250 RHYNCHOPHORA. 
pair unguiculate; and the body winged. Diaprepes* (type Curculio spengleri, L.) 
and Prepodes (type Curculio vittatus, L.) are sunk by Lacordaire as synonyms of 
Exophthalmus, but the former has well-developed vibrissee and the latter a conical, 
flattened prothorax, regularly 12-striate elytra, &c.; Hustales (type Curculio thunbergi, 
Dalm.) has a densely squamose triangular nasal plate, regularly 10-striate elytra, and 
strongly bowed, stout anterior tibia. Amongst the species now added to Exophthalmus 
—the type of which has a somewhat strongly exserted head and the base of the elytra 
lobate,—one (L. sulcicrus) has grooved tibie ; but as this insect is closely related to 
E. jekelianus, &c., it can remain in the same genus for the present. ‘The humeri 
are prominent in both sexes of EL. verecundus, interpositus, and roralis, obtuse in 
E. nicaraguensis, nubilus, lunaris, &c., and more prominent in the male than in the 
female of E. agrestis. ‘The sexes of the last-mentioned insect are so dissimilar that 
they have been described as separate species. All these forms, when fresh, are more 
or less coated (especially on the depressed portions of the upper surface) with an 
ochreous or yellow powdery exudation, which disguises the true colour of the 
scales and often hides the sculpture also; the scales, moreover, in some of the species 
(as in Megalostylus, &c.) vary in colour from metallic green to cinereous or white. 
The Central-American forms may be grouped thus :— 
a, Antennal scape widened from near the base; tibize feebly denticulate towards 
the apex: species large, sharply maculate. . . . . . . . . . . « Species 1. 
4. Antennal scape more slender, clavate at the tip. 
a’. Upper surface with or without short decumbent sete (the sete sometimes 
longer and erect towards the apex in E. jekelianus). 
a’, Tibiz not or obsoletely sulcate on their outer edge. 
a’, Tibiz not or feebly denticulate on their inner edge. 
a‘, Elytra not or moderately depressed anteriorly, not gibbous behind. 
a’. Prothorax with or without vittz, the elytra sharply fasciate with 
black and white scales; prothorax sinuate at the base: species 
very large 2. 6 1 ew ee we we ew ew ww.) Species 2, 3. 
b’. Prothorax obsoletely vittate and the elytra faintly fasciate with 
whitish, the scales on the rest of the surface reddish-brown ; 
the prothorax truncate at the base, the elytral strie interrupted 
in two places on the disc, the humeri prominent. . . . . , Species 4. 
c’. Prothorax and elytra with the scales uniformly coloured (green, 
bluish, cinereous, or white), the prothorax and elytra sometimes 
faintly vittate, or the elytra fasciate at the base, the seriate 
punctures on the latter fine or not placed in large fove. 
a°, Prothorax truncate at the base, the humeri very prominent . Species 5. 
b°. Prothorax and elytra more or less sinuate at the base (the 
alternate elytral interstices raised in typical #. carinirostris). Species 6-12. 
* Cf. anted, p. 180. 
