446 RHYNCHOPHORA. 
tibie carinate, subangularly dilated and more or less serrate at the base externally, obliquely truncate 
at the apex, feebly unguiculate at the inner apical angle; tarsi with joint 3 strongly bilobed, the claws 
toothed. 
This genus includes a few small Tropical-American forms which bear a remarkable 
superficial resemblance to certain Oncorrhini of the group Anchonina, the peculiar dull 
upper surface, the almost smooth, globose head, the somewhat depressed eyes, &c., 
being here reproduced amongst the Ithyporides. The prosternal ridges in these 
insects extend beyond the anterior coxe, and are received between the sides of the 
mesosternum and the hollowed inner portions of the intermediate coxe. I have seen 
one or two unnamed S.-American species that probably belong to Hatus. 
a. Eyes narrowly separated; rostrum somewhat gibbous at the base, stout ; 
prothorax carinate or with a smooth median space; elytra simply setose ; 
tarsal claws strongly toothed. ; 
a'. Prothoracic sculpture exceedingly coarse; elytra transversely depressed 
and constricted below the base, the alternate interstices costate . . . ebeninus, sp. n. 
b'. Prothoracic sculpture finer; elytra without distinct depression below the 
base. 
a", Median carina of the prothorax widening forwards; alternate elytral 
interstices costate 2. 1. 1. we eee ee ee ew we rugicollis, sp. 0. 
b". Median carina of the prothorax narrow throughout ; all the elytral 
interstices more or less costate . . . . . . we ee ee) CoStulatus, sp. n. 
6. Eyes larger and contiguous ; rostrum depressed at the base, more slender ; 
prothorax not carinate ; elytra setose and also clothed with narrow scales, 
the alternate interstices costate; tarsal claws feebly toothed . . . . . vestitus, sp. n. 
1. Matus ebeninus, sp.n. (Tab. XXII. figg. 8, 3a.) 
Subovate, deep black, the antennz and the tips of the tarsi reddish ; opaque above, the elevated portions of the 
surface only shining ; clothed with widely scattered, rather long, semierect, ochreous sete. Head almost 
. smooth, the eyes depressed and very narrowly separated; rostrum stout, strongly curved, a little longer 
than the prothorax, somewhat gibbous at the base, shallowly sulcate and rugulose at the sides, with a 
raised smooth space down the middle, the antenne inserted at about one-third from the tip, joints 3-7 of 
the funiculus transverse. Prothorax strongly transverse, deeply bisinuate at the base, abruptly narrowed 
and constrieted immediately before the apex, the sides slightly sinuate; exceedingly coarsely, confluently 
punctate, the interspaces raised into longitudinal or sinuous ruge, the smooth median space dilated at the 
middle. Elytra about one-half wider than the prothorax, somewhat cordate, constricted at the sides 
below the rounded humeri, transversely depressed below the base, the latter sinuate; seriate-punctate, 
the punctures oblong in shape and placed in shallow striz, the interstices 3, 5, and 7 finely and narrowly 
costate, the others also finely costate at the base. Beneath coarsely punctate, the ventral segments 3 
and 4 each with a single transverse row of punctures. Legs very coarsely punctate, the punctures on 
the femora and tibie separated by longitudinal rug; anterior femora distinctly, the others obsoletely, 
unidentate ; tibia serrate at the base externally, the intermediate pair strongly sinuate on the outer edge ; 
tarsal claws with a sharp tooth. 
Length 33-33, breadth 23-21 millim. 
Hab. Panama, Volcan de Chiriqui 2500-4000 feet (Champion). 
