SCARAB BEETLE GENUS PSAMMODIUS — CARTWRIGHT 433 



wide, deep median line over basal half and four more or less evident 

 transverse grooves, the first, postapical, deep, entire, from one anterior 

 angle to the other immediately behind the distinctly tuberculate 

 anterior margin, the others interrupted by the midhne, the third 

 deeper and more conspicuous than the second and fourth. Elytra 

 convex, width 1.5 mm., length 1.95 mm., about as wide at base as 

 pronotum, humeri rounded, base not margined, sides arcuate, not 

 fimbriate; striae deep, punctures fine and deep; intervals moderately 

 convex, sides crenate, each with a row of very fine punctures between 

 middle and outside edge. Metasternum depressed at middle, smooth, 

 shining, midline scarcely impressed, its length less than the width of 

 the posterior femur, without anterior postcoxal line and only vaguely 

 concave in front of the posterior coxal plate, finely alutaceous at ex- 

 treme sides. Abdominal segments only moderately shining, the third, 

 fourth, and fifth apparently connate at middle, very minutely aluta- 

 ceous under high magnification, and with scattered very fine punc- 

 tures, each segment except the last with a medianly interrupted 

 transverse row of fine, setigerous punctures, the hairs moderately long 

 and fine, the terminal segment and apical margin of the pygidium 

 with complete rows of similar, more closely spaced, long fine hairs. 

 Anterior femur more robust, thicker through than usual, without 

 anterior marginal groove, posterior face smooth and shining in front, 

 finely alutaceous posteriorly. Middle and hind femurs wihout pos- 

 terior marginal line, convex, smooth and shining except for a curving 

 row of three or foiu* widely spaced setae over apical half in front of 

 knee, middle femur about three-fourths as wide as posterior femur. 

 Posterior tibia apically slightly less than half as wide as long, spurs 

 slender, the long spur reaching middle of second tarsal joint. First 

 tarsal joint elongate-triangular, equal in length to following two com- 

 bined. Length 3 mm., width 1.5 mm. 



Type: In Museum of Comparative Zoology, Cambridge, Mass. 



Type locality: El Paso, Texas. 



Specimens examined: 3, including holotype. 



Distribution: United States: Texas: El Paso. Arizona: Globe. 

 Mexico: Chihuahua: Ciudad Juarez. 



Season: November. 



Remarks: In general appearance this species is superficially very 

 much hke quinqueplicatus Horn; however, the lack of distinct coarse 

 punctures on the pronotum, the very short metasternum, and other 

 differences are seen immediately on close examination. The scabrous 

 surface of the pronotum, even over the area bej^ond the lateral fovea, 

 shows relationship with interruptus Say and alHed forms. 



