GEREUS. 300 
the vestiture of the under surface coarse, close, and white. Head finely punctate; rostrum (¢) a little 
longer than the head and prothorax, curved, moderately stout, squamose and closely punctate in its basal 
half, and flattened, bare, and sparsely punctate thence to the tip, (Q ) slender, thickened at the base and 
flattened and almost smooth thence to the apex, the antennw inserted at (¢) or far behind ( 2 ) the 
middle. Prothorax short, subconical, densely punctate. Elytra subtriangular, finely punctate-striate, 
the interstices roughly punctate. Beneath densely punctate ; first ventral segment broadly depressed 
down the middle in the ¢. Prosternum slightly hollowed down the middle in the ¢, flat in the 2. 
Femora clothed with long fine hairs beneath in the g. ‘Tibiee in the ¢ strongly, in the 2 more feebly 
unguiculate, the anterior pair with a few long hairs in the ¢. 
Length 23-21, breadth 1,45 millim. (d 2.) 
Hab, Mexico, Chilpancingo in Guerrero 4600 feet (H. H. Smith). 
One pair, the female in very fresh condition. Perhaps an extreme form of 
G. varipes, with the vestiture much coarser above and beneath, and differently 
coloured on the elytra, the interstices of the latter more rugose. ‘The rostrum of 
the male is somewhat flattened and bare in its apical half. 
92. Gerzeus tenuescens, sp. n. 
Oblong-subrhomboidal, narrow, nigro-piceous, the apices of the tibie and the mandibles more or less 
ferruginous; above somewhat thickly clothed with very small, narrow, brown and whitish scales, the 
brown scales on the prothorax occupying a broad space on each side of the whitish median line and those 
on the elytra mainly confined to a large common subtriangular patch on the anterior half, the elytral 
vestiture arranged in a single line down the whole length of the first interstice and in two lines on the 
others; the vestiture of the under surface close, uniform, and whitish. Head sparsely punctate ; 
rostrum a little longer than the head and prothorax, curved, moderately stout and closely punctate, in 
the 2 much smoother and flattened towards the tip, the antenne inserted at ( ¢ ) or slightly behind ( 2 ) 
the middle, the antennal club ovate. Prothorax short, conical, narrow, constricted in front; densely, 
finely punctate. Scutellum squamose, Elytra comparatively long, much wider than the prothorax, 
gradually narrowing from the base ; sharply punctate-striate, the interstices finely punctulate. Beneath 
densely punctate ; first ventral segment slightly depressed down the middle in the g. Prosternum 
unimpressed behind the transverse subapical groove. Tibie strongly, in the 2 more feebly, unguiculate. 
Length 22, breadth 1 millim. (oc Q.) 
Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith). 
Two males and one female. Smaller and narrower than G. longiusculus, with a. 
relatively shorter and narrower prothorax, the vestiture finer and arranged in two lines 
down each elytral interstice, the first excepted. 
98 Gerzus leucomelas, sp. n. - (Tab. XVI. figg. 18, 184, 2.) 
Rhomboidal, narrow, shining, black, the tip of the rostrum ferruginous ; clothed above with narrow white 
‘and smaller blackish scales, the white scales on the prothorax condensed into a broad marginal and a 
narrow median stripe, and those on the elytra (which are arranged in one or two rows down each 
interstice) clustered into various narrow streaks at the base and apex, a short stripe on the suture below 
the base, and an interrupted post-median fascia ; the under surface densely albo-squamose. Head finely 
punctate; rostrum strongly bowed, slender, much longer than the head and prothorax, almost smooth, 
the antenne inserted slightly behind the middle, the antennal club ovate. Prothorax short, constricted 
in front, narrowing from the base; densely, confluently punctate. Elytra triangular, separately rounded 
at the apex; sharply punctate-striate, the interstices sparsely punctulate. Beneath densely punctate, 
BIOL. CENTR.-AMER., Coleopt., Vol. IV. Pt. 5, May 1908. 2 RR 
