460 PROCEEDINGS OF THE NATIONAL MUSEUM vol. io4 



Specimens examined: Holotype, collected in September by W. M. 

 Mann, Mulford Biological Exploration, 1921-1922. Paratypes: 1, 

 same data as holotype, U. S. National Museum; 1, Buenavista, 

 Provincia de Ichilo, Santa Cruz, Bolivia, October 1949, A. Martinez, 

 in Martinez collection. 



Remarks: Psammodius mapirii may be separated from the other 

 South American species having distinctly fimbriate margins of the 

 elytra by characters given in the key to species. It is closely similar 

 to fimbriatus . 



Psamntodins armaticeps (Fall) 



Psammobius armaticeps Fall, Journ. New York Ent. Soc, vol. 40, p. 190, 1932, 



Oblong, shining, dark castaneous. Antennae pale rufotestaceous. 

 Head moderately convex, closely, not very coarsely verrucose, occiput 

 smooth. Clypeus with an acute, triangular tooth each side of the 

 wide, shallow median emargination, sides slightly arcuate, genae 

 rounded, fimbriate. Pronotum convex, width 1.45 mm., length 

 0.90 mm., anterior angles obtuse, posterior angles very broadly 

 rounded, base margined, sinuate and slightly lobed at middle, sides 

 and base crenate and fimbriate with moderately long, simple hairs, 

 shorter across base; surface smooth, shining, minutely punctate 

 laterally beyond foveae, disc with many, irregularly placed punctures, 

 very coarse at middle to less coarse outward in all directions, no 

 middle line, furrows, or other depressions except the usual short 

 depression inward from the anterior angles. Elytra margined at 

 base, humeri weakly dentate, sides fimbriate with moderately long 

 hair, width 1.75 mm., length 2.3 mm.; striae crenate punctate, the 

 punctm-es moderate and deep; all intervals convex, ninth and tenth 

 not different. Metasternum smooth, shining, median line half total 

 length, deep, abruptly terminated at each end, minutely alutaceous 

 at sides, anterior postcoxal line absent, depressed in front of posterior 

 coxal plate but without a definite line. Abdominal segments smooth 

 and shining at middle, a transverse row of three or four coarse, 

 shallow, setigerous punctures at each side, usually a very small 

 tubercle in front of each hair, segments finely crenate in front, the 

 crenations wider at middle of terminal segment. Pygidium shining, 

 smooth at apex, scabrous basally, a few scattered setigerous punctures. 

 Anterior femur without anterior groove, posterior face smooth, 

 shining. Posterior femur one-third wider than middle femur, smooth, 

 shining, without posterior marginal line, a row of close, coarse, seti- 

 gerous punctures parallel to but some distance from the posterior 

 edge. Middle and posterior tibiae without transverse ridges but 

 with longitudinal rows of tubercles. Outer edge of posterior tibia 

 twice as long as apical width, spurs sharp, narrowly foliaceous, the 

 longer subequal to the combined length of first two tarsal joints. 



