GERZUS. 309 
interstice, the first with one line only, the vestiture of the under surface closer and whitish. Head 
closely punctate; rostrum arcuate, stout, striate and closely punctate, smoother at the tip in the 9, 
the antenne inserted at about the middle, the antennal club ovate. Prothorax short, arcuately narrowing 
from the base, feebly constricted in front; densely, finely punctate. Scutellum small, squamose. Elytra 
narrowly punctate-striate, the interstices rugulosely punctate. Beneath densely punctate. Prosternum 
unarmed, the transverse subapical groove deeply impressed in the middle and on each side behind the 
eyes. Anterior coxe narrowly separated. Legs short; anterior tibie with a short hook. 
Length 1,9,-23, breadth 1-13 millim. (¢ 2.) 
Hab. Costa Rica, Surubres, near San Mateo, 250 metres (Biolley: 3 ); Panama, 
Bugaba (Champion: ¢ ), Tabernilla, Canal Zone (Busck, in U.S. Nat. Mus.: 2). 
Five specimens, those from Costa Rica captured in February 1905. Near G. mendaz, 
but with the rostrum stouter and shorter. the vestiture finer, the scutellum closely 
squamose, the anterior tibie feebly unguiculate, the humeri less prominent *, The 
scales on the elytra are narrower than in G. farinosus, and not imbricate. 
101. Gerzeus breviculus, sp. n. (Tab. XVI. figg. 21, 21a, 2.) 
Subovate, short, convex, black or piceous, the rostrum in part or entirely and the antenne, tibix, and tarsi 
ferruginous; sparsely clothed with minute, hair-like, brown scales, the elytral interstices 3, 5, and 7 
each with a row of scattered, elongate, larger, white scales, the scutellum also albo-squamose ; the 
vestiture of the under surface sparse and white. Head closely punctate, the eyes very large and some- 
what narrowly separated; mandibles long and rather stout; rostrum stout, curved, about as long as the 
head and prothorax, striate and closely punctate in the ¢, shining and very sparsely punctate in the 9°, 
the antenne inserted at the middle, the antennal club oblong-ovate. Prothorax transverse, narrowing 
from the base, constricted in front; densely, finely, confluently punctate. Elytra much wider than the 
prothorax, subtriangular, deeply punctate-striate, the interstices roughly uniseriate-punctate. Beneath 
closely punctate ; first ventral segment broadly depressed in the middle in the ¢. Prosternum with 4 
median sulcus extending backward between the anterior coxe, which are separated by about one-half 
their own width. Anterior tibie sharply unguiculate in both sexes. 
Length 2,1,-24, breadth 14-1] millim. (d 9.) 
Hab. Mexico, Toxpam (Saiié); Guaremaua, Zapote (Champion); Panama, Bugaba, 
Volcan de Chiriqui (Champion). 
Three females and one male (the last-named from the Volcan de Chiriqui), varying 
a little in the sculpture of the prothorax. A short, convex, subovate form, with a 
rather long, stout rostrum, narrowly-separated eyes, and long mandibles, the scutellum 
albo-squamose, the alternate elytral interstices 3, 0, and 7 each with a scattered line 
of long white scales. 
102. Gerzeus nudipennis, sp. n. (Tab. XVI. figg. 22, 22a, ¢.) 
Rhomboidal, narrow, shining, black, the tarsi and the tip of the rostrum ferruginous ; the prothorax thickly 
clothed with long, hair-like scales, which are flavous on the disc and white along the sides and on the 
median lobe; the scutellum and elytra bare; the vestiture of the under surface very fine and whitish, 
coarser and pure white on the prosternum and on the meso- and metasternal side-pieces. Head finely 
punctate, foveate between the eyes ; rostrum strongly arcuate, longer than the head and prothorax, stout 
and punctured at the base, the apical half flattened, smooth, and more slender, the autennee inserted far 
behind the middle (at the basal third in the 9), the antennal club short-ovate, stout, Prothorax 
transverse, conical, constricted in front ; densely, finely punctate. Elytra rather convex, comparatively 
* Centrinus brunnirostris, Kirsch, from Peru, is a nearly allied form, with denser, finer vestiture, a longer 
rostrum, &c. 
