AMERICAN COLEOPTERA. 113 



2. Setse of the strial punctures minute, recumbent and lying entirely within 



the punctures 12. californicus. 



Setse of the strial punctures much longer aud distinctly bristling 3. 



3. Elytra with pale recumbent hairs in addition to the erect seta 5. 



Elytra without recumbent hairs, prevailing color black 4. 



4. Prothoracic constriction smooth and polished, elytral punctures not stellate, 



oblique at base 13. Mtraiigiilatii*. 



Prothoracic constriction granulate like the rest of the surface, elytral punc- 

 tures stellate, not oblique at base; head, prothorax, and sometimes the 

 base of the elytra rufous 14. I alii . 



5. Disk of prothorax strongly elevated and compressed 16. I iimirius. 



Disk of prothorax normally convex ... 6. 



6. Color throughout nearly uniformly testaceous or brown 15. 



Black, the humeri and apex of the elytra bright rufous; posthumeral and pos- 

 terior fascia of white recumbent hairs conspicuous; form rather short 

 and stout 15. I>ima<>u la I us. 



Rufous, the elytra with a broad black or piceous median fascia which is inter- 

 rupted at the suture; base, suture and apex usually conspicuously 

 pale, but sometimes more or less completely suffused with the darker 

 color 7. 



7. Vestiture very long, elytral punctures coarse, the interspaces relatively nar- 



row, but little if any wider than the punctures 19. liystrix. 



Vestiture shorter, interspaces of elytra at middle of disk usually nearly or 

 quite twice as wide as the punctures- . • 8. 



8. Oblique discal dash of pale hairs limited to a spot on the third interspace; 



color nearly piceous throughout, the base and apex of the elytra some- 

 times obscurely rufescent ; size large 20. eximiiis. 



Oblique median dash of pale hairs extending onto the fourth interspace, base, 

 apex and suture of the elytra distinctly rufous, except frequently in 

 vegrandis 9 . 



9. Form moderately elongate, the auteunse of the male not or scarcely as long as 



the body, feebly serrate, the joints elongate-triangular, the tenth from 



two to three times as long as wide 11. 



Form very elongate in the male, the antennae in this sex fully as long as 

 the body, the joints filiform, the tenth fully four times as long as 

 wide 10. 



10. Prothorax distinctly tumid on the median line just before the constriction. 



17. prolixus. 

 Prothorax not distinctly tumid 18. quadriiiiac'iilatus. 



11. Eyes of male very large and prominent, separated on the front by a distance 



which is subequal to their vertical diameter 12. 



Eyes of male relatively smaller and separated on the front by a distance 

 which distinctly exceeds their vertical diameter 13. 



12. Last ventral of male with the apical pubescent tubercle indistinct or feebly 



developed (Texas) 21. texaini*. 



Last ventral of male with well defined tuft of hairs surmounting a feeble 

 apical elevation (California) 22. interrupt us. 



13. Last ventral of male with well developed apical tubercle; strial punctures 



coarser (Illinois, Arkansas) 23. coiicurreiis. 



TRANS. AM. ENT. SOC. XXXI. (15) MARCH, 1905. 



