306 GEO. H. HORN, M. D. 



Series A. — Antennae dissimilar in the sexes, serrate in 9 > pectinate or 

 flabellate % . 



Antennae £ flabellate, joints 4-10 bearing long branches, joints 2-3 small, globu- 

 lar; elytra at tip % simple ! . flab< I lata. 



Antennae % pectinate, joints 3-10 with stout branches, joint 2 small, globular ; 



elytraattip % slightly impressed 2. Crotchi. 



Series B. — Antennae subserrate in both sexes. 

 Posterior tibiae of males arcuate and obliquely grooved, elytra at tip simple in 



both sexes 3. abiiormis. 



Posterior tibiae slender and similar in the sexes 2. 



2. — Elytra at tip dissimilar in the sexes, that of the male either prolonged, im- 

 pressed or tipped with yellow and usually smoother 3. 



Elytra alike in the two sexes 11. 



3. — Elytra at tip % acutely caudate and tipped with yellow 4. 



Elytra simply tipped with yellow, not impressed nor bullate 5. 



Elytra at tip more or less bullate and distinctly impressed 6. 



4.— Elytra entirely black 4. distiiiguenda. 



Elytra with a nearly entire pellow vitta 5. Bardi. 



5. — Thorax shining without median impressed line. 



Thorax black 6. «'u aebris. 



Thorax red, rarely with darker median spot 7. puncl ulata. 



Thorax subopaque, a distinctly impressed median line 8. caiialiculata. 



6. — The elytral tip % yellow and impressed 7. 



The tip in % black, with impression 9. 



7. — Last two ventral segments % yellow, legs yellow 9. elegans. 



Abdomen entirely black in both sexes 8. 



8. — Thorax entirely red. 



Legs pale monticola- 



Legs black. 



Elytra sparsely punctured 10. terminal is. 



Elytra densely punctured 11. Lewisi. 



Thorax black. 



Legs pale 12. fulvipes. 



Legs black 13. Men inani. 



9. — Elytra blue, antennae, tibiae and tarsi pale 14. cj auipeuiiis. 



Elytra blackish, varying to red 10. 



10.— Legs yelldw 15. pulcbra. 



Legs entirely black. 



Clypeus pale yellow ; thorax red, with broad median space black, 



IB. labiata. 

 Clypeus black. 



Elytra with distinct pruinose surface lustre. 



Elytra rather densely punctured, thorax black 17. lugubris. 



Elytra coarsely and sparsely punctured, thorax red 18. collaris. 



Elytra shining without pruinose lustre variabilis. 



11.— Thorax nearly smooth, color red 19. incoiisuiciia.. 



Thorax conspicuously punctured, usually piceous, the elytra vitiate in £ , 



luteous in 9 20. vittata. 



1. — C. flabellata n. sp. — Piceous, thorax and legs reddish yellow. Head 

 and thorax with very few fine punctures. Elytra sliming, punctuation sparsi 



