SCARAB BEETLE GENUS PSAMMODIUS — CARTWRIGHT 449 



November, December, Koebele; 6, Redondo, April; 2, Port Watson- 

 ville, Sept. 26, 1932; 4, Los Angeles County, Albright; 1, Newport, 

 June 14, 1915, Muchmore (under kelp). Paratypes will be placed in 

 all museum and private collections lending material for this study (see 

 acknowledgements, p. 414). 



Remarks: Two specimens of this species were not included in the 

 typical series or listed in the distribution because of very doubtful 

 label data. In one case, a specimen in the Chicago Natural History 

 Museum was labeled "Ariz. 1879. Andreas Bolter Collection." In the 

 other case, two specimens in the same small collection had evidently 

 been remounted and the labels exchanged, placing oregonensis in 

 Southern California and mcclayi in Oregon. 



Psammodius mcclayi is one of the few species in which the sexes may 

 be determined without dissection. The female is very similar to the 

 male except that the pygidium is widely smooth apically, slightly 

 narrower, and less widely rounded apically. P. mcclayi may be 

 separated from the closely allied P. caelatus by the lack of the anterior 

 postcoxal line on the metasternum, the complete transverse ridge or 

 carina of the posterior tibia, and the lack of a basal margin of the 

 elytra. 



The species is named for Prof. A. T. McClay of the University of 

 California at Davis, Calif. His fine, long series of specimens was 

 collected around the roots of grasses on the sand dunes of the seacoast. 



Psammodius martinezi, new species 



Holotype strongly convex, oval, shining, piceous. Antennae rufotes- 

 taceous. Head convex, closely moderately verrucose, occiput moder- 

 ately coarsely punctate above the eyes. Clypeus narrowly, deeply, 

 triangularly emarginate, the limiting angles each side obtusely 

 rounded, sides weakly arcuate, feebly reflexed; genae small, obtusely 

 rounded, set off by a distinct sutural notch, two or three moderately 

 long, fine, curving hairs from underneath. Pronotum convex, width 

 1.75 mm., length 1.1 mm., anterior angles obtusely rounded, posterior 

 angles broadly rounded, sides and base entire, not fimbriate, distinctly, 

 finely margined, the anterior edge more widely so, base very feebly, 

 broadly sinuate each side, angulate at middle; surface closely, moder- 

 ately punctate throughout, the punctures separated by approximately 

 their own diameters, gradually less deep and somewhat finer at the 

 extreme sides; median line broadly, vaguely impressed. Elytra 

 convex, as wide at base as pronotum, width 2.1 mm., length 2.6 mm., 

 base only vaguely margined, humeri not dentate, sides arcuate, not 

 fimbriate; striae moderately deep and wide, strial punctures very 

 moderate, deep; intervals feebly, evenly convex, smooth and shining 

 with fine inconspicuous punctures in a very irregular row, sides only 

 very feebly crenate. Metasternum smooth and shining at middle, 



