926 RHYNCHOPHORA. 
slender, inserted at about one-third from the base of the rostrum in the ?, and at some distance behind the 
middle in the ¢, the club rather small, ovate. Prothorax gradually narrowing to the short anterior lobe, 
moderately constricted in front, closely punctate. Scutellum strongly transverse. Elytra subtriangular, 
rather long, punctate-striate, the striz fine, the punctures oblong in shape, the interstices flat, faintly 
uniseriate-punctate. Beneath closely punctate, the punctures on the pleura coarse; prosternal sulcus 
deep; ventral segment 1 broadly depressed in the middle in the d. Femora feebly bidentate. Tarsal 
joints 2 and 3 broad. 
Length 5-52, breadth 22-31 millim. (¢ Q.) 
Hab. Mexico, Omilteme in Guerrero 8000 feet (H. H. Smith). 
One pair. A very beautiful insect, the cupreous portions of the upper surface 
gradually shading off into golden, and the golden into green. The fine alutaceous 
surface gives a silky appearance to the upper surface. 
4, Diastethus sulcipennis, sp. n. (Tab. XIII. figg. 4, 4a, 3.) 
Rhomboidal, shining, rufo-testaceous, the antennal club, knees, and tarsi infuscate; glabrous above and 
beneath. Rostrum moderately stout, strongly arcuate, much longer than the head and prothorax, 
smooth, the antenne inserted far behind the middle, the club acuminate-ovate. Prothorax conical, 
strongly constricted in front, smooth, the median lobe truncate behind. Scutellum transverse. LElytra 
triangular, the humeri broadly, subangularly dilated ; very deeply sinuato-striate, the strie obsoletely 
punctate, the interstices smooth and strongly convex, the alternate ones a little broader and more raised 
than the rest. Beneath almost smooth; prosternal sulcus very deep, narrow, the ridges terminating in 
a blunt tubercle in front of each coxa, the coxe narrowly separated; ventral segment 1 depressed down 
the middle. Legs smooth; anterior femora uni-, the others bidentate. 
Length 72, breadth 44 millim. (<¢.) 
Hab. Costa Rica, Tablazo 1700 metres (Biolley). 
One specimen, captured in Oct. 1904. A remarkably smooth form (perhaps black, 
when mature), with a conical prothorax, triangular, very deeply striate elytra, with 
dilated humeri and convex interstices, and deeply, narrowly sulcate prosternum. ‘The 
two short teeth on the intermediate and posterior femora are placed opposite one 
another on the edges of the shallow sulcus. JD. christophori (Boh.) has similarly 
convex elytral interstices. 
5. Diastethus pilipectus, sp.n. (Tab. XIII. figg. 5, 5a, 3 ; 5b, anterior tibia, ¢ ) 
Centrinus pilipectus, Chevr. in litt. 
Subrhomboidal, convex, shining, black, the antenne ferruginous; the scutellum on each side, the pro- and 
metasternum, the anterior and intermediate coxe, the inner face of the anterior femora, and the apices 
of the tibia, more or less densely clothed with long, golden, hair-like, striated scales; the rest of the 
upper surface bare, the abdomen with scattered minute hair-like scales. Head sparsely, finely punctate; 
rostrum strongly arcuate, long, slender, finely punctate at the base, and smoother thence to the apex, the 
antenne inserted at about the basal third or fourth, joint 2 of the funiculus a little shorter than L 
3 shorter than 2, the club rather long, acuminate-ovate. Prothorax convex, rounded at the sides, almost 
smooth, the basal margin and the anterior lobe with scattered punctures. Scutellum large, transverse. 
Elytra triangular, depressed along the suture, deeply striate throughout, the strie faintly punctate, the 
interstices flat and almost smooth. Prosternal sulcus very shallow, squamose. Ventral segments 
sparsely punctate. Femora shallowly sulcate beneath, and each armed with two more or less distinct 
tceth, the outer tooth on the intermediate pair acute and larger than the inner one, which is sometimes 
almost obsolete. Tibze sinuate, dilated at the apex. 
