384 RHYNCHOPHORA. 
metasternum coarse, the propleura finely, obliquely strigose. Prosternum with two shallow oblique 
sulci. Femora shallowly sulcate, the anterior pair broadly, feebly dentate. Anterior tibiew sinuous, 
slightly dilated beyond the middle within. 
Length 32, breadth 14 millim. ( 9.) 
Hab. Mexico, Jalapa (J. 7. Mason, in U.S. Nat. Mus.). 
One female. Differs from the small allied species in its oblong, elliptic form (7. é. in 
having the prothorax less dilated) and somewhat elongate elytra. The anterior 
femora are angularly dilated rather than toothed. 
ACANTHOMADARUS, gen. nov. 
Rostrum very stout, strongly arcuate, about three-fourths the length of the body, the antenne inserted beyond 
the middle, the scrobes confluent beneath and continued as a deep sulcus to the base; mandibles stout, 
notched within, strongly decussate; head globose, rather small; eyes finely facetted, moderately large ; 
prothorax subquadrate, very abruptly narrowed and tubulate in front, deeply bisinuate at the base, the 
median lobe impinging on the narrow cresceuatiform scutellum; elytra oblong-subtriangular, not wider 
than the prothorax; pygidium large, fully exposed, subvertical; prosternum declivous, unimpressed in 
front, the basal process armed with a very large, erect, compressed, conical protuberance ; anterior coxe 
widely separated; mesothoracic epimera large, partly visible from above; meso- and metasternum 
connate, the narrow exposed portion of the former on the same plane as the latter; legs short; femora 
moderately clavate, unarmed ; tibie strongly unguiculate ; tarsi rather slender, the claws long, narrowly 
separated at the base; body robust, oblong or cuneiform, glabrous, polished. 
Type, A. dirus. 
This genus includes a single species, remarkable on account of the stout, erect, 
conical protuberance on the basal process of the prosternum and the anteriorly dilated 
sides of the prothorax. A. dirus has somewhat the facies of Ganymela nitida, Pasc., 
but it is closely related to Madarus. 
1. Acanthomadarus dirus, sp.n. (Tab. XIX. figg. 16, 16a, ¢.) 
Cuneiform (¢) or oblong (2), nigro-piceous or black, very shining. Head very sparsely, finely punctate, 
transversely grooved between the eyes ; rostrum sparsely punctate, shallowly sulcate at the sides, a little 
smoother in the 9, the antenne inserted at about the apical three-fifths, the joints of the funiculus 
stout and closely articulated, widening outwards, the club acuminate-ovate. Prothorax transverse, 
parallel at the sides to near the apex and then abruptly narrowed, the angle thus formed obliquely 
truncated or obtusely produced; the surface with very fine, widely scattered punctures. Elytra 
moderately long, concave and somewhat uneven on the disc, and more or less depressed along the suture, 
the subapical callosities prominent; very finely punctate-striate, the striae scarcely visible on the disc 
(the sutural one excepted), the interstices flat and with a few scattered excessively minute punctures. 
Pygidium densely punctate. Beneath sparsely punctate, the declivous portion of the prosternum with 
coarse foveiform impressions. Anterior tibia sinuate within, strongly unguiculate at the oater apical 
angle and with a small tooth at the inner apical angle. 
Length 64-74, breadth 22-3} millim. (¢ 9.) 
Hab. Panama, Bugaba, Tolé (Champion). 
Three specimens: the two from Bugaba (¢ ?) have a broad, strongly transverse 
prothorax, with the swollen subapical lateral portion obliquely truncated; the one from 
Tolé (2%) has a rather smoother rostrum, and a narrower, less transverse prothorax, 
