232 H. C. FALL. 



Metasternum distinctly shorter than the second and third ventrals united ; 

 punctuation simple, color castaneous 42. polilum. 



25. Form evidently gibbous in profile, or elytra narrowing posteriorly from the 



humeri or both 26. 



Form not distinctly gibbous in profile, elytra parallel 31. 



26. Intermixed coarser punctures at sides of pronotum either nearly lacking or 



relatively small and inconspicuous; coarser punctures of metasternum 

 nearly evenly distributed, not much more numerous at middle than 



at sides 27. 



Coarser punctures of pronotum strong and conspicuous 28. 



27. Size much smaller (1.4-2 mm.). Texas 43. triviale. 



Size larger (2.3-3 mm.). 



More elongate, coarser punctures of elytra distinct. (California). 



44. con ju lie turn. 



Less elongate, coarser punctures scarcely detectable at any part. (Lake 



Superior) 45. boreale. 



28. Form short and stout, pubescence relatively dense 46 pusilljiin. 



Form more elongate, pubescence sparser 29. 



29. Hind coxal plates and sides of metasternum nearly or quite impunctate- -30. 

 Hind coxal plates punctate, metasterual punctures nearly as numerous at 



sides as at middle. 

 Less elongate, fine punctnlatiou of metasternum nearly absent. (Arizona, 



New Mexico) 47. coiisobriiuim. 



More elongate, fine punctulation of metasternum quite distinct. (Florida). 



.48. simile. 



30. Coarser punctures of pronotum and elytra only moderate in size and num- 



ber, form robust, elytra evidently narrowed from the humeri. (Ari- 

 zona) 49. piugue. 



Coarser punctures moderately strong, form rather strongly gibbous in profile, 

 but less robust and nearly parallel. (Arizona, Texas). 



50. vac uu in. 



Coarser punctures unusually strong and numerous, elytra not at all narrowed 

 from the humeri. (Florida) 51. cicatricOKiilll. 



31. Densely pubescent, surface sculpture nearly invisible- .52. liiteoteeliim. 

 Moderately pubescent, surface sculpture evident 32. 



32. Coarser punctures of elytra arranged in geminate series. 



53. geminatiim. 

 Coarser punctures of elytra irregularly placed, at least without distinct indi- 

 cation of double lines 33. 



33. Lateral striae of elytra well developed 35. 



Inner lateral stria feeble or indistinct 34. 



34. Size smaller (under 2 mm.) and more elongate, coarser punctures virtually 



lacking, even on the metasternum, first joint of antennal club strongly 



transverse and triangular. (Ohio) 54. gracile. 



Larger and stouter, coarser punctures evident, first joint of antennal club a 

 little longer than wide. (California) 55. mancum. 



35. Size large (3.4-4 mm.), coarser punctures of metasternum few and very fine, 



color pale brown 56. valid mil. 



Size medium (2-2.7 mm.), coarser punctures of metasternum moderate in 

 size and number, color blackish brown. 



