404 RHYNCHOPHORA. 
of the prosternum in a line with the posterior margin of the anterior cox, the first 
ventral segment slightly flattened or depressed in the middle, and the rostrum usually 
a little more distinctly punctured at the apex than in the females. In one of the new 
forms now added, G. spinigera, the median carina of the prothorax in the fully- 
developed male is produced into a long, stout, smooth, spiniform process, which 
covers the scutellum and extends some distance along the suture; and in another, 
G. simplex, the coarse punctures on the prothorax are rounded and not confluent. 
.The prosternal depression is triangular, opaque, and flattened at the bottom, extending 
narrowly backward between the coxe and becoming confluent anteriorly with the two 
widely-separated subapical foveee; the pygidium is vertical, very short, not visible 
from above ; and the mandibles do not overlap at the apex when closed. ‘The species 
known to me may be separated thus :-— 
a. Prothorax coarsely, rugosely punctate, the narrow raised interspaces 
longitudinally or sinuously confluent. 
a’. Elytra with finely punctured striz, the dorsal interstices confusedly 
punctate at the base, the outer ones narrowly, interruptedly costate; 
rostrum carinate at the base. 
a’. Median carina of the prothorax not produced in the ¢; elytra 
more uneven and with the vestiture sparser and more scattered . rugata, Boh. 
b>. Median carina of the prothorax produced posteriorly into a long 
stout spine in the fully-developed ¢; elytra less uneven, with the 
vestiture more crowded on the basal half . . . . . 2. . . spinigera, sp. n. 
b’. Elytra with more coarsely punctured or deeper strie, the interstices 
uniseriate-punctate, the outer ones narrowly, uninterruptedly cos- 
tate, the surface flattened, with very sparse vestiture. 
c’, Prothorax obliquely narrowed, very coarsely sculptured; elytra 
shining, the interstices with coarse scattered punctures. . . . solarii, sp. n. 
d*. Prothorax rounded at the sides, less coarsely sculptured ; elytra 
dull, the interstices with closely placed punctures. . . . . [rugicoliis, Kirsch. | 
6. Prothorax less coarsely punctate, the raised lines more closely placed ; 
elytra flattened, with finely punctured striz, the dorsal interstices con- 
fusedly punctate at the base, the outer ones faintly costate. . lecontei,n.n. (rugicollis, Lec.). 
c. Prothorax shallowly punctate, the raised sinuous lines fine and closely 
placed. 
c’. Elytra strongly nodose, the vestiture scattered and fasciculate; pro-, 
meso-, and metapleura very coarsely sculptured . . . . . . . ([evulsa, Kirsch. ] 
d’, Elytra feebly nodose, the vestiture condensed on the basal fourth ; 
pro-, meso-, and metapleura more finely and densely sculptured* . [ iturata, F.] 
d. Prothorax with closely placed rounded punctures, separate one from 
another on the disc; elytra flattened, finely striate, the vestiture 
somewhat dense on the basalhalf . . . . 2. . . © 1. 1). . simplex, sp. D. 
* Characters teken from a specimen from Cayenne in British Museum. 
