232 RHYNCHOPHORA. 
feebly bidentate, the teeth on the anterior pair almost obsolete. Tarsi with joints 2 and 3 broadly 
dilated. 
Length 4, breadth 2? millim. (<.) 
Hab. Mexico, Teapa (H. AH. Smith). 
One specimen, evidently a male, the very long, slender, almost smooth rostrum 
notwithstanding. D. gracilirostris may be known from all the allied forms by the 
broadly dilated second and third tarsal joints. The prosternum is slightly depressed 
between the minute ante-coxal tubercles. 
17. Diastethus interruptus, sp.n. (Tab. XIII. fig. 14, ¢.) 
Subrhomboidal, broad, shining, castaneous, the rostrum and legs blackish; glabrous above and beneath. 
Rostrum long, moderately stout, smooth, the sides sparsely punctate at the base, the antenne inserted 
far behind the middle, the club acuminate-ovate. Prothorax rounded at the sides anteriorly, strongly 
constricted in front; the surface almost smooth, the anterior lobe with minute scattered punctures. 
Scutellum transverse. Elytra triangular, much wider than the prothorax, depressed along the suture, 
each with two abrupt, deep, transverse excavations on the disc (one below the shoulder, the other 
beyond the middle); deeply striate throughout, the strie feebly punctate, the interstices smooth. 
Beneath very sparsely punctate, the punctures on the pro-, meso-, and metapleura very coarse, those on 
the abdomen fine. Prosternal sulcus broad and deep, the anterior coxee distant. Femora unidentate. 
g. Prosternum armed with a rounded tubercle in front of each anterior coxa; first ventral segment 
flattened. 
Length 61, breadth 4 millim. (<¢.) 
Hab. Guatemata, Cubilguitz in Alta Vera Paz (Champion). 
One specimen. Not unlike D. didentatus, but with biplicate elytra, unidentate 
femora, and a broadly sulcate prosternum, the prosternum armed with two blunt 
tubercles in the male. 
18. Diastethus bidentatus, sp.n. (Tab. XIII. fig. 15, 2.) 
Subrhomboidal, convex, shining, black, the antenne ferruginous, the elytra and legs sometimes castaneous ; 
glabrous above, the pro- and metasternum and the anterior and intermediate coxw somewhat thickly 
clothed with yellowish-white or golden, hair-like, striated scales, the rest of the vestiture of the under 
surface, and that of the legs, very sparse and fine. Head sparsely, finely punctate; rostrum long, 
strongly arcuate, comparatively slender, thickened at the base, very sparsely punctate, the antenne 
inserted far behind the middle, the club ovate. Prothorax rounded at the sides anteriorly, strongly 
constricted in front, smooth, or with a few minute scattered punctures. Elytra triangular, depressed 
along the suture and each with a transverse excavation on the inner part of the disc beyond the middle ; 
deeply striate throughout, the striz obsoletely punctate, the interstices smooth and flat. Beneath sparsely 
punctate. Prosternal sulcus narrow, glabrous. Anterior cox narrowly separated. Femora sulcate and 
bidentate beneath. Tibia sinuate, dilated at the apex externally. 
g. Prosternum unarmed ; first ventral segment broadly excavate in the middle. 
Length 4,%,-7, breadth 27-4 millim. (¢ 2.) 
Hab. Muxico (coll. Solari), Playa Vicente and Santacomapan in Vera Cruz (Salle : 
é 2); Nicaragua, Chontales (Belt: 2); Panama, Bugaba (Champion: ¢ ). 
Eight specimens, one only of which is a male. Near D. pilipectus, with which it 
was confused in the Sallé collection, but readily recognizable by the glabrous scutellum, 
