No. 22.] HYMENOPTERA OF CONNECTICUT. 715 



Third antennal joint as long as, or longer than fourth and 



fifth joints combined 27 



12. Cheeks prominently angulate, or keeled 13 



Cheeks neither angulate nor keeled 20 



13. Cheeks prominently angulate, not keeled 14 



Cheeks keeled fragilis 



14. Mandibles toothed on under side near base; tooth on under 



side of mandibles a mere angle 15 



Mandibles not toothed on under side near base 16 



15. Pubescence of abdomen pale thaspii 



Pubescence of abdomen partly dark milwaukeensis 



16. Face without black pubescence 17 



Face with some black pubescence ., cockerelli 



17. Wings not clouded with brownish 18 



Wings, in part, distinctly clouded with brownish .nubecula 



18. Dorsulum dull 19 



Dorsulum polished < canadensis 



19. Abdomen dull, with ochreous, erect pubescence hirticincta 



Abdomen shining, with appressed pubescence *..... 



brunniventris rhodura 



20. Face with black hairs 21 



Face without black hairs 22 



21. Abdomen not fasciate carlini 



Abdomen fasciate bisalicis 



22. Tarsi yellowish 23 



Tarsi brownish or blackish 24 



23. Abdomen black; length 12 mm. or more nivalis 



Abdomen greenish; length 8 mm. or less salictaria 



24. Third antennal joint longer than fourth joint 25 



Third antennal joint as long as fourth joint vicina 



25. Abdomen not sericeous 26 



Abdomen sericeous ! commoda 



26. Length 8 mm placida 



Length more than 8 mm victima 



27. Angles of sixth ventral abdominal segment reflexed erigeniae 



Angles of sixth ventral abdominal segment not reflexed 36 



28. Wings with three closed submarginal cells • 29 



Wings with two closed submarginal cells 



andrenoides wellesleyana 



29. Cheeks not angulate : 30 



Cheeks rounded angulate miserabilis flavoclypeata 



30. Maculation confined to clypeus 31 



Maculation not confined to clypeus 34 



31. Third antennal joint as long as fourth and fifth joints com- 



bined, or a little longer 32 



Third antennal joint longer than fourth joint, but not as long 

 as fourth and fifth joints combined robertsoni 



