716 Mr. E. a. ELLIOTT ON THE 



(6.) 7. Temples without smooth space behind eyes ; prothorax with 

 an mflated ring between neck and semiannnlar ; hind 



femora ver^^ incrassate 4. tibiator Schlett. 



(3.) 8. Temples smooch. 



(22.) 9. Sheaths of terebra entirely black. 



(11.) 10. Frons coriaceo-granulate, legs entirely smooth ... 5. nigricauda Sichcl. 



(10.) 11. Frons arcuate or trans-rugose, legs distinctly sculptured. 



(15.) 12. Frons arcuate rugose. 



(14.) 13. Petiole shorter than rest of abdomen ; terebra about one-third [Schlett. 

 longer than bodj' ; head red Q. paclii/lomerus 



(13.) 14. Petiole longer than rest of abdomen; terebra half as long [Cam. 



again as body; head pale yellow, black banded. 7. xanthocephalus 



(12.) 15. Frons coarsely, irregularly, or transversely rugose. 



(17.) 16. A distinct sulcus across vertex and part of occiput ; terebra 

 nearly half as long again as body; wings infumate, 

 centrally darker 8. s?t?ci/j'o«.s Schlett. 



(16.) 17. No distinct sulcus on head or occiput. 



(19.) 18. Dark chestnut-brown ; sheaths of terebra blue-black. 



9. hrunneus Cam. 



(18.) 19. Head black ; body chiefly black. 



(21.) 20. Petiole and hind coxae coarsely transrugose; wings infuscate. 



10. unicolor Schlett. 



(20.) 21. Petiole finely trans-striate ; hind coxa3 smooth ; wings sub- 

 hyaline, iridescent 11. hornianus Enderl. 



(9.) 22. Sheaths of terebra white-banded before apex. 



(42.) 23. Posterior margin of head simple, not bordered or reflexed. 



(33.) 24. Terebra about as long as body. 



(30.) 25. Head black. 



(29.) 26. Second flagellar joint twice as long as first, third little shorter 

 rhan first and second together. 



(28.) 27. Mesonotum contiuently punctate ; hind femora shining, 



smooth 12. andmus Schlett. 



(27.) 28. Mesonotum irregularly rugose-punctate ; hind femora dull. 



13. sicJcmanni Schlett. 



(26.) 29. Second and tliird flagellar joints of equal length and little 



longer than first 14. crassicauda Morhy. 



(25.) 30. Head not black. 



(32.) 31. Head, anterior femora and tibiae niostlj^, and all tarsi red. 



15. tarsatus Sichel. 



(31.) 32, Head yellow, body dull ferruginous 16. texanus Cre&s. 



(24.) 33. Terebra distinctly longer than body. 



(35.) 34. Petiole basally smooth, head granulate, mesonotum coriaceo- 



punctate 17. europaiis Sichal. 



(34.) 35. Petiole basally striate, head and mesonotum otherwise 

 sculptured. 



(37.) 36. Mesonotum smooth, 2nd and 3rd flagellar joints of equal 



• length and little longer than first 18. j^or^ifs Morley. 



(36.) 37. Mesonotum more or less punctate. 



(41.) 38. Mesonotum rugose-punctate. 



(40.) 39. Median segment centrally densely punctate, laterally diffusely. 

 Head and thorax black, abdomen brown, petiole rufescent. 



19. anmnalipes Fst. 



(39.) 40. Median segment evenly rugose-punctate throughout. Head 

 and thorax ferruginous, abdomen red-brown, petiole 

 nigrescent 20. hicolor West w. 



(38.) 41. Mesonotum diff'usely punctate, median segment coarsely 



reticulate 21. jw^?*ica«s (Sichel). 



(23.) 42. Posterior margin of head bordered or reflexed. 



(60.) 43. Posterior margin of head bordered but not reflexed. 



