228 RHYNCHOPHORA. 
3. Prosternum armed with two short spines, which are sometimes wanting ; first ventral segment depressed 
down the middle ; anterior tibia hollowed and ciliate towards the apex within. 
Length 3-6, breadth 1,%-3? millim. (¢ 2.) 
Hab. Mexico (Sommer!; ex coll. Flohr; Truqui, in coll. Fry), Acapulco, Cordova, 
Jalapa, Oaxaca (Hoge), Toxpam (Sallé), Guerrero (Baron), Xucumanatlan, Omilteme, 
Chilpancingo (H. H. Smith), Temax in N. Yucatan (Gawmer); GuateMata, San 
Gerdnimo, Zapote, Duefias (Champion); Panama, Volcan de Chiriqni (Champion).— 
Braziu }, 
This is the commonest of the Central-American forms related to D. mexicanus. It 
is relatively narrower than that insect, and has the elytral stria deeply impressed and 
less distinctly punctate, and each of the femora armed with two distinct teeth. The 
single specimen from Duefias is only 3 mm. in length, and has the prothorax more 
distinctly punctate than in any of the others we have received. One of the “types,” 
communicated by Dr. Sjéstedt, is labelled “Texas (Dupont),” but there is perhaps 
some mistake about this locality, Boheman giving Mexico and Brazil only. 
8. Diastethus falcatus. 
Centrinus faleatus, Boh. in Schénh. Gen. Cure. viii. 1, p. 246°. 
Hab. Costa Rica, Reventazon, Plains of Santa Clara, 200 metres, Atlantic slope 
(Biolley).—Cotomsia (Mus. Brit.); Braziu'. 
The single ( ¢ ) specimen from Costa Rica (captured in Dec. 1904) referred to this 
species is very like D. aztecus, but has the prothorax more flattened on the disc, the 
elytra less depressed below the basal margin, and the tibie bowed at the base. The 
prosternal spines of the male are moderately long; the sutural and marginal striz of 
the elytra are deeply impressed, the others faint; the anterior femora are uni-, the 
others bidentate. From JD. corvinus it differs in having the suture of the elytra 
almost unimpressed, the rostrum stouter, the anterior femora unidentate, the tibie 
less acutely dilated externally. 
9. Diastethus corvinus, sp. n. 
Subrhomboidal, broad, shining, black, glabrous, the ventral depression of the ¢ with a few golden, hair-like 
scales. Head very sparsely punctate, transversely depressed in front ; rostrum strongly arcuate, long, 
comparatively slender, sparsely punctate, sulcate and strigose at the sides (the antenne missing). 
Prothorax strongly constricted in front, almost smooth, the short anterior lobe sparsely punctured, the 
base shallowly foveate on each side of the median lobe. Scutellum very short, arcuate, produced into a 
Jong, fine tooth in the middle behind, Elytra triangular, depressed along the suture and at the middle 
of the base, the humeri rounded; the sutural and outer stria deep, the others faint, all finely punctate, 
the interstices smooth. Beneath very sparsely punctate; prosternum armed with a conical prominence 
in front of each coxa, the sulcus broad and deep ; ventral segment 1 depressed in the middle. Femora 
each with two small teeth and several denticles. Tibie acutely, triangularly dilated on the outer edge 
near the apex, feebly curved at the base, the anterior pair narrow, strongly sinuate, and with the 
terminal spur widened towards the base. 
Length 53, breadth 32 millim. (¢.) 
