346 PROCEEDINGS OF THE NATIONAL MUSEUM vol. ne 



7« Markings yellow kennicottii kennicottii Cresson 



Markings cream kennicottii beali Scullen 



8. Extension near the clypeal border emarginate. 



convergens Viereck and Cockerell 

 Process not in the form of an emarginate lobe near the clypeal border ... 9 



9. Process broad and scoop shaped, much broader than long 10 



Process not scoop shaped; very low on the clypeus 12 



10. Mesosternal process absent poculum Scullen 



Mesosternal process present 11 



11. Clypeal process very broad with the apical border straight except for the 



extremities, which are curved downward; process cream except for black 



border chilopsidis Viereck and Cockerell 



Apical border of the clypeal process emarginate with the lateral angles ex- 

 tended and rounded at the apex; process black except (in some specimens) 

 for a small yellow spot in the center crandalli Scullen 



12. Clypeal process with its free margin converging to a blunt point, below which 



are two distinct denticles krombcini Scullen 



Clypeal process not converging to a point 13 



13. Center of face and clypeaus creamy white to white 14 



Center of face and clypeus black echo atrata Scullen 



14. Clypeal process subequal in width to the clypeal border extension ; pygidium 



pyriform acanthophila Cockerell 



Clypeal process about one-half as wide as the clypeal border extension; 

 pygidium oval in form neahminax Scullen 



15. Clypeal elevation somewhat cone shaped with a single point that may be 



more or less rounded or blunt but not truncate 16 



Clypeal elevation scoop shaped, definitely truncate or otherwise modified . 17 



16. Clypeal process pointing ventrad toward the clypeal border; without erect 



denticles ventrad of the single elevation argia Mickel 



Cone-shaped process approximately vertical to the clypeal surface with two 

 small erect black denticles ventrad of the cone-shaped process. 



conifrons Mickel 



17. Clypeal elevation a truncate cone 18 



Clypeal elevation not a truncate cone 19 



18. Silvery white markings; tegulae smooth and not elevated. 



crotonella Viereck and Cockerell 

 Yellow markings; tegulae pitted and elevated irene Banks 



19. Clypeal process scoop shaped; face largely reddish yellow . . blakei Cresson 

 Clypeal process not scoop shaped; face not reddish yellow 20 



20. Clypeal elevation reduced to little more than a short ridge parallel to the 



anterior clypeal border echo echo Mickel 



Clypeal elevation prominent and rounded with a deep incision on the anterior 

 margin; single dark denticles on the lateral borders of the incision. 



bridwelli Scullen 



21. Distinct red area covering one or more anterior terga of the abdomen and in 



some cases extending on to the propodeum of the thorax 22 



No red area on the abdomen or thorax 23 



22. Propodeum largely black rufinoda rufinoda Cresson 



Propodeum red except enclosure, which is black. 



rufinoda crucis Viereck and Cockrell 



23. Clypeal border with a thin lobed medial process butleri Scullen 



Clypeal border with two widely separated hyaline points 24 



