SCARAB BEETLE GENUS PSAMMODIUS — CARTWRIGHT 419 



21. Eyes well developed; elytral striae coarsely crenate; sides of pronotum entire; 



Florida malkini Cartwright 



Eyes vestigial; striae feebly impressed, not distinctly crenate; sides of pro- 

 notum crenate; North Carolina to Mississippi .... hydropicus Horn 



22. Elytral margins not fimbriate; anterior femur with a strong, complete anterior 



marginal groove; abdominal segments with a transverse row of setigerous 

 punctures; anterior postcoxal line of metasternum continued outward to 



sides; Oregon to California oregonensis, new species 



Elytral margins fimbriate with long fine hairs; anterior marginal line of an- 

 terior femur obsolete 23 



23. With strong anterior metasternal line not reaching sides but converging with 



posterior line; base of elytra strongly margined; ante apical ridge of pos- 

 terior tibia not quite complete, narrowly interrupted at inner margin; 



British Columbia to California caelatus (LeConte) 



Without metasternal lines; base of elytra usually not distinctly margined; 

 ante apical ridge of posterior tibia complete; California, 



mcclayi, new species 



24. Pronotum margined with perimarginal groove, pronotal punctures fine to 



moderate, more or less evenly distributed, without trace of transverse 



grooves, without marginal setae; Brazil martinezi, new species 



Pronotum not margined in front 25 



25. Edges of elytra not fimbriate or very inconspicuously ao 26 



Edges of elytra distinctly fimbriate 32 



26. Pronotum without trace of basal marginal line; Brazil. 



insulcatus (Schmidt) 

 Pronotum with complete basal marginal line 27 



27. Posterior tibia vidth a distinct but incomplete transverse ridge; edge of pro- 



notum distinctly crenate, larger punctures on pronotum irregularly placed 

 and absent anteriorly at middle and at extreme sides; New Jersey to 



Florida to Mississippi bidens Horn 



Posterior tibia without transverse ridge 28 



28. Larger pronotal punctures absent or very much finer over anterior third, 29 

 Pronotal punctures practically uniform in size almost to anterior margin; 



occipital band of punctures present 30 



29. Pronotal punctures relatively dense, separated by one or two diameters, 



gradually smaller anteriorly and at sides but those of anterior third much 

 finer than those on disc; occiput smooth, practically impunctate; small 



brown species 3 mm. in length; Mexico integer Bates 



Larger pronotal punctures absent over anterior third, sparse, irregularly 

 placed over basal two-thirds, separated by one to six or eight diameters; 

 Mexico formosus, new species 



30. Oblong, 3.5 by 1.6 mm,, piceous; Bolivia chipiririi, new species; 



Elongate subparallel, 3.0 by 1.2 mm., dark brown or rufopiceous; Bo- 

 livia 31 



31. Elytral intervals smooth, shining; Bolivia aenictus, new species 



Elytral intervals punctate and alutaceous; Bolivia . . atopus, new species 



32. Pronotum with more or less evenly placed fine to moderate punctures; 



Bolivia 33 



Pronotal punctures coarse, irregularly placed, surface uneven 34 



33. Pronotal punctures of disc quite dense, separated by one diameter or less; 



Bolivia fimbriatus, new species 



Pronotal punctures more widely scattered, separated by one to three or four 

 diameters; Bolivia mapirii, new species 



