SCARAB BEETLE GENUS PSAMMODIUS CARTWRIGHT 439 



at base, width 1.20 mm., length 1.55 mm., base feebly, not distinctly 

 margined, humeri finely dentate, sides arcuate, not fimbriate; striae 

 wide, deep, punctures moderate and deep; intervals evenly convex, 

 both sides strongly and quite deeply crenate. Metasternum shining, 

 smooth, with scattered minute punctures, midline distinct and 

 moderately deep over posterior two-thirds, the extreme end still 

 deeper, forward third shallow and less well defined, anterior post- 

 coxal line fine but distinct, extending to eroded side line near posterior 

 angle, posterior arcuate antecoxal line strong, deep, and extending 

 outward to extreme edge. Abdominal segments smooth and shining, 

 anterior margin minutely crenate, posterior edge finely margined, 

 laterally with two or three fine setigerous punctures bearing very fine, 

 inconspicuous hairs, terminal segment more widely crenate in front. 

 Pygidium scabrous basally, fringed apically with moderately long, 

 very fine setae. Anterior femur finely margined anteriorly, posterior 

 face smooth. Middle and posterior femurs with fine posterior mar- 

 ginal line visible from behind, smooth and shining otherwise with one 

 or two close setigerous punctures along posterior edge near apical 

 third. Posterior femur nearly one-third wider than middle femur. 

 Posterior tibia about twice as long as wide at apex. Spurs narrow, 

 not much longer than first tarsal joint, the latter elongate-triangular 

 and as long as following two joints together. Length 2.5 mm., width 

 1.2 mm. 



Type: In British Museum (Natural History). 



Type locality: Santarem, Para, Brazil. 



Specimens examined: Holotype and two paratypes from San- 

 tarem and Alio de Chia (100 miles from Santarem on the Tapaj6s 

 River), all collected by H. W. Bates. 



Remarks: This species is very close to P. holivianus but the coarse 

 punctures of the pronotum are more numerous, the elytral striae are 

 much coarser and the intervals more noticeably crenate, the midline 

 of the metasternum is distinct, and the anterior and posterior lines 

 of the metasternum are deep and extended. 



Psammodius indefensus (Schmidt) 



Psammobius indefensus Schmidt, Soc. Ent., vol. 24, p. 60, 1909. 



Oblong oval, slightly broader behind, moderately shining, piceous, 

 legs and margins of head and pronotum dark castaneous. Antennae 

 pale rufotestaceous. Head convex, moderately coarsely verrucose; 

 occiput with a group of close, coarse punctures each side behind a 

 short, diagonal, closely punctate groove and intervening smooth, 

 weakly convex ridge. Clypeus broadly, triangularly emarginate, the 

 limiting angles each side obtusely rounded, sides nearly straight to 

 slight notch at clypeal suture, genae small, fimbriate. Pronotum 

 shghtly narrower in front, width 1.25 mm., length 0.85 mm., anterior 



