648 SEERICOENIA. 



broad, deep, median channel. Elytra moderately long, at the middle much wider than the prothorax, a 

 little narrowed at the base and there forming almost a continuous outline with it, narrowly margined at 

 the sides ; obsoletely seriate-punctate to near the apex, the interstices flat and thickly punctured. Fifth 

 ventral segment narrowly and deeply marginate at the apex in the male. Tarsal claws dilated to beyond 

 the middle and with an acute curved tooth in the male, and rectangularly dilated in the female. 

 Length 7-7 J, breadth 3^-31 millim. ( c? $ .) 



Hab. Mexico, Juquila in Oaxaca {Salle). 



One male and three females. Very like P. convexa and P. conjinis, near which it 

 would be better placed ; but differing from them in having the scutellum still more 

 deeply sulcate, and the dilated portion of the claws longer, and terminating in a curved 

 tooth, in the male. 



39. Ptilodactyla pruinosa. 



Moderately elongate, narrow ( <$ ), broader ( $ ), somewhat flattened above, shining, thickly clothed with short 

 greyish pubescence ; reddish-brown above, obscure ferruginous beneath, the antennae piceous or brown, 

 with the two basal joints reddish, the legs testaceous. Head rugulosely punctured, the eyes large ; antennae 

 very elongate, slender, the joints 4-10 each with a moderately long ramus in the male and serrate in the 

 female. Prothorax very short, transversely convex in front, sharply margined at the sides, the latter 

 rounded and converging almost from the base, the hind angles sharp ; the base trisinuate, strongly 

 denticulate, and with a projecting tooth in the centre ; the surface thickly, finely punctate. Scutellum 

 thickly punctured, deeply notched in the centre in front, and narrowly sulcate thence to near the apex. 

 Elytra rather elongate, not or very little wider than the prothorax, sharply margined at the sides, sub- 

 parallel in their basal half and produced at the apex, the humeri obtusely rectangular ; thickly, finely 

 punctate, usually with indications of faint stria?, the sutural one more deeply impressed. Fifth ventral 

 segment broadly and shallow! y emarginate at the apex in the male. Tarsal claws with an acute tooth in 

 the male and rectangularly dilated in the female. 



Length 5-5 i, breadth 2-2 § millim. ( c? $ .) 



Hah. Mexico, Toxpam, near Cordova (Salle). 



Two males and two females. In this small, rather elongate species the humeri are 

 more angular than in most of the allied forms, and the antenna? are much darker in 

 colour than the legs. It closely resembles P. convexicollis, but is much more elongate, 

 and has more angular humeri (in this respect agreeing with P. gibbicollis), differently 

 coloured antennae, more sharply toothed claws in the male, &c. P. pruinosa is very 

 like P. heterophya, Kirsch, from Peru, but it has a smoother thorax, with the base more 

 strongly denticulate, the antennae darker, the elytra longer, &c. 



40. Ptilodactyla Caudata. (Tab. XXVII. figg. 22, <$ ; 22 a, maxilla and 

 maxillary palpus ; 22 b, fifth ventral segment ; 22 c, ditto, in profile ; 22 d, genitalia.) 



c?. Moderately elongate, convex, shining; sparsely clothed with short, fine, greyish pubescence; nigro- 

 piceous, the antenna? testaceous, becoming darker towards the base, the two basal joints sometimes 

 reddish, the legs piceous or brownish, with the tarsi testaceous at the tip. Head thickly punctured, the 

 eyes very large and prominent ; antenna? very elongate, slender, joints 4-10 each with a long ramus, all 

 the rami longer than the joints themselves. Prothorax short, transversely convex in front, sharply 

 margined at the sides, the latter rounded and rapidly converging from a little before the base to the apex, 

 the hind angles acute ; the base trisinuate, denticulate, and with a projecting tooth in the centre ; the 

 surface very finely, rather sparsely punctate, the punctures placed upon distinct granules towards the sides 



