GERAUS. 263 
dense oblong patch of coarse white scales at the base of the third interstice; the under surface (a broad 
space down the middle of the abdomen excepted) also clothed with white scales, these becoming coarser 
and closer along the sides, and there condensed into an interrupted stripe which is continued across the 
prosternum. Head closely punctate, transversely depressed between the eyes; rostrum long, strongly 
arcuate, slender and almost smooth, the short basal portion abruptly thickened and rugosely punctate, 
the antennee inserted close to the base, joint 2 of the funiculus nearly as long as 1, the others shorter, 
gradually decreasing in length, the club oblong-ovate, acuminate, and with distinct transverse sutures. 
Prothorax transverse, rather convex, rounded at the sides, narrowed and strongly constricted in front, 
closely punctate. Scutellum small, transversely subquadrate. Elytra triangular, narrowly and sharply 
striate, the strie faintly punctate, the interstices flat and minutely punctate. Beneath closely, the broad 
almost bare space down the middle of the abdomen sparsely, punctate. Legs rather long and slender, the 
femora abruptly clavate. 
Length 41, breadth 2, millim. ( 9.) 
Hab. Mexico, San Andres Tuxtla in Vera Cruz (Sal/é). 
One female. The dense streak of pure white scales at the base of the third elytral 
interstice gives this insect the general appearance of various species of Cylindrocerus 
and Madarus. The antenne (2) are inserted close to the base of the rostrum and 
have a rather long club, the prothorax and elytra are fusco-pilose, and the femora are 
abruptly clavate. The prosternum will probably prove to be bispinose in the male. 
3. Gerzeus serratispinis, sp.n. (Tab. XIV. figg. 21, 21a, , 3.) 
3. Subrhomboidal, somewhat flattened above, shining, black; the prothorax above and beneath sparsely 
clothed with long, ochreous, hair-like, transversely-arranged scales, the elytra with irregular rows of 
intermixed ochreous and black, adpressed, setiform scales, the rest of the surface with narrow, hair-like, 
ochreous or yellowish scales. Head sparsely punctate, transversely depressed between the eyes, the 
latter very large ; rostrum arcuate, slender, reaching to beyond the apex of the metasternum, abruptly 
dilated and sulcate on each side from about the basal third and gradually narrowing thence towards the 
tip, striate-punctate, smooth down the centre, the antenne slender and inserted far behind the middle, the 
antennal club oblong-ovate. Prothorax broad, transverse, rounded at the sides anteriorly, much narrowed 
and constricted in front, deeply sinuate at the base; somewhat closely punctate, the punctures on the 
disc transverse. Scutellum transverse. LElytra subtriangular, about the same width at the base as the 
elytra; narrowly punctate-striate, the interstices flat; and asperato-punctate. Beneath closely punctate. 
Prosternum armed with two very long, porrect, dorsally serrated spines, the space between them smooth 
and deeply sulcate to the transverse subapical fovea, on either side of which is another deep fovea. 
Anterior coxe separated by about their own width. Legs long; anterior tibie pilose within; tarsi rather 
broad, the bilobed third joint large, the anterior pair clothed with long fine projecting hairs, 
©. Rostrum very slender, flattened from near the base and almost smooth. 
Length 51-4, breadth 24-3 millim. 
6 
Hab. Costa Rica (U.S. Nat. Mus.: 2); Panama, Volcan de Chiriqui (Champion: ¢ ). 
Two specimens. A remarkable form and the only Central-American species with 
serrated prosternal spines aud a sagittiform rostrum in the male. 
4. Gerzus sinuatispinis, sp.n. (Tab. XIV. figg. 22, 22a, ¢.) 
Oblong, subrhomboidal, nigro-piceous, the antennz and prosternal spines obscure ferruginous ; thickly clothed 
with rather long, coarse, narrow, ochreous scales, which are transversely arranged on the prothorax, the 
elytra with an almost bare transverse black patch at the sides about midway between the base and apex. 
Head finely punctate, transversely grooved between the eyes; rostrum very long, strongly arcuate, 
irregularly striate-punctate, the basal portion carinate at the sides and slightly thickened, the antennze 
