632 RHYNCHOPHORA. 
the base, with ten rows of punctures ; mesosternum raised, very prominent, feebly arcuate-emarginate 
in front; metasternum rather long, the episterna broad; ventral segment 2 very little longer than 3, 
the sutures almost straight: legs short and stout, the anterior pair a little longer than the others; femora 
feebly unidentate ; tibiae compressed ; tarsi with joint 3 broad and strongly bilobed, 4 comparatively 
short, the claws minute and approximate. 
A single species is referred to Zrachalus. Its chief characters are: the com- 
paratively short fourth tarsal joint, the minute, narrowly separated claws (much as 
in various Acailles), the very short, stout, feebly curved rostrum, the large, partly 
exposed eyes, the deeply sinuate base of both the prothorax and the elytra, and the 
minute, narrow scutellum. 
1. Trachalus micronychus, sp.n. (Tab. XXXI. figg. 6, 6 a.) 
Subovate, dull, nigro-piceous, the antenne ferruginous; thickly clothed with small brown scales, the 
prothorax with a cruciform patch on the disc, and the elytra with a broad, common, attenuate, patch 
extending downwards from the base, more or less cinereous (the elytra in the specimen from the 
Rio Hondo blackish, with a triangular, pallid dorsal patch), the femora at the base and the under 
surface in great part cinereous; the upper surface also set with very short, scattered, erect sete, which 
become more crowded on the dorsal elevations of the elytra and on the two small prominences at the 
apex of the prothorax. Head densely, finely punctate, the eyes rather narrowly separated ; rostrum 
rugosely punctate and squamose to the tip (except along the median line) in the g, the apical portion 
bare and more sparsely punctate in the Q; joints 3-7 of the funiculus transverse. Prothorax narrowed 
from near the base, feebly constricted in front, the hind angles obtuse; densely, finely punctate, flattened 
and faintly carinate down the middle, obsoletely binodose at the apex. Elytra narrowing almost from 
the base, the humeri obliquely truncated in front; seriate-punctate, the punctures distant one from 
another, the interstices closely punctulate, 3, 5, 7, and 9 raised, the ridge on 3 and 5 prominent and 
here and there interrupted, the suture also swollen at about one-third from the apex. Beneath densely 
punctate. 
Length 43-43, breadth 2-21 millim. (¢ 2.) 
Hab. Brivis Honpuras, Rio Hondo (Blancaneaux: 2); PANaMa, Bugaba (Cham- 
pion: 3). . 
Two specimens, both with the vestiture somewhat abraded, the one from the 
Rio Hondo perhaps discoloured. 
PTOUS, gen. nov. 
Head convex; rostrum feebly curved, about as long as the prothorax, widened and depressed at the base, the 
antenn inserted behind the middle, the funiculus 7-jointed, the club ovate, the scrobes oblique, lateral ; 
eyes exceedingly large, subcontiguous; prothorax slightly longer than broad, subtruncate at the base, 
arcuate at the apex, with feebly-developed ocular lobes; scutellum small ; elytra long, wider than the 
prothorax, with ten rows of punctures; rostral canal deep; mesosternum raised, horseshoe-shaped ; 
metasternum moderately long, the episterna broad; ventral segments 1 and 2 rather convex, Y as long 
as 3 and 4 united, the first suture arched ; legs long and slender ; femora feebly clavate, unidentate, the 
posterior pair reaching the apex of the elytra; tibiee almost straight, the terminal claw arising from the 
outer angle; tarsi narrow, joint 1 as long as 2 and 3 united, 3 bilobed, the claws small, simple, divergent ; 
body elongate-ovate, narrow, laterally compressed, sparsely squamose. 
The single species included under this genus has the general shape of Tyloderma 
eneotinctum and its allies, and the shining black body and sparse white vestiture of 
an Otidocephalus. In the very large, subcontiguous eyes it approaches the Zygopina. 
