SCARAB BEETLE GENUS PSAMMODIUS — CARTWRIGHT 459 



Specimens examined: Holotype and 27 paratypea collected at 

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

 Martinez and U. S. National Museum. 



Remarks: Except for the lack of transverse pronotal grooves and 

 a narrowly notched clypeus, Psammodius fimbriatus exhibits all char- 

 acters of more typical Psammodius, including maxillary teeth. It is 

 one of the species bridging the slight gap between the more typical 

 Psammodius and those having characters of Ataenius. 



Psammodius mapirit, new species 



Holotype oblong oval, moderately shining, rufopiceous. Antennae 

 testaceous. Head moderately convex, coarsely verrucose, occiput 

 smooth. Clypeus sharply dentate each side of a broad, shallow 

 emargination, sides slightly arcuate to the rounded genae. Pronotal 

 width 1.4 mm., length 0.85 mm., anterior angles broadly rounded, 

 posterior angles very obtusely rounded, marginal line deep and dis- 

 tinct, sides and base fimbriate with fine, sharp hau's, wealdy crenate; 

 surface evenly convex, without furrows except for a short, shallow 

 depression inward from each anterior angle, lateral foveae small but 

 evident, coarse punctures very moderate in size, separated by one to 

 three or four diameters, irregularly but generally distributed except 

 at extreme sides, scarcely perceptible, scattered, minute punctures 

 intermixed. Elytra margined at base, humeri weakly dentate, sides 

 very slightly arcuate, fimbriate with short, fine hairs, width 1 .60 mm., 

 length 2.15 mm., striae moderately fine and deep, strial punctures fine; 

 intervals smooth, weakly convex, their sides very slightly irregular 

 and very weakly crenate. Metasternum smooth at middle, scabricu- 

 late at sides, median line deep, relatively short, abruptly terminated 

 at each end, anterior postcoxal line absent. Abdominal segments 

 smooth, finely crenate along anterior margin, crenations slightly 

 wider at middle of terminal segment, each segment with a medianly 

 interrupted, transverse row of setigerous punctures bearing moder- 

 ately long, fine hairs. Pygidium finely scabriculate basally at sides. 

 Anterior femur without anterior marginal line. Middle and posterior 

 femurs smooth, without posterior marginal line but with a long line of 

 close, setigerous punctures paralleling the posterior margin over 

 outer two-thirds and curving forward in front of the knee to and along 

 the anterior margin. Posterior femur one-third wider than the 

 middle femur. Posterior tibia twice as long as wide at apex, spurs 

 moderately narrow and foliaceous, the long spur very slightly longer 

 than the first tarsal joint. First joint of posterior tarsus elongate- 

 triangular, as long as following three together. Length 3.4 mm., 

 width 1.6 mm. 



Type: USNM 61849. 



Type locality: Near mouth of Rio Mapiri, Rio Beni, La Paz, 

 Bolivia. 



