PTILODACTYLA. 637 



the under surface more coarsely, punctate. Head broad, the eyes large ; antennae as long as the body, 

 stout, the joints 4-10 each with a moderately long and stout ramus, 3 a good deal stouter than 4. 

 Prothorax short, transversely convex in front, sharply margined at the sides, the latter rounded and 

 converging from a little before the base, parallel behind ; the base trisinuate, denticulate ; the hind 

 angles acute and directed backwards. Scutellum with a very deep notch in the centre in front and also 

 deeply sulcate anteriorly. Elytra rather short, feebly rounded at the sides, with a deeply impressed 

 sutural stria at the base only, the apices conjointly rounded. Fifth ventral segment arcuate-emarginate 

 at the apex. 



"Far. The head in front and the prothorax rufous. (Fig. 21.) 



Length 4-4J, breadth 2-2| millim. 



Hab. Mexico, Orizaba and Toxpam (Salle). 



Four examples, including one of the variety, all males. This insect approaches 

 P. nigricornis ; but it is differently coloured, the scutellum is still more deeply 

 sulcate anteriorly (instead of having a sharply denned, narrow, median sulcus, as in 

 P. nigricornis and its allies), the thorax is more parallel behind, the sutural stria of 

 the elytra is very short, &c. It is much larger than P. ebenina. 



16. Ptilodactyla marginata. 



Oval, somewhat flattened above, shining, thickly and finely pubescent ; varying in colour from pitchy-black or 

 piceous with the sides of the prothorax and the suture and sides of the elytra obscure ferruginous to 

 entirely rufo-testaceous, the elytra usually with a paler humeral patch, the antennas fuscous or obscure 

 testaceous, the legs testaceous. Head rugulosely punctured, the eyes large ; antennas long and slender, 

 the joints 4-10 each with a ramus in the male and serrate in the female. Prothorax short and broad, 

 transversely convex in front, sharply margined at the sides, the latter rounded and converging from about 

 the middle forwards ; the base trisinuate, obsoletely denticulate, and with a short projecting tooth in the 

 centre; the surface very finely, somewhat thickly punctate. Scutellum sparsely punctured, deeply 

 notched in the centre in front. Elytra rather short, widest at about one-fourth from the base and there 

 very much wider than the prothorax, the sides rounded and broadly and acutely margined, the apices 

 somewhat produced ; thickly, very finely punctate, in one specimen obsoletely seriate-punctate on the disc, 

 and with a row of coarse punctures within the margin, and usually a row of fine punctures along the 

 suture. Fifth ventral segment rather deeply emarginate at the apex in the male. 



Length 3£-4|, breadth 2-2| millim. ( <J 2 .) 



Hab. Mexico, Teapa in Tabasco (H. H. Smith), Tapachula in Chiapas {Edge)-, 



Guatemala, Zapote (Champion). 



Found in some numbers at Teapa, single elsewhere. This small species may be 

 chiefly known by its broadly and acutely margined, confusedly punctured elytra, and 

 very finely punctured thorax. It is more oval in shape and more depressed than 

 P. convexicollis, from which it also differs in the non-canaliculate scutellum, the colour 

 of the antennae, &c. 



17. Ptilodactyla chiriquensis. 



EUiptic, moderately convex, flattened above, shining, thickly clothed with rather long pallid pubescence; 

 piceous or fusco-ferruginous, the base of the prothorax, the scutellum, and suture reddish in dark 

 specimens, the antenna fusco-testaceous, the legs testaceous. Head rugulosely punctured, the eyes 

 moderately large ; antennaB long and slender, the joints 4-10 each with a moderately long ramus in the 

 male and feebly serrate in the female. Prothorax short, convex in front, sharply margined at the sides, 

 the sides gradually converging from the base and rounded anteriorly, the hind angles acute ; the base 



