802 RHYNCHOPHORA. 
patch on the outer part of the disc of each elytron (fig. 17), the other immaculate. 
The vestiture of the upper surface is semierect and setiform, and the prothorax is 
coarsely punctured. The mandibles are very slightly decussate at the tip. 
85. Gerzus albosetosus, sp. n. 
Subrhomboidal, narrow, black, shining ; above sparsely clothed with setiform white scales intermixed with 
blackish more or less erect hairs, the white scales on the prothorax condensed along the basal margin or 
down the middle, the vestiture of the elytra arranged in a single line down each interstice, that of the 
under surface rather sparse and white, denser on the meso- and metasternal side-pieces. Head finely 
punctate; rostrum arcuate, about as long as the head and prothorax, thickened towards the base, and 
somewhat closely punctate—in the 2 more abruptly bowed at the base, flattened towards the tip, 
and much smoother,—the antenne inserted at the middle, the antennal club stout, short-ovate. 
Prothorax transverse, rounded at the sides anteriorly, strongly constricted in front ; rather coarsely, 
confluently punctate, sometimes with a smooth central line. Elytra subtriangular, deeply punctate- 
striate, the interstices finely and irregularly uniseriate-punctate. Beneath densely punctate; first 
ventral segment broadly depressed down the middle in the g. Prosternum unimpressed behind the 
transverse subapical groove. 
Length 21-23, breadth 1-14 millim. (¢ 9.) 
Hab. Mexico (Dupont, in Mus. Brit.), Chilpancingo (H. H. Smith), Jalapa (U.S. 
Nat. Mus.) ; GuatEMAta, near the city (Salvin), Capetillo, Duefias (Champion). 
Seven specimens, all females but one. Smaller and less rugose than G. varius, 
the antenne inserted at the middle of the rostrum, the elytral interstices finely 
uniseriate-punctate. The vestiture is somewhat variable in extent, and the blackish 
hairs (conspicuous in one of the examples from Guatemala city) are not always 
_ present. 
86. Gerzeus inchoatus, sp. n. 
Ovate, shining, black, the antenne and tarsi obscure ferruginous ; the prothorax with a transverse patch at 
the anterior and posterior angles, the elytra with a streak on the sutural interstice at the base, the 
prosternum with a transverse band in front, and the metathoracic episterna, thickly clothed with rather 
coarse, oblong, white scales, the elytra also with scattered similar scales at the base and on the apical half, 
the rest of the under surface and the legs with scattered, very small, hair-like, white scales. Head finely 
punctate, transversely depressed between the eyes; rostrum strongly arcuate, rather slender, thickened 
towards the base, slightly longer than the head and prothorax, very finely punctate, rugose laterally in 
its basal half, the antenne inserted behind the middle, the antennal club ovate. Prothorax short, 
arcuately narrowing from the base, strongly constricted and tubulate in front, closely punctate, except 
along the median line. Scutellum subquadrate. Elytra subtriangular, much wider than the prothorax, 
rather convex; sharply, narrowly striate, the interstices broad, flat, faintly uniseriate-punctate, the 
punctures becoming more distinct on the apical half. Beneath closely punctate ; first ventral segment 
slightly depressed down the middle in the g. Prosternum short, with a narrow shallow median sulcus, 
Anterior coxe narrowly separated. Tibie feebly unguiculate in both sexes, 
Length 2,1,-24, breadth 13-12 millim. (¢ 2.) 
Hab. GuateMa.a, Duefias (Champion), Trece Aguas (U.S. Nat. Mus.). 
Four specimens. The shining surface, the transverse white patch at each angle 
of the prothorax, the white streak behind the scutellum, and the scattered white scales 
at the base and on the apical half of the elytra distinguish G. inchoatus. It is less 
