AMERICAN COLEOPTERA. 291 



ginate and on each side distinctly subangiilate. Thorax slif^htly broader than 

 lonp, broadest at middle, sides short, viewed laterally slightly sinuate: hind 

 angles and base broadly rounded ; surface rather coarsely verrueose, and with 

 three transverse grooves, the posterior two interrupted at middle. Elytra ob- 

 long, sides moderately rounded, strife deep with coarse punctures, intervals 

 flat, finely biseriately granulate. Body beneath subopaqueand slightly rugose 

 Length .12 inch; 3 mm. 



The truDsverse grooves of the thorax although less distinct than in 

 srnher are more so than in callforuivus. The anterior groove is shallow 

 but entire, the second close to the first and visible only at middle, the 

 third is interrupted at middle and much the deepest and most distinct, 

 the fourth is very faint. The elytral intervals are very distinctly 

 biseriately tuberculate at basal half but the arrangement becomes 

 confused near the apex. The granules of tlie thorax are all dis- 

 tinct moderately distant from each other and proportionately larger 

 than in either of the preceding species. 



One specimen in my cabinet, from under chips at the margin of 

 San I'edio lliver, Arizona. 



PLEUROPHORTJS, Muls. 

 P. caesus, Panz. {S':arahcEun) l-'auu. Germ. ?,3, 2; Fab. (Aphodius) Syst. El. 1, 

 p. 82; Muls. {Pleurophorus) Col. Fr. Lamell. p. 312; Harold (P.sa»iffiO(ims) Catal. 

 p. 10(58. — Elongate, subparallel, feebly convex, black, shining. Head moder- 

 ately convex, nearly rounded or very feebly emarginate in front, surface shin- 

 ing covered with convex verrucse. Thorax slightly broader than long; sides 

 feebly rounded; surface with large punctures very widely and irregularly 

 scattered and with two transverse shallow grooves visible only at the sides, the 

 anterior being the deeper, and longitudinally broadly canaliculate at jmsterior 

 portion of median line. Elytra sub-erenulately striate, intervals moderately 

 convex smooth. Length .12 incli : mm. 



Several specimens collected in the Middle States are referred to 

 this species. They resemble in general appearance Atsexins (jntcilis, 

 but may readily be known by the verrueose head and the transverse 

 sulci of the thorax. The tarsal claws are moderate and the first 

 joint of liind tarsus longer than the longest spur. The genus seems as 

 worthy of adoption as distinct fnmi Pscanmoditts, as do O.vj/onms and 

 Dialijtcs from Ajjhodius. 



PSAMMODIUS, Gyll. 



Five species in our fauna distinguished as follows : 



Clypeus emarginate rounded or subangulate on each side. 

 Transverse ridges distinct. 



Four discal ridges ; color piceous aegialioides. 



Five discal ridges; color ferruginous quiuqueplicatus. 



Transverse ridges very indistinct obliterated at middle. 

 Three ridges; color piceous. 



