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



reddish; thorax mostly black, striped and marked with 



reddish perplexa 



Basal vein interstitial with nervulus; apex of hind tibiae with 

 black, curved bristles; abdomen immaculate, reddish; head 

 and thorax mostly reddish; dorsulum with a black stripe 



incerta 



13. Propodeum with two yellow patches 14 



Propodeum entirely black '. 16 



14. Abdomen with five yellow fasciae 15 



Abdomen with four yellow fasciae; mesonotum coarsely 



punctate, pubescent; basal vein before nervulus; flagel 

 reddish imbricata 



15. Mesonotum finely punctate, pubescent; basal vein inserted 



before nervulus; flagel dark above affabilis 



Mesonotum strongly punctate, nearly bare; basal vein 

 virtually interstitial with nervulus; flagel with a dark 

 annulus vincta 



16. First to third dorsal abdominal segments with an interrupted 



yellow band, fourth and fifth with a continuous yellow 

 band; scutel with a yellow spot on each side; postscutel 

 with a yellow band;, head, thorax, and abdomen mostly 



black ; legs mostly red electa 



First dorsal abdominal segment black or with a reddish stain, 

 second and third segments with interrupted, fourth and 

 fifth with continuous bands; basal vein not inserted before 

 nervulus; scutel hardly bilobed; third antennal joint some- 

 times a little shorter than fourth placida 



17. Head and thorax without yellow ornaments, basal vein before 



nervulus 18 



Head and thorax with yellow ornaments 23 



18. Head and thorax red, sutures black; scutel crested, bilobed.. 19 

 Head and thorax black, with reddish ornaments; abdomen 



black, with yellow ornaments; an interrupted line on first 

 dorsal segment, lateral marks on second and third dorsal 

 segments, continuous fasciae on fourth and fifth segments 



vicina 



19. Fourth antennal joint as long as twelfth or longer 20 



Fourth antennal joint shorter than twelfth; a spot on each 



side of second and third segments, and usually a band or 

 two spots on fifth; pygidium broadly rounded, closely 

 pubescent illinoiensis 



20. Fourth antennal joint as long as twelfth 21 



Fourth antennal joint longer than twelfth; no spot on first 



and second dorsal abdominal segments, and the inter- 

 rupted band on third, fourth and fifth segments almost 

 entirely luteous rubicunda 



