348 CONNECTICUT GEOL. AND NAT. HIST. SURVEY, [Bull. 



41. Thorax almost entirely black; scutel white or yellow 42 



Thorax not almost entirely black 44 



42. Apex of abdomen with a pale spot 43 



Apex of abdomen without a pale spot; abdomen above, ex- 

 cept base of first segment, entirely reddish. Length 9-12 

 mm laetus 



43. Hind coxae reddish. Length 7.5-10 mm velox 



Hind coxae black; thorax partly reddish. Length 9 mm maius 



44. Mesothorax and sometimes propodeum, more or less reddish 45 

 Propodeum with more or less whitish or yellowish marks. 



Length 14-17.5 mm w-album 



45. Hind tibiae without a pale annulus 46 



Hind tibiae with a pale annulus 50 



46. Hind tibiae reddish, except their tips, which are black 47 



Hind legs, except sometimes coxae, reddish; antennae with a 



pale annulus ; scutel yellow 51 



47. Antennae with a distinct pale annulus 48 



Antennae without a distinct pale annulus 49 



48. Areola and petiolarea not confluent, but separated by a raised 



line. Length 12.5 mm instabilis 



Areola and petiolarea confluent, not separated by a raised 

 line; length 12.5 mm,; see also description under 33..winkleyi 



49. Second dorsal abdominal segment with black or blackish 



stains; length 9.5 mm.; see also description under 34 . ,brittoni 

 Second dorsal abdominal segment reddish throughout. 

 Length 12.5 mm instabilis var. 



50. Length 5-7.5 mm annulipcs 



Length 10 mm signatipes 



51. Abdomen above with first to fourth segments more or less 



black at base. Length ii mm seminiger 



Abdomen above with first to fourth segments concolorous 

 with propodeum, which is pale reddish or bright reddish. 

 Length 12 mm. or more confirmatus 



52. Apex of abdomen without a pale spot 53 



Apex of abdomen with a pale spot, second and third dorsal 



abdominal segments each with a large black mark. 

 Length 10 mm disparilis 



53. Abdomen above entirely reddish 54 



Abdomen above not entirely reddish, but mostly so, second to 



fourth segments black or blackish at base. Length 11 

 mm. or more brevipennis 



54. Propodeum without prominent lateral tubercles; postpettole 



punctate above, anterior margin of clypeus truncate. 



Length 7.5 mm soror 



Propodeum without prominent tubercles, postpetiole either 

 smooth or indistinctly scratched; second dorsal segment 



