PAGIOCERUS.—CNESINUS. 135 
substrigose punctuation, the median line smooth, not elevated, abbreviated and variable in width; the 
flanks impressed and strongly punctured behind. Elytra wider and one-half longer than the prothorax, 
their basal borders oblique, scarcely elevated or crenate, the sides subparallel to behind the middle, or 
subdilated, the apex rounded; surface striate, the strie wide, sharply cut, crenate; interstices flat, 
narrowed towards the apex, with minute uniseriate transverse punctures, and behind the middle with 
short erect sete. Legs red-brown. 
Length 2-2—2°5 millim., 
Hab. Mexico, Vera Cruz?; Guatemata, Senahu in Vera Paz, El Tumbador, Cerro 
Zunil, San Isidro, Pantaleon, Mirandilla, Zapote (Champion); Panama, Volcan de 
Chiriqui (Champion).—CotomBiA?; Braztu2; Car12; Cusal?, 
This species appears to be common and widely distributed in Tropical America, 
though Mr. Champion took but a few examples at each locality. The males appear to 
be constantly smaller than the females, and have the sculpture somewhat less strong ; 
they are well distinguished by the little recurved spine on the rostrum. In the females 
the interocular space varies in depth and gloss; it is sometimes quite shining, without, 
however, approaching the high polish characteristic of the males in Bothrosternus. 
CNESINUS. 
Cnesinus, Leconte, Trans. Am. Ent. Soc. i. p. 171 (1868); Rhynch. N. Am. p. 378. 
Nemophilus, Chapuis, Syn. Scol. p. 27 (1869) (Mém. Soc. Liége, 1873, p. 235). 
In this genus are included those species in which the sutures of the antennal club 
are transverse, and the lateral margins of the prothorax, though usually fairly distinct, 
are not acutely bordered. The forms thus brought together vary in other respects: 
the rostrum is less marked than in the allied genera, except in one or two of the larger 
species; the eyes may be remote and narrow as in Bothrosternus, or larger, more 
strongly granulate, and approximate on the front. The prothorax is usually closely 
strigose, but is shining and punctured in one species. The form is usually elongate 
and slender, but this, as well as the degree of development of the tibial armature, 
depends on the size of the species. The spines of the front tibiz are weaker than 
in the preceding genera, the middle and hind pairs are produced into a small point at the 
upper apical angle, usually without evident fissure, and have one minute tooth on the 
margin. ‘Two species of Cnesenus are hitherto known from the United States and 
Venezuela respectively. In the subjoined table thirteen are given, of which ten, all 
but one. being new, are natives of Central America; two from Venezuela are described 
in footnotes. The species are somewhat difficult to tabulate; two characters on 
which 1 have relied may be mentioned. In one division, to which C. strigicollis 
belongs, the prothoracic punctures are coarser and form by their confluence longi- 
tudinal strige, separated by interspaces which appear, with high amplification, as 
narrow ridges, intersecting each other at intervals to form a network. In a second 
division the punctures are finer and appear to be impressed in the surface, the inter- 
