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



Third, fourth and eighth ventral abdominal segments flat, 

 smooth, without a longitudinal median ridge or fold; scutel 

 flat or simply convex 6l 



2. Abdomen mostly black or blue 3 



Abdomen mostly yellow or reddish 43 



3. Abdomen black or blue, without pale bands or spots, except 



sometimes on apex of first or apical segment 4 



Abdomen black and yellow, sometimes partly reddish 28 



4. Hind legs not entirely black 5 



Hind legs entirely black 21 



5. Hind legs not reddish 6 



Hind legs mostly reddish, their coxae black; apical abdominal 



segment white; face black, narrowly pale laterally; scutel 

 whitish apically helvipes 



6. Hind tibiae, only, more or less white 7 



Hind coxae, hind femora and hind tibiae more or less white; 



scutel white only laterally; abdomen blue; propodeum 

 with white maculations pulcher 



7. Antennae black, except for a pale annulus; abdomen immacu- 



late at apex 8 



Antennae entirely black 12 



8. Postpetiole with a white mark or band at tip 9 



Postpetiole entirely black 10 



9. Propodeum immaculate unifasciatorius 



Propodeum with two white maculae posteriorly ....sublatus var. 



10. Hind tibiae without an entire white annulus, but with a 



white line above, toward base 11 



Hind tibia? with an entire white annulus at base; apex of 

 abdomen immaculate, petiole above entirely black; hind 

 trochanters white, scutel white laterally. Length 10-11 

 mm navus 



11. Propodeum immaculate; annulus on antennae complete. 



Length 11-14 mm sagus 



Propodeum with a white spot on each side of the middle; 

 annulus on antennae interrupted beneath. Length 12.5- 

 14 mm sublatus var. proximus 



12. Postpetiole entirely black; scutel pale; apex of abdomen 



black 13 



Postpetiole with a white spot or band at apex 19 



13. Propodeum immaculate 14 



Propodeum with two white spots behind. Length 12.5-14 



mm sublatus 



14. Hind tibia? white or yellow, black at tips 15 



Hind tibiae black, with a white line above; face white laterally, 



black down the middle 17 



15. Wings subhyaline 16 



Wings fuscous. Length 16 mm bronteus 



