240 RHYNCHOPHORA. 
down the middle, and sometimes transversely depressed towards the base, the latter bisinuate ; finely 
punctate, with coarser punctures intermixed. Scutellum not visible. Elytra broad, moderately long, 
sinuate at the base, the humeri obliquely truncated, the apices acuminate and dehiscent ; with rows of 
coarse scattered punctures, the tenth row obsolete for some distance before the middle, the interstices 
closely punctulate. Fifth ventral segment with an oblique impressed line on each side in front in 2. 
Legs comparatively short, stout, the tarsi broad, the anterior tibise sharply unguiculate in both sexes. 
Length 73-12, breadth 27-53 millim. (¢ 2.) 
2 
Hab. Mexico, Temax in N. Yucatan (Gaumer). 
Sent us in abundance by Gaumer, the specimens varying in size and in the 
development of the markings. Easily recognizable by the shining surface, and the 
bifasciate elytra, with the seriate punctures widely separated one from another. 
TETRAGONOMYUS, gen. nov. 
Rostrum broad, flattened, oblongo-quadrate, emarginate at the apex, with a large, triangular, depressed, 
rugose, bare nasal plate, which extends backwards to between the points of insertion of the antennee and 
is limited on each side by an oblique ridge, the scrobes lateral, sinuous, deep, running downward to 
beneath the eyes, the latter convex, strictly lateral, very prominent ; antennal scape not extending beyond 
the eyes, flattened, rapidly widened outwards, slender at the base, joint 2 of the funiculus much longer 
than 1, 3-7 obconic, the club stout, acuminate-ovate; mentum large, covering the maxilla; mandibular 
scar placed on the lower surface ; prothorax subcylindrical ; scutellum very small, triangular ; elytra broad, 
oblongo-subquadrate, set with large tubercles, 10-striate, the outer strie contiguous from about the basal 
third, the lower margin strongly sinuate; femora clavate, unarmed; anterior tibie dilated, strongly 
bisinuate within, sharply unguiculate at the tip; posterior tibie narrowly laminate at the apex, the 
glabrous articular surface ascending and denscly ciliate externally; tarsal claws free; body oblong, 
winged, squamose, covered with an earthy exudation. 
Type, 7. tuberosus. 
Amongst the Tropical-American genera with a broad, subquadrate rostrum, and 
laterally placed, very prominent eyes, Tetragonomus may be known by the large, 
triangular, depressed, rugose nasal plate, the subcylindrical prothorax, the broad, sub- 
quadrate, strongly tuberculate elytra, and the dilated, deeply sinuate anterior tibie. 
The single species referred to this genus has the appearance of a subcortical insect, 
and it may have been found under bark. 
1. Tetragonomus tuberosus, sp.n. (Tab. X. figg. 21, 21 a.) 
Oblong, black or piceous, the funiculus and tarsi reddish ; coated with a dull brown earthy-looking exudation, 
which partly hides the small, closely placed, reddish-brown scales, the elytral tubercles with a few setiform 
scales, the legs strongly setose, the setee becoming more crowded on the anterior tibiee. Head and rostrum 
densely, rugulosely punctate, finely sulcate to the nasal plate, the rostrum parallel-sided and a little longer 
than broad. Prothorax transverse, slightly narrowed in front, bisinuate at the base, the hind angles 
rather sharp and extending backwards ; transversely wrinkled and irregularly punctate. Elytra nearly 
twice as broad as the prothorax, flattened and subparallel to beyond the middle, and then abruptly 
declivous and obliquely narrowing to the apex, deeply sinuate at the base, rather coarsely seriate- 
punctate; each elytron with about ten large tubercles—one on the third interstice below the base, 
one on the shoulder, two oblique series across the disc (the tubercle on 3 at about one-third from the 
apex very large), and two placed transversely near the apex. Intermediate tibie with a rather long 
uncus in ¢. 
Length 63-74, breadth 24-27 millim 
