234 RHYNCHOPHORA. 
humeri rounded and prominent; sharply striate throughout, the strie obsoletely punctate, the interstices 
smooth and flat. Pro-, meso-, and metapleura coarsely, the rest of the under surface more finely, 
punctate ; prosternal sulcus shallow, rather broad, the anterior coxe distant ; ventral segment 1 slightly 
depressed in the middle in the ¢. Femora clavate, coarsely punctate, the intermediate and posterior 
pairs sharply dentate, the anterior pair without distinct tooth. Tarsal claws small, subconnate. 
Var. Smaller, the propleura almost impunctate. 
Length 13-3,4,, breadth 13-27) millim. (¢ @.) 
Hab. Mexico, Vera Cruz (Sailé); Guaremaua, San Juan and San Geronimo in Vera 
Paz (Champion) ; Panama, Volcan de Chiriqui (Champton). 
Four specimens, eight of which belong to the small, smoother form from Chiriqut. 
This species may be known from its Central-American allies by the gibbous 
prothorax, uneven elytra, which (owing to the depressed suture and the transverse 
depression at the middle of the disc) appear to be swollen below the base, and 
castaneous or ferruginous colour. | | 
22. Diastethus humeronotatus, sp. n. (Tab. XIII. figg. 18, 18a, 2.) 
Rhomboidal, short, convex, shining, black, the prothorax sometimes rufo-piceous, the elytra each with a very 
large rufo-testaceous humeral patch; glabrous above and beneath. Rostrum very long, rather slender, 
thickened, punctate, and abruptly bowed at the base in the 9, a little stouter and shorter in the ¢. 
Antennal club long and stout, acuminate-ovate. Prothorax convex, almost gibbous at the middle of the 
disc, arcuately narrowing from the base, strongly constricted in front; smooth, the base obliquely 
foveate on each side of the median lobe. Scutellum transverse. Elytra broad, transversely cordate, 
depressed below the basal margin and along the suture, the humeri broadly rounded, prominent; the 
sutural and marginal striz deep, the others faint or obsolete, bearing scattered oblong punctures, the 
interstices smooth and flat. Beneath coarsely punctate along the sides, the ventral segments very 
sparsely, finely punctate; prosternum with a broad flattened space down the middle, which is hollowed 
between the somewhat widely-separated anterior coxe. Anterior femora unarmed, the others sharply 
dentate. Tarsal joints 2 and 3 broad. 
Length 3-31, breadth 2;,-22 millim. (¢ 2?) 
Hab. Panama, David and Caldera in Chiriqui (Champion). 
Five specimens, all from the savana-region bordering the Pacific. 
A species with broad, transversely cordate, obsoletely striate, elytra, each of which 
has a large rufo-testaceous humeral patch. Smaller than the S.-American Centrinus 
scapularis, Boh. (the type of which I have seen), the posterior lobe of the prothorax 
much more convex, the rostrum more curved at the base, the intermediate and 
posterior femora dentate, Kc. | 
23. Diastethus rufipennis, sp. n. (Tab. XIII. figg, 19, 19a, 3.) 
Rhomboidal, shining, black, the elytra rufous, in one specimen with the scutellar region and a large apical 
patch, connected along the suture, black; glabrous above. Rostrum long, arcuate, thickened and 
abruptly bent downward at the base, sparsely punctate, suleate at the sides to near the apex. Mandibles 
with a sharp tooth on the outer edge beneath. Antennal club ovate. Prothorax short and broad 
transversely convex, rounded at the sides, strongly constricted in front, the base almost unimpressed: 
smooth. Scutellum transverse. Elytra triangular, depressed along the suture anteriorly ; deeply striate 
throughout, the strize feebly punctate, the interstices smooth and flat. Beneath closely punctate, the 
