NORTH AMERICAN COLEOPTERA. 69 



5. — Opaque species ; thorax without basal margiual Hue ; head densely finely 

 punctured, not rugulose ; posterior tibise without accessory spinule. 



Elytral intervals flat iiiibriratiis. 



Elytral intervals alternately moi'e elevated altcriiatiis. 



Shining species; thorax with basal marginal line 6. 



6. — -Posterior tibiiE witliout accessory spinule 7 



Posterior tibia3 with accessoiy si)inu!e 12. 



7. — Pale reddish brown species. 



Strife of elytra puuctulate, intervals smooth sooialis. 



Strife, impuuctate, intervals biseriately punctulate piiiii'ticollis. 



Piceous or black species 8. 



8. — Head simply punctulate, not rugulose 9. 



Head wrinkled and rugose at the sides 11. 



9. — Elytral intervals very flat; abdomen nearlj- smooth at middle. .Weiiieelii. 



Elytral intervals convex ; abdomen coarsely punctured 10. 



10. — Elytra oblong oval, base slightly emarginate; form rather robust ; marginal 



line of posterior femur entire ovalulus. 



Elytra elongate, parallel, base truncate ; form slender, elongate ; marginal 



line of posterior femur very short or absent gracilis. 



11. — Form slender; thorax coarsely sparsely punctate; abdomen nearly smooth; 



marginal line of posterior femur absent figurator. 



12. — Intervals of elytra very flat, densely punctured, the punctures nearly as 

 coarse as those of the thorax; form short and robust; marginal line 



of posterior femur abbreviated robustus. 



Intervals convex, rarely punctate 13. 



13. — Abdomen coarsely punctured from side to side 14. 



Abdomen coarsely punctate at sides, finely or nearly smooth at middle.. -.15. 

 14.— Elytral strife catenulate punctate; head densely punctured; posterior femur 



coarsely punctate, the marginal line entire obloiigus. 



Elytral strife simply punctate ; head wrinkled in front, without coar.se punc- 

 tures on occiput; posterior femur nearly smooth, the marginal line 



short iiiquisitus. 



1.5. — Elytra smooth, not pubescent 16. 



Elytra with short erect hairs arising from punctures 21. 



16.~Clypeus finely punctured, without traces of rugfe; occiput with coarse punc- 

 tures; posterior femur with deep marginal line extending two-thirds 



to base strigatus. 



Clypeus transversely wrinkled or coar.sely punctured 17. 



17.— Elytra i)arallel, the base nearly squarely truncate ; abdomen with numerous 



coarse punctures at the sides, fewer and finer at middle 18. 



Elytra somewhat oval, distinctly emarginate at base 20. 



18.— Posterior femur with deep, marginal groove extending from knee nearly 

 half to base; thorax without coarse punctures antero-medially. 



stercoral or. 

 Posterior femur with at most a fine and feeble marginal line near tlic kiue. 



usually absent 19. 



19.— Tiie coarse punctures of thorax moderate in .size, the finer intermixed. 



punctures very distinct oogiialiis. 



The cofu-se punctures of thorax large, the finer jiunctures scarcely evidcni. 



caliroriiiciiM. 



