space between 
the eyes flattened and shallowly impressed on each side; prothorax transverse, widest anteriorly, 
narrowed from before the middle to the base, strongly and transversely convex, swollen anteriorly, 
anterior angles rounded, hind angles obtuse, lateral margins scarcely visible from above, basal margin 
distinct, feebly bisinuate and scarcely emarginate in front, base feebly bisinuate, with an indistinct central 
channel obsolete before the middle, the disc slightly impressed on each side behind the middle, finely but 
not very closely punctured; elytra a little wider than the thorax at the base, strongly rounded at the 
sides, transversely convex, widest a little beyond the middle, with rows of fine distant punctures, the 
interstices flat and with very fine transverse scratches or wrinkles. 
Length 21 millim. 
Hab. Mexico, Cerro de Plumas (Hége). 
One example. 
CENTRONOPUS. 
Centronopus, Solier, Studi Ent. p. 258, t. 11. f.4-8 (1848) ; Lacord. Gen. Col. v. p. 360 (nec Horn). 
Centronipus, De}. in litt. 
Scotobenus, Lec. Proc. Acad. Phil. 1859, p. 88; Horn, Rev. Ten. N. A. p. 340. 
This genus was founded by Solier upon a single species (C. suppressus, Say) from 
Mexico; we have now to add another species from that country. Closely allied forms 
are found in North America. Dr. Horn (Trans. Am. Ent. Soc. v. p. 15, 1875) has 
proposed the name of Scotobates for two North-American species (C. calcaratus, Fabr., 
and C. opacus, Lec.) formerly referred to Centronopus; Mr. C. O. Waterhouse, however, 
has pointed out (Ann. Nat. Hist. 4th ser. Xvii. p. 288) that the C. calcaratus, Fabr., 
belongs to the genus Menechides, Motsch. (Bull. Moscou, 1872, p. 23). In the male of 
Centronopus the epistoma is rounded in front, the anterior margin reflexed and slightly 
raised in the centre; in the same sex of Scotobenus the epistoma is, as in the female of 
both, truncate, and the anterior margin not reflexed; these differences, however, are 
scarcely of generic importance. 
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