456 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lo* 



Psammodius aenictus, new species 



Holotype elongate-parallel, convex, moderately shining, rufo- 

 piceous. Antennae rufotestaceous. Head moderately convex, closely 

 verrucose, with a band of close, fine to moderate punctures above 

 between the eyes, occiput smooth. Clypeus broadly, shallowly 

 emarginate with a small triangular tooth each side of the emargina- 

 tion, sides very weakly arcuate, finely reflexed; genae nearly right 

 angled, not fimbriate. Pronotum convex, sides hidden from directly 

 above, width 1.4 mm., length 1.0 mm., anterior angles rounded, 

 posterior angles broadly rounded, sides and base finely m.argined, not 

 noticeably fimbriate but the posterior angles and base actually very 

 finely crenate with extremely short, stubby setae, the setae half 

 as long as the distance between them; surface with close, evenly 

 spaced, moderate punctures separated by one to two diameters, the 

 punctures becoming gradually much finer from basal half of disc to 

 anterior and lateral edges, similarly, but more abruptly to base. 

 Elytra elongate, subparallel, not fimbriate, width 1.4 mm., length 

 2.2 mm., base margined, humeri dentate, striae deep, crenately punc- 

 tured, intervals smooth, shining, weakly convex, smooth area at 

 shoulders with a few moderate punctures. Metasternum shining, 

 smooth with a few scattered fine punctures at middle, midline long 

 and deep, terminating abruptly, sides scabrous. Abdominal seg- 

 ments shining, with evenly spaced moderate punctures separated by 

 one to two or three diameters, punctures somewhat finer at middle 

 than at sides, very finely margined posteriorly, fineh^ crenate in front, 

 the terminal segment more widely so at middle. Pygidium very 

 finely, closely punctate. Anterior femurs smooth, shining, mar- 

 gined anteriorly and posteriorly, a few more or less indistinct punc- 

 tures posteriorly. Middle and posterior femurs smooth, shining, a 

 trace of marginal line at knee, without setae; the posterior femurs not 

 noticeably wider than the middle femurs. Posterior tibia two-fifths 

 as wide at apex as total length; spurs slender, the longer equal in 

 length to first tarsal joint plus half the second, entire tarsus one-tenth 

 shorter than tibia. Length 3.6 mm., width 1.4 mm. 



Type: In collection of A. Martinez, Buenos Aires, Argentina. 



Type locality: "S. F. del Chipiriri," Province of Chapare, State 

 of Cochabamba, Bolivia, 400 m., November 1953, A. Martinez. 



Specimens examined: Holotype and two paratypes collected at 

 same time and place as type. Paratypes are in collections of A. 

 Martinez and U. S. National Museum. 



Remarks: The two paratypes are smaller than the holotype, being 

 3.0 and 3.2 mm. in length by 1.1 and 1.2 mm. in width. Except for 

 its strongly tuberculate head, this species is another of those that 

 seem to have practically all the characters of an Ataenius. 



