CETONIIN.^ 345 



enlarged and otherwise specially modified. The clypeus is very 

 different from that of Psilocnemis in having the external apical 

 surface strongly inflexed and not vertical. The mentum, also, is 

 narrower, concave, shallowly punctate, not at all sinuate but 

 evenly rounded at the sides and with the median part of the hind 

 margin acutely prolonged. The singular lateral carinae and trans- 

 verse basal fossa of the head are generic in significance beyond a 

 doubt. The legs are longer than in any other type of the tribe 

 known to me, native or foreign. I have at hand two distinct 

 species of this genus, definable as follows: 



Prothorax not more than a fourth wider than long. Body moderately 

 stout and shining, very depressed, deep black throughout, without 

 cretaceous spots; head fully half as wide as the prothorax, the lateral 

 carinae sharp, highest behind, not quite attaining the reflexed clypeal 

 apex, the obtusely elevated median part of the vertex gradually 

 narrowing anteriorly, becoming a fine carina apically, not very 

 coarsely but strongly, somewhat closely punctate, the lateral de- 

 pression along the carinae with very shallow foveae anteriorly, be- 

 coming subimpunctate posteriorly like the transverse basal groove; 

 clypeus with the apex strongly and rapidly reflexed, transversely 

 truncate from a dorsal viewpoint; basal antennal joint gradually 

 much attenuated basally; prothorax widest near apical third, the 

 sides evenly rounded, converging and straighter basally; base broadly, 

 evenly arcuate, the angles polished, subdetached by an oblique sulcus, 

 their outer outline continuous with the sides, the apical angles ob- 

 tusely nodular because of a coarse external fossa; surface rather 

 depressed, feebly impressed along the middle, deplanate toward the 

 sides, which are without vestige of beading, the punctures coarse, 

 well separated, becoming closer and deep laterally; the punctuation 

 crosses the depressed median line without change in character; 

 scutellum well developed, gradually finely attenuated apically and 

 having sparse shallow incised annuli; elytra slightly more than one- 

 half longer than wide, almost one-half wider than the pro- 

 thorax, parallel and rectilinear at the sides, rapidly rounding 

 and obtuse at apex, the lateral sinus long and shallow; surface 

 flat and with two feeble costse, the summit of the flanks abruptly 

 and strongly elevated, the punctures elongate incised annuli, 

 open behind and with the incised lines slightly burred at 

 the edges; on the flanks they become smaller, more rounded and 

 very deep, except beneath, where they are again very shallow; 

 pygidium convex, with scattered rounded annuli, strongly carinate 

 except at base and apex; under surface with large scattered incised 

 annuli, open behind; legs long, slender, the anterior tibiae slender, 

 slightly arcuate, obtusely bidentate apically, the anterior tarsi 

 equal in length to the tibiae, the fourth joint much swollen, trans- 

 verse, more rounded within, obliquely sinuato-truncate and ciliate 



