154 



CUKCULIONID^E. 



[LeCoute. 



elytra are prolonged into an acute spine, and the beak of the $ is 

 frequently shorter and stouter than in the 9 



A. Beak rather stout, subcarinate 2 . 



B. " " " not carinate 3. 



O. " more slender, not carinate, except in sylmus 4. 



2. Basal excavation of prothorax deep; surface above 



thinly clothed with gray pubescence ; sides of 

 prothorax, elytra and under surface densely 



white pubescent 1. pleuralis. 



3. Basal excavation of prothorax broad, not deep, 



surface dull, finely pubescent 2. texanus. 



4. Antennae moderately slender, first joint of funicle 



stouter than second 5. 



Antennae longer, more slender, first and second 

 joints of funicle equal, each as long as the four 



following united 17. 



5. Tips of elytra prolonged, pubescence pruinose ... 6. 



" not prolonged 9. 



6 . Body very elongated 7. 



" less elongated ; pubescence less fine, gray 8. 



7. Pubescence gray, very fine 3. rubelhis. 



" yellowish, denser 4. auctus. 



8. Tips of elytra long 5. caudifer. 



" " very short ; prothorax asperate. .... 6. asper. 



9. Beak strongly, though not coarsely punctured. ... 1O. 



" finely, densely punctulate 12. 



" sparsely punctulate or nearly smooth ; an- 

 tennae inserted about the middle of the length; 



basal concavity of prothorax feeble 15. 



10. Beak obsoletely carinate 11. 



'* distinctly " 7. Sylvius. 



11. Prothorax with shallower punctures 8. punctinasus. 



" " few deep " (smaller).... 9. parcus. 



12. Antennae inserted ^ | from the tip 13. 



" " near the tip, prothorax not 



rounded on the sides 1O. terminalis. 



13. Prothorax shorter, rounded and sub-sinuate on 



the sides ^ 14. 



Prothorax long, not rounded on the sides 11. rectus. 



14. Body long, elytral impressions not deep 12. mucidus. 



" " " " deep 13. concavus. 



" shorter and stouter than usual 14. musculus. 



15. Elytra conjointly rounded at tip 16. 



" sub-acuminate at tip 15. perforatus. 



16. Prothorax with sides rounded in front 16. scrobicollis. 



