Coleopterological Notices, IV. 409 



non-strigose scales, with a series of recurved, subrecumbent setae on each strial 

 interval. Beak constricted at base, the head nearly spherical, eyes as in 

 Smicronyx. Prothorax constricted at apex, the ocular lobes more or less dis- 

 tinct. Scutellnm very small. Prosternum deeply sinuate at apex. Metaster- 

 num as long as the first ventral segment. Abdomen flat, sutures two to four 

 equally and feebly recurved at the sides, the second segment barely as long 

 as the next two and not quite as long as the fifth. Legs, excepting tarsal 

 structure, nearly as in Smicronyx. 



In this genus, which constitutes one of the intermediate forms 

 connecting Smicronyx with the Hydronomi, the claws are long and 

 generally widely divergent, but in one species become subparallel ; 

 they may be described as connate very near the base, with the 

 suture distinct. Promecotarsus is clearly, therefore, a transitional 

 form but must be classed with Smicronyx, these two genera consti- 

 tuting the group Smicronychi. 



The species may be easily known as follows : — 



Ungues widely divergent ; prothorax very nearly as long as wide ; ocular 

 lobes not prominent. 

 Prothorax abruptly, deeply constricted near the apex, the latter but slightly 



narrower than the base 1 lliaritiltlUS 



Prothorax gradually more strongly narrowed and broadly, feebly constricted 

 toward apex, the latter scarcely more than two-thirds as wide as the base. 



2 densus 



Ungues subparallel ; prothorax much wider than long, with the ocular lobes 



prominent 3 fumatus 



1 P. maritiltlllS n. sp. — Subcylindrical, convex, piceous, the legs feebly 

 rufescent with the tarsi black ; vestiture very dense, pale, the broad recurved 

 squamules very short and subrecumbent. Head shining, glabrous, the trans- 

 verse groove deep ; beak in the male moderately thick, densely, rugosely 

 punctate, sparsely squamulose, abruptly, strongly bent at the antennae, thence 

 more shining and feebly tapering to the apex, fully as long as the head and 

 prothorax ; antennae inserted at apical third, the funicle long, the basal joint 

 as long as the next two, second almost as long as the third and fourth, outer 

 joints a little longer than wide, not noticeably thicker, club very slender, fusi- 

 form, the basal joint almost glabrous. Prothorax nearly one-fourth wider than 

 long, parallel and broadly, evenly, rather strongly arcuate at the sides, deeply 

 constricted behind the apex, the latter transversely truncate and but slightly 

 narrower than the base ; disk feebly convex, very densely, not coarsely, sub- 

 rugosely punctate. Elytra at base but slightly wider than the prothorax, 

 rather more than twice as long, fully two-fifths longer than wide, the sides 

 subparallel and nearly straight in basal three-fifths, the apex narrowly para- 

 bolic ; striae deeply impressed. Legs moderate, the tarsi as long as the tibiae. 

 Length 2.0-2.2 mm. ; width 0.8-0.95 mm. 



