436 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io4 



triangular, not as long as following three together. Length 3 to 3.7 

 nun., width 1.4 to 1.8 mm. 



Type: Academy of Natural Sciences of Philadelphia, No. 3620. 



Type locality: "Probably Arizona or Texas." 



Specimens examined: 510. 



Distribution. — United States: Arizona: Benson, Geronimo (Gila 

 River, Graham County), Globe, Holbrook, Nogales, Oak Creek, 

 Patagonia, Peach Springs, Phoenix, Robles Ranch (Pima County), 

 Sabino Canyon (Santa Catalina Mountains), Superior, Tucson, Win- 

 slow. New Mexico: Albuquerque, Pyramid Peak (Dona Ana County). 

 Texas: El Paso. Mexico: Mexico: Temascaltepec, Tejupilco. Nay- 

 arit: San Bias. Oaxaca: Salina Cruz. 



Season: July 6 to September 6. 



Remarks: Psammodius quinqueplicatus Horn has five well marked 

 transverse ridges on the pronotum, counting the anterior margin as the 

 first. A sixth is not so wide but is usually distinguishable behind the 

 fifth furrow. The coarse punctures of the furrows are sometimes so 

 close as to run together, the fifth furrow sometimes ill-defined. The 

 tarsi are relatively long in this species, the tibia and tarsus of the 

 middle legs being subequal in length, while the posterior tarsus is 

 three-fifths to four-fifths as long as the posterior tibia. 



Psammodius bolivianus, new species 



Holotype oblong oval, convex, moderately shining, ferruginous. 

 Antennae rufotestaceous. Head convex, closely, moderately verru- 

 cose; occiput smooth, a single, shallow, coarse puncture midway each 

 side, scattered minute punctures posteriorly. Clypeus moderately 

 deeply, triangularly emarginate with limiting angles rounded, edge 

 finely reflexed, sides weakly arcuate; genae small, fimbriate, somewhat 

 angulate. Pronotum slightly narrower in front, width 1.05 mm., 

 length 0.75 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 interrupted by the median longitudinal furrow over 

 basal three-fourths, the first much wider toward the midline, the 

 punctures of the third furrow fewer and more widely separated, sur- 

 face otherwise smooth. Elytra very slightly wider than pronotum at 

 base, width 1.3 mm., length 1.7 mm., base margined, humeri not dis- 

 tinctly dentate, sides arcuate, not fimbriate; striae deep, finely punc- 

 tate; intervals smoothly convex, margins slightly crenate. Metaster- 

 num smooth, shining, with scattered very fine punctures, depressed at 

 middle, midline feeble and very weakly impressed, only a trace of the 

 anterior postcoxal line at extreme side, surface triangularly depressed 

 in front of posterior coxal plate but without a distinct line. Abdomi- 



