GASTEROCERCUS.—TRACHALUS. 631 
2. Gasterocercus hypsophilus. 
?. Gasterocercus hypsophilus, Kirsch, Berl. ent. Zeitschr. 1869, p. 197°. 
Hab. Nicaragua, Chontales (Belt).—CotomBiA, Bogota!. 
A single worn female specimen from Chontales is apparently referable to this 
species. It has the elytra more coarsely granulate than in G. propugnator. 
ISUS, gen. nov. 
Rostrum very stout, feebly arcuate, widened towards the base and apex, the antenne stout, inserted at about the 
middle, the funiculus 7-jointed, the club oblong-ovate ; eyes large, distant, finely facetted; prothorax 
transverse, sinuate at the base, with feebly-developed ocular lobes ; scutellum subquadrate, filling the 
cavity ; elytra oblong, slightly wider than the prothorax, sinuate at the sides beneath, interruptedly seriate- 
punctate, with six or seven punctures only in the tenth row, the interstices nodose ; mesosternum broad, 
prominent, arcuate-emarginate ; metathoracic episterna broad; ventral segments 2-4 subequal in length ; 
legs stout ; femora unidentate; anterior tarsi of the d with joints 1 and 2 dilated and clothed with 
long, coarse, projecting hairs on the inner edge, the anterior tibia also slightly elongated in this sex. 
Type, I. M-nigrum. 
The single species referred to this genus is related to Gasterocercus. It is one of 
the few American Cryptorrhynchids with the anterior tarsi of the male both dilated 
and ciliated. 
1. Isus M-nigrum, sp.n. (Tab. XXXI. figg. 4, 4a, ¢.) 
Oblong-ovate, robust, black ; densely clothed with small cinereous or whitish scales, the upper surface and 
legs variegated with brown, the elytra with a common, transverse, M-shaped mark at the base, the 
outer branches of which extend obliquely forwards on to the base of the prothorax, a triangular patch 
at the middle of the disc of each, and a streak on the suture towards the apex, black or brownish-black, 
the scutellum white. Head rugosely punctate; rostrum about as long as the prothorax, rugosely punctate 
to the tip, joints 1 and 2 of the funiculus subequal in length. Prothorax abruptly narrowed and 
constricted in front, the sides subparallel at the base; coarsely punctate, the disc feebly binodose at 
the middle and also at the apex, broadly depressed down the centre, and with a short median carina. 
Elytra subparallel in their basal half, somewhat gibbous, the humeri obliquely truncated ; coarsely, 
interruptedly, seriate-punctate, the interstices rugulose and uneven, set with numerous tubercles and 
subconical elevations, the third with a prominent, stout, interrupted ridge. Beneath densely punctate. 
Length 93-11, breadth 43-575 millim. (¢ Q.) 
Hab. Guatemata, San Isidro, Pacific slope (Champion). 
One pair. This insect seems to be related to Cryptorhynchus rudis, Ros., from 
Brazil. It has the entire surface so densely squamose that the sculpture is in great 
part hidden, both above and beneath. The whitish vestiture is condensed into an 
irregular X-shaped mark on the elytra and a broad median band on the prothorax. 
TRACHALUS, gen. nov. 
Rostrum very stout, feebly curved, shorter than the prothorax, the antenne inserted at (¢) or slightly 
behind ( @ ) the middle, with the funiculus 7-jointed, and the club ovate, with transverse sutures ; head 
visible from above; eyes very large, in great part exposed ; prothorax transverse, deeply bisinuate at the 
base, the hind angles received into the excavate base of the elytra, the ocular lobes almost obsolete : 
scutellum minute, narrow ; elytra rather short, much wider than the prothorax, strongly trisinuate at 
