SCARAB BEETLE GENUS PSAMMODIUS CARl^WRIGHT 437 



nal segments shining, very minutely alutaceous, laterally with a few 

 fine setigerous punctures bearing very fine, moderately long hairs in a 

 short transverse row, minutely crenate anteriorly and veiy finely 

 margined posteriorly toward sides, terminal segment more widely 

 crenate in front. Pygidium with a scabrous area each side basally, 

 terminally smooth, fringed with very fine setae. Anterior femur finely 

 margined in front, posterior face smooth. Middle and hind femurs 

 with fine posterior marginal line visible from behind, smooth, shining, 

 each with two setigerous punctures close together slightly beyond the 

 middle near the posterior margin. Posterior femur nearly one-third 

 wider than the middle femur. Posterior tibia about twice as long as 

 wide at apex. Spurs narrow, long spur shorter than first two tarsal 

 joints together. First tarsal joint elongate-triangular, as long as 

 following two joints together. Length 2.8 mm., width 1.3 mm. 



Type: USNM 61846. 



Type locality: Tiguipa, Bolivia. 



Specimens examined: 6; holotype and 5 paratypes as follows: 

 Bolivia: 2 (holotype and paratype), Tiguipa, April 1922, Harrington; 

 1, Lagunillas to Rio Grande, September 1-10, 1920, Harrington; 

 Argentina: Tucumdn: 2, Puente Rio Sali, Tucumdn, November 

 1950, Martinez; Paraguay: Boqueron: 1, "Guam. Oruro," Novem- 

 ber 1950, Martinez. Paratypes in collections of A. Martinez and 

 U. S. National Museum. 



Remarks. — The specimens show only slight variation. The smallest 

 paratype is only 2.5 mm. in length. One has a slightly longer, more 

 widely scabrous pygidium, likely a male sexual modification. 



Psammodius manaosif new species 



Holotype oblong oval, convex, moderately shining, ferrugineus. 

 Antennae testaceous. Head convex, closely, moderately verrucose; 

 occiput minutely alutaceous with scattered, shallow, coarse punc- 

 tures. Clypeus moderately emarginate, the emargination rounded 

 out rather than angulate, limiting angles rounded, margin finely 

 reflexed, sides weakly arcuate; genae fimbriate, small, rounded, set 

 off by a shght sinuation of the margin. Pronotum very slightly 

 narrower in front, width 0.9 mm., length 0.6 mm., anterior angles 

 rounded, posterior angles obtusely rounded, sides and base entire, 

 not crenate, not fimbriate, distinctly margined; surface with close, 

 deep, coarse punctures arranged in three transverse furrows, the first 

 somewhat expanded over the disc anteriorly, the third with fewer 

 punctures more widely spaced in a single irregular row, the second and 

 third interrupted by the similarly punctate, median longitudinal 

 furrow ; surface otherwise smooth. Elytra as wide at base as pronotum, 

 width 1.1 mm., length 1.6 mm., base margined, humeri finely dentate, 

 sides arcuate, not fimbriate ; striae moderately deep, intervals smoothly 



327016—55 4 



