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



29. Apex of abdomen entirely black or blackish brown or yel- 



low; antennae without a pale annulus .' 30 



Apex of abdomen mostly black, margined with white or yel- 

 low 39 



30. Second and third dorsal abdominal segments yellow and 



black 31 



Second and third dorsal abdominal segments yellow at base Kt 

 or apex and sometimes centrally fuscous or reddish. 

 Length 1 1-14 mm versabilis 



31. Second and third dorsal abdominal segments more or less 



black at apex 32 



Second and third dorsal abdominal segments more or less 



black at base, apex of abdomen black 35 



32. Fourth dorsal abdominal segment not partly yellow 33 



Fourth dorsal abdominal segment partly yellow 34 



33. Abdomen dull, postpetiole scratched, gastrocoeli transverse; 



propodeum generally more or less yellow. Length 15-16 



mm comes 



Abdomen shining, postpetiole smooth and polished, gas- 

 trocoeli linear; entirely black. Length 10-12. 5 mm wilsoni 



34. Abdomen otherwise as in comes or nearly so; body as long as 



in comes comes var. aleatorius 



Apex of abdomen black, gastrocoeli deep, first dorsal seg- 

 ment entirely black. Length as in comes comes var. 



35. Length less than 15 mm 36 



Length 15 mm. or more 37 



36. Length 9 mm parvus 



Length 6-7 mm.; pale orbital lines interrupted posteriorly.. 



parvus var. 



37. Length 17 mm.; color nearly as in comptus, but abdomen 



above mostly black, and with four conspicuous yellow 

 transverse bands and with an indistinct fifth transverse 



yellow band; legs black and yellow quadrizonatus 



Color not nearly as in comptus 38 



38. Pale orbital lines interrupted posteriorly. Length 15-16 mm. 



Isetus 

 Pale orbital lines not interrupted posteriorly, but entire. 

 Length 16-19 mm munificus 



39. Mesothorax mostly black, maculated 40 



Mesothorax entirely black; abdomen mostly black above 



and with yellow or whitish transverse bands. Length 

 14-16 mm ; flavizonatus 



40. Length 13 mm.; cheeks black, antennae mostly black, scape 



and pedicel partly yellow; mesothorax mostly black, only 

 a yellow line above and below insertion of wings; wings 

 tinted with brown, veins mostly dark brown, stigma pale 

 brown; hind coxae entirely black; fore and mid legs al- 



