No. 22.] HYMENOPTERA OF CONNECTICUT. 695 



Cerceris Latreille. 

 Key to Species. 



1. Males 



Females 



2. Hind femora pale at base and black at apex 3 



Hind femora black, pale, or black at base and pale at apex 6 



3. Propodeal enclosure broad, almost entirely smooth; lateral 



spots on first segment of abdomen; clypeus swollen out 



transversely above middle fasciola 



Propodeal enclosure striate 4 



4. Clypeus flat, broadly truncate in front, with a transverse de- 



pression before apex; face only slightly hairy; first dorsal 

 abdominal segment with spots; last ventral segment only 



slightly emarginate at tip deserta 



Clypeus convex, rather rounded below and with no trans- 

 verse depression before apex 5 



5. Enclosure finely evenly striate; abdomen very slender, first 



segment narrow; usually but four or five teeth above on 



hind tibia imitatoria 



Enclosure more coarsely striate; abdomen broader, more 

 coarsely punctate; six to eight teeth above on hind tibia 



clypeata 



6. Scutellum not pale, but metanotum yellow; wings black.... 



fximipennis 

 Scutellum marked with pale; wings hyaline or subhyaline.. 7 



7. A tooth or a ridge on each side of mesosternum; hind 



femora black ; no stripes on propodeum compar 



No tooth or ridge on mesosternum 8 



8. Metanotum black; apical joint of antennae longer than pre- 



ceding, and concave within at tip robertsoni 



Metanotum yellow; apical joint of antennae subequal with 

 preceding compacta 



9. Clypeus more or less swollen, but without an elevation with a 



free apical edge 10 



Clypeus with an elevation or process which has a free apical 

 edge II 



10. Wings black; abdomen with exception of second segment (in 



part) black fumipennis 



Wings subhyaline; abdominal segments with pale bands... 



fulvipediculata 



11. Clypeal process erect and as long as broad cljrpeata 



Clypeal process broader than long or not erect 12 



12. A lamella from tip of clypeal process 13 



No lamella from tip of clypeal process 14 



I3« Clypeal lamellae small, not half the width of the process 



robertsoni 



