642 SEEEICORNIA. 



Two males. Very like P. lutescens and P. submaculata, but differing from these and 

 nearly all the other allied forms (P. humerosa and P. tenuis excepted) in the unusually 

 short third joint of the antennae, this joint being about one-third shorter than the fourth. 



26. Ptilodactyla humerosa. 



J . Elliptic, narrow, moderately convex, shining, thickly clothed with rather long pallid pubescence ; piceous, 

 the prothorax bordered on all sides with ferruginous, the elytra with a large humeral patch and the sides 

 broadly and indeterminately from a little beyond the middle to the apex, and also the outer margins, 

 testaceous, the suture and scutellum obscure ferruginous ; the antennae and legs testaceous, the eyes black. 

 Head rugulosely punctured, the eyes large and prominent ; antennae slender, moderately long, the joints 

 4-10 each with a ramus, the rami increasing in length outwards, the outer ones much longer than the 

 joints themselves, joint 3 much shorter than 4. Prothorax short, convex in front, sharply margined at 

 the sides and apex, the sides rounded and rapidly converging from about the basal third forwards, the 

 hind angles acute ; the base trisinuate, smooth, with a short projecting tooth in the centre ; the surface 

 thickly granulate-punctate. Scutellum rugulosely punctured, notched in the centre in front. Elytra 

 rather short, acutely margined and slightly rounded at the sides, of the same width as the prothorax 

 at the base, a little wider at the middle ; shallowly punctate-striate to near the apex, the interstices 

 thickly punctured. Eifth ventral segment feebly subtriangularly emarginate at the apex. 

 Length 2^, breadth 1| millim. 



Hab. Mexico, Teapa in Tabasco (H. II. Smith). 



One example. Agrees with P. antennalis in the short third antennal joint, but differs 

 from that species in its smaller size and less elongate shape, the smooth basal margin 

 of the thorax, and also in the coloration of the elytra. The insect has also been found 

 in plenty by Mr. Smith in the island of St. Vincent, and these specimens show very little 

 variation. From the Peruvian P. secedens, Kirsch, which it resembles in colour, the 

 present species may be known by the short third antennal joint and the granulate, 

 posteriorly dilated thorax. 



27. Ptilodactyla lutescens. 



Elliptic, narrow, flattened above, shining, thickly clothed with rather long pallid pubescence ; testaceous or 

 fusco-testaceous, the elytra usually with a more or less distinct oblique paler stripe extending downwards 

 from the shoulder to the suture, the antennae and legs testaceous. Head rugulosely punctured, the eyes 

 large and prominent in the male, smaller in the female ; antennas very long and slender, the joints 4-10 

 each with a long ramus in the male, joint 3 a little shorter than 4. Prothorax short, moderately convex in 

 front, sharply margined at the sides and apex, the sides rounded and rapidly converging from about the 

 basal third to the apex, the hind angles acute ; the base trisinuate, obsoletely denticulate at the sides ; 

 the surface thickly granulate-punctate. Scutellum rugulosely punctured, with a shallow notch in the 

 centre in front. Elytra rather short, sharply margined and a little rounded at the sides, slightly wider 

 than the prothorax ; coarsely punctate-striate, the interstices feebly convex and thickly punctured. Fifth 

 ventral segment shallowly arcuate-emarginate at the apex in the male. 



Length 3-3§, breadth 1|— 1| millim. 



Hab. Mexico, Teapa in Tabasco (SallS, Hoge, H. II. Smith) ; Guatemala, San Juan 

 in Vera Paz (Champion). 



Seven examples. Very like P. deleta, but considerably smaller and with much 

 shorter elytra. The fifth ventral segment is feebly emarginate at the apex in the male. 



