304 RHYNCHOPHORA. 
CNAGIUS, gen. nov. 
Mandibles curved, slightly decussate at the tip; rostrum. stout, curved, received in repose into the very deep 
smooth prosternal sulcus, the walls of which are greatly raised, almost straight, and continued along 
the posteriorly-produced portion of the prosternum, the mandibles received into a smooth fovea in the 
front of the metasternum ; eyes very large, narrowly separated ; antenne inserted at the middle of the 
rostrum, the club ovate; head convex, large; prothorax subconical, constricted in front; scutellum 
small, free; elytra subtriangular; pygidium not visible; anterior coxe separated by a little less than 
their own width, hollowed within; legs short, femora stout, sulcate along the greater part of their 
length beneath, tibie feebly unguiculate, tarsal claws contiguous at the base; body oblong-elliptic, 
narrow, polished, sparsely squamose. 
Type, C. cavipectus. 
The type of this genus has the general facies of Colothus, but the sternal structure 
is very like that of Coleomerus, Coleomeropsis, and Amercedes. The rostrum in 
repose is received into a very deep, broad, polished groove in the prosternum (the 
walls of which are neither sinuous as in Coleomerus, nor converge posteriorly as in 
Coleomeropsis), and the mandibles also are received into a fovea in the metasternum. 
The head is larger than in Coluthus, and the antenne, rostrum, mandibles, &c. are 
differently formed from those of Amercedes. We have here one of those Barids with 
the rostral canal of a Cryptorrhynchid. 
1. Cnagius cavipectus, sp.n. (Tab. XVII. figg. 17, 17 a, b, 2.) 
Shining, black ; clothed above with short, scattered, semierect, blackish, hair-like scales intermixed with a 
few coarser, adpressed, elongate, pure white scales, these latter condensed into a short streak at the base 
of the suture and an incomplete line along each of the alternate elytral interstices ; the under surface 
and legs rather sparsely set with pure white, hair-like scales. Head closely punctate, dull; rostrum 
about as long as the head and prothorax, subcarinate and closely striato-punctate, a little longer and 
smoother in the 9. Prothorax broader than long, narrowing from the base; pitted with large, deep, 
rounded punctures, except along a rather broad smooth median space. Elytra sharply and narrowly 
striate, the interstices uniseriate-punctate. Beneath closely punctate; first ventral segment broadly 
flattened down the middle, and the fifth slightly depressed in the centre, in the ¢. 
Length 31-33, breadth 13 millim. (6 2.) 
Hab. Mexico, Teapa (H. H. Smith); British Honpuras, Belize (Blancaneauz). 
Two specimens. 
COLUTHUS, gen. nov. 
Mandibles toothed on their inner edge, decussate ; rostrum curved, very stout, not or very little longer than 
the prothorax, the antenne inserted at the apical third or fourth, the antennal club ovate ; head convex, 
rather small; prothorax shortly tubulate in front; scutellum small, transverse, free; elytra oblong- 
subtriangular, blunt at the apex; pygidium not visible; prosternum deeply sulcate, the sulcus limited on 
each side by a sharp ridge, which terminates in a tubercle in front of the coxal cavity ; anterior coxe 
large, exserted, narrowly separated, hollowed within, the depression limited above by a short ridge; 
femora stout, the intermediate and posterior pairs suleate along their outer half beneath, the anterior 
pair excavate at the apex only; tibie strongly unguiculate; tarsal claws free; body elongate- 
rhomboidal, flattened and strongly sculptured above, squamose. 
Type, C. eribrarius. 
The above characters are taken from a single variable species, which is not uncommon 
in Guatemala. The prosternal sulcus in this insect is continued between the coxe, and 
