702 CONNECTICUT GEOL. AND NAT. HIST. SURVEY. [Bull. 



20. Propodeum sharply truncate behind and with a sharp edge; 



wing whitish nymphaearum 



Propodeum hardly truncate, with a blunt edge tegularis 



21. Abdomen not metallic 25 



Abdomen metallic, greenish or bluish 27 



22. Mesonotum shining; head not distinctly longer than broad.. 23 

 Mesonotum lusterless; head distinctly longer then broad 24 



23. Dark blue cseruleus 



Brassy green zephyrus 



24. Wings and pubescence yellowish „ pilosus 



Wings and pubescence whitish pruinosus 



25. Mesonotum rather coarsely punctate 26 



Mesonotum rather finely punctate; head hardly longer than 



broad 27 



26. Wings and veins whitish albipennis 



Wings and veins not whitish cressoni 



27. Abdomen dark 28 



Abdomen yellowish stramineous vierccki 



28. Abdomen more oval, more densely pubescent, the hairs less 



appressed; upper surface of propodeum not bordered by a 



raised line 29 



Abdomen obovate; first and second segments shining, third, 

 fourth, and fifth covered with sparse, closely appressed 

 hairs sparsus 



29. Abdomen blacker; third, fourth, and fifth dorsal abdominal 



segments less pubescent; raised lines of upper surface of 

 propodeum not reaching rear margin but falling far short 



thereof obscurus 



Abdomen brown; third, fourth, and fifth dorsal abdominal 

 segments closely pubescent versatus 



Males. 



1. Abdominal segments without apical pubescent fasciae 2 



Abdominal segments with apical pubescent fasciae 8 



2. Head and thorax neither dull greenish nor bluish 3 



Head and thorax dull greenish or bluish; fourth antennal joint 



as long as second and third combined, or nearly so; second 

 cubital vein present 7 



3. Head and thorax bright golden green 5 



Head and thorax black; clypeus anteriorly with a yellowish 



mark, or black and thinly pubescent 4 



4. Fourth antennal joint slightly shorter than second and third 



together; face subquadrate, apex of one mandible reaching 



to base of its fellow; tarsi dark coriaceus 



Fourth antennal joint longer than second and third together, 

 or only slightly longer than third 14 



5. Abdomen colored like head and thorax 6 



Abdomen black with yellow bands 10 



