NORTH AMERICAN COLEOPTERA. 



3. — Form more slender, black, shining, thorax distinctly longer than wide, 

 punctuation single, intercoxal lines produced in front. 



13. angiistatiis. 



Form stouter, piceous or testaceous 4. 



4. — Thorax longer than wide, elytra less strongly striate, intercoxal Hues va- 

 riable iu front, color usually fuscous, or brown black, varying to dull 

 black or testaceous, punctuation of the thorax varying from single to 



double 14. «oiivexu!<i. 



Thorax not longer thau wide, punctuation single, intercoxal lines distinctly 

 confluent with antecoxal lines, color rufotestaceous, prothorax above and 



beneath in fuscate 15. floridae. 



5. — Second joint of antenna? longer than wide and more than one-half as long 



as the third 6. 



Second joint small, one-haif as long as the third 18. I 7 



6.--Prosternal process margined liehind the coxte 7. 



Prosternal process not margined liehind the coxje 10. 



7. — Basal strife of pronotum long 8. 



Ba.sal stria; of pronotum short 9. 



8. — More slender and shining, protliorax punctulate with sparsei- coarse j)unc- 



tures intermixed, pubescence fine and short 16. Jougior. 



Robust, dull black, scarcely shining, punctures of prothorax coarser, pubes- 

 cence longer and more conspicuous 17. nevatlensis. 



9.— Elytra black 18. gagates. 



Elytra partly or wholly red, hind coxae narrower 19. togatus. 



10. — Elytra partly red, tibise with very short and fine pubescence, siiines few 

 and distant, middle and hind tarsi with the first joint distinctly longer 

 " than the last, prosternal process scarcely elevated behind. 



20. EcIwaiMlsii. 



Elytra unicolorous, tibiae with longer pubescence and more or less thickly 



spinous, the middle and hind tarsi with the first joint equal to the last 



or shorter than it.. 11. 



11 — Prosternal process usually longer, but feebly ascending behind, except as 



noted in tenebrosus 12.* 



Prosternal process with lower surface strongly ascending behind 14. 



12. — Subopaque black ; prothorax as wide as the elytra, densely, strongly punc- 

 tulate, elytra more acute behind, intervals flat 21. latiuseiiliis. 



More shining; prothorax usually narrower than the elytra and finely punc- 

 tulate, elytra less acuminate behind, intervals more or less convex. 



13. — Prothorax less convex, basal strife longer 22. teiiebi'OSiiS. 



Prothorax more convex, basal strise shorter 23. coiive.xuliis. 



14. —Hind coxal plates strongly narrowed externally and broadly rounded, shin- 

 ing, usually feebly bi'onzed, jiubescence moderately long, not dense. 



24. criiiitiis. 

 Hind coxal plates moderately narrowed externally, the angles distinct and 



rounded 1.5. 



15. — Submarginal lines of prothorax short, thorax finely and rather closely punc- 

 tulate, pubescence rather dense and conspicuous pale cinereous, bristles 



fine 25. piibesreiis. 



Submarginal lines of prothorax well developed, sculpture coarser, opaque 

 or subopaque 16. 



