332 AMERICAN HYMENOPTERA. 



19. Abflomen entirely black, or with white margins 20. 



Abdomen more or less rufous 26. 



20. Mesopleura red ; hind tibiae with pale annulus ; femora black. 



Tryphon rufopectus Prov. 

 Mesopleura not red 21. 



21. Posterior tibiae with white annulus. 



Mesoleius (Tryphon) ejicavatus Prov. 

 Posterior tibiae not annulate with white 22. 



22. Abdomen yellow with base of segments beyond 1 black. 



Cteniscus crassipes Prov. 

 Abdomen not as above 23. 



23. Face and more or less of pleura yellow or white 24. 



Face and pleura not yellow or white 26. 



24. Abdomen entirely black; tarsi with pale annuli. 



Mesoleptus annulatipes Prov. 

 Abdomen with white markings 25. 



25. Margins of apical abdominal segments white Eclytus robustus Prov. 



Sides of abdominal segments obscurely white; hind coxae and apex of tibiae 



black ; metathorax carinate Mesoleptus fasciatus Prov. 



26. Clypeus white: abdominal .segments 2-4 with transverse impressions. 



Tryphon g-aspesianus Prov. 

 Clypeus red ; segments 1 and 2 rugose. 



Tryphon (Erromenus) bedardi Prov. 



27. Entire body uniformly ferruginous Mesoleptus uniformus Prov. 



Head and thorax lilack 28. 



23. Abdomen black at apex Tryphon tuberculifera Prov. 



Abdomen black only on basal segment Tryphon obscurus Cress. 



