302 RHYNCHOPHORA. 
1. Cydianirus argenteus. (Tab. XIV. figg. 6, 6 a.) 
Cydianerus argenteus, Boh. in Schénh. Gen. Cure. v. p. 741 *. 
Polydius donceli (sic), Bovie, Ann. Soc. Ent. Belg. lii. p. 43 (1908)*; Wytsman’s Gen. Ins., 
Entimine, p. 4, t. 1. fig. 6°. 
Length 72-114, breadth (at shoulders) 33-53 millim. 
Hab. Mexico (coll. Chevrolat!), Tehuantepec (Sallé), Rincon Antonio in Oaxaca 
(Knab, in U.S. Nat. Mus.); Honpuras (Mus. Brit.); Costa Rica?%, Guanacaste 
(Pittier), Turubares, 500 metres, Pacific slope (Biolley), Piedras Negras (U.S. Nat. 
Mus.). 
I have seen a dozen examples of this species, including M. Bovie’s type of 
P. donceli, this latter scarcely differing from one of the Mexican specimens compared 
long ago by Dr. Sharp with the type of C. argenteus. When fresh the surface 1s 
densely clothed with silvery, whitish, or flavo-cinereous scales, the oblong seriate 
punctures on the elytra thus appearing smaller and narrower than in rubbed 
individuals. The Honduras specimen is figured. 
HYPOPTUS. 
Hypoptus (Jekel), Lacordaire, Gen. Col. vi. p. 271 (1863). 
The principal characters of this genus (described by Lacordaire from females only) 
are as follows :— 
Rostrum widened at the apex, emarginate at the tip, the nasal plate reduced to a very short v-shaped piece, 
the scrobes long, deep, obliquely descending to beneath the eyes, the latter large, depressed, transversely 
oval; mentum large, flat, filling the buccal cavity; mandibles with a large scar in front; antennal 
scape not extending beyond the anterior margin of the eyes; prothorax with large, rounded ocular 
lobes; scutellum well developed; elytra much broader than the prothorax, oblong-subtriangular in dg, 
subparallel in their basal half in 9, 10-striate, the outer striae free, the humeri prominent; femora 
clavate, unarmed; tibiee feebly serrulate, unguiculate in ¢, without visible uncus in 2, the posterior 
pair broadly laminate and squamose at the apex, and with the glabrous articular surface rather large 
and moderately excavate; tarsal claws free; body oblong, squamose, fully winged. 
Type, H. macularis, Lacord. (inedit.). 
Hypoptus was based upon a very variable Central-American and Colombian insect, 
the three so-called species being varieties of one only; a second, however, is known 
to me from the Lesser Antilles*. They have much the facies of Alophus, a genus 
belonging to the true Curculionine and wanting the mandibular scar. 
* Hypoptus insularis, sp. n—o. Broader than H. macularis (3), the prothorax with two narrow 
sinuous lines on the disc, and the elytra each with two small, obliquely placed, sharply defined spots at 
about the middle, whitish, the scales on the rest of the upper surface coppery-brown, those along the 
sides, legs, and under surface intermixed with white, the femora subannulate; the rostrum faintly or 
obsoletely carinate to the oblong inter-ocular fovea, joint 2 of the funiculus longer than 1; prothorax 
much broader than long, densely, confluently punctate, granulate on the disc; elytra relatively shorter 
and broader, and with less prominent humeri than H. macularis (3), coarsely punctate-striate, the 
