320 RHYNCHOPHORA. 
XII. STENOCERUS. 
Anthribus, Germar (nec Fabricius, 1792), Ins. Spec. Nov. p. 174 (1824). 
Stenocerus, Schoenherr, Cure. Disp. Meth. p. 89 (1826) (type: fulvitarsis) ; Jekel, Ins. Saund. i. 
p. 100 (1855) ; Lacord. Gen. Col. vii. p. 523 (1866) ; Gemm. & Harold, Cat. Col. ix. p. 2780 
(1872) (partim). 
Range: South and Central America. 
3 &. Rostrum flat, rather thin, more or less gradually dilated apically. Antennal groove subventral, covered, 
oblong, about midway between eye and base of mandible, generally somewhat nearer the latter. Under lip 
broadly bilobate, not divided down to the insertion of the labial palpus. Lye lateral, slightly oblique, 
elliptical. Antenna thin, club loose, flat, segments 10 and 11 thin at base as if shortly stalked, all 
“segments with long bristles; segment 3 longer than 1+2 and than 4, 8 the shortest, 9 and 10 truncate, 
cordiform, 11 elongate-elliptical, subacuminate. Pronotum conical, widest just before the base at the 
curve of the carina; the latter flexed forward at sides, approaching base in middle. Elytra about half 
as long again as broad, or less. 
As pointed out by Lacordaire, the division of Stenocerus into groups according 
to differences in the shape of the prothorax and elytra, as attempted by Jekel (J. c.), 
cannot be relied upon, and he calls attention to the diversity in the development of 
the mesosternal process. The shape of this process, coupled with distinctions in the 
rostrum, sufficiently distinguishes the members of this genus. ‘The characters, too, 
upon which Jekel based the majority of his species are unstable. Fortunately the 
types of his Stenoceri, with the exception of blanchardi, are preserved in the British 
Museum, so that I have been able to compare them. 
As we do not know nigrotessellatus, Blanch. (1843), and blanchardi, Jekel (1855), 
they are not included in the following key. 
a. Rostrum with conspicuous mesial carina . . . . . . ee ee wee 
Rostrum without mesial carina, mesially impressed . . . . . . 2... Gh 
6. Intracoxal lamella of prosternum projecting beyond coxe, not notched between 
coxee ; mesosternal process higher than coxe, concave in front, rounded at 
apex, with the anterior margin entire or feebly sinuate. . . . . . . . G 
Intracoxal lamella of prosternum not notched between coxe, not projecting 
beyond them; mesosternal process twice as broad as high, vertical, not concave 
infront. 2... . e+ 6 6 ee ew. [paraguayensis, Jord. (1895); Paraguay.] 
Intracoxal lamella of prosternum not projecting beyond hinder side of coxe, 
notched between them; mesosternal process not higher than cox, concave 
from base to apex, therefore appearing bituberculate . . . ....~;, Species No. 2. 
c. Mesosternal process entire at apex; pronotum black, with or without large 
luteous area from base forward. . . . . 2. 6 1 ee - « . « Species No. 1. 
Mesosternal process feebly sinuate at apex; prothorax brownish-black, spotted 
with velvety-black . . . . . . . . . . [fulvitarsis, Germ, (1824) ; South Axmerica. | 
