SCARAB BEETLE GENUS PSAMMODIUS — CARTWRIGHT 427 



and base crenate, fimbriate with obtuse, moderate setae, base finely 

 indistinctly margined; surface rough, uneven, and very finely punctate 

 throughout, with four transverse furrows and ridges more or less 

 distinct, the fifth ridge and basal area completely broken up into 

 flattened tubercles, punctures of the furrows moderate to coarse, con- 

 fused, frequently leaving intervening fine tubercles; median line 

 distinct over basal half or three-fourths, punctures fine and confused; 

 laterally the coarse punctures over the convexity beyond the fovea 

 become arcuate, elongate, rather close, and frequently run together. 

 Elytra as wide as pronotum at base, width 1.65 mm., length 2.1 

 mm., base margined, humeri dentate, sides weakly arcuate, not fimbri- 

 ate; striae deep, strial punctures fine, deep; intervals convex, finely 

 alutaceous but shining, weakly tectiform and vaguely tuberculate, 

 strongly crenate along inner margin by a row of punctures independent 

 of the strial punctures, outer margin weakly crenate. Metasternum 

 smooth and shining at middle, median line sharp and distinct, deeper 

 at each end, the anterior end extending well forward between the 

 coxae, anterior postcoxal line strong and extending out to the scabrous 

 area at extreme side, posterior line in front of posterior coxal plate 

 deep and distinct. Abdominal segments shining but minutely aluta- 

 ceous, finely crenate in front, the terminal segment much more widely 

 so, very finely margined behind, each with a median, transverse, some- 

 what eroded line and row of moderate to coarse, setigerous punctures, 

 the moderately long, fine, pointed hair appearing behind a very small 

 tubercle or granule. Pygidium alutaceous, fringed apically with 

 moderately long, fine, pointed hairs. Anterior femur with strong, 

 deep, anterior marginal line. Middle and posterior femurs smooth, 

 shining, with deep posterior marginal line extending two-thirds to 

 three-fourths the distance to trochanter, four or five moderate seti- 

 gerous punctures in a curving row from middle to knee, a more com- 

 plete row of similar setigerous punctures bordering the anterior 

 margin. Posterior femur one-fifth wider than middle femur. Pos- 

 terior tibia three times as long as wide at apex, spurs narrow, long spur 

 equal to length of first two tarsal joints combined. First tarsal joint 

 elongate-triangular, slightly longer than the two following joints to- 

 gether. Length 3 to 3.6 mm., width 1.5 to 1.65 mm. 



Type: In Fall collection, Museum of Comparative Zoology, Cam- 

 bridge, Mass. 



Type locality: San Jose del Cabo, in the Cape Region of Baja 

 California. 



Specimens examined: 16. 



Distribution: United States: Wyoming: Fort Laramie. Colo- 

 rado: Monon (?). Nebraska: West Point. Kansas: Topeka. Ari- 

 zona: Chiracahua Mountains. Mexico: Baja California: San Jos6 

 del Cabo. Coahuila: Saltillo. Tamaulipas: Nuevo Laredo. Colima: 

 Colima. 



