No. 22.] HYMENOPTERA OF CONNECTICUT. 353 



most entirely yellow, hind legs yellow with the excep- 

 tion of coxae described above; apical three-fourths of 

 hind femora and apical third of hind tibiae black; greater 

 part of apical half of first abdominal segment, dorsally 

 * and laterally, yellow; beyond first segment abdomen above 

 mostly reddish, with a little more than basal third of 

 second, and less than basal third of third to sixth seg- 

 ments, blackish; abdomen brownish yellow beneath; dor- 

 sulum may be entirely black, and pale portions of abdo- 

 men may be yellowish footei 



Length 12.5-14 mm.; mesothorax black, except two longi- 

 tudinal lines above; abdomen mostly yellow above and 

 with black bands; legs yellow or stramineous comptus 



41. Antennae with a pale annulus; postpetiole above smooth and 



polished 42 



Antennae without a pale annulus; postpetiole punctate above. 

 Length n mm mimicus 



42. Hind femora black. Length 7-10 mm paratus 



Hind femora fulvous. Length lo-ii mm vinnulus 



43. Abdomen mostly reddish above '. 44 



Abdomen mostly yellow above, ultimate, penultimate and 



antepenultimate dorsal segments, and even one additional 

 dorsal segment, black; legs entirely yellow. Length 16 

 mm milvus 



44. Apex of abdomen black or blackish, second to fourth dorsal 



abdominal segments more or less reddish; wings hyaline 



or subhyaline 45 



Apex of abdomen not black or blackish 50 



45. Antennae without a pale annulus; scutel more or less pale ... 46 

 Antennae with a pale annulus 48 



46. Hind coxae black and white, or black 47 



Hind coxae reddish. Length 6.5 mm citrifrons 



47. Postpetiole coarsely granulated above, not longitudinally 



rugose; hind coxae black and white. Length 15 mm. ...electus 

 Postpetiole above finely scratched; scutel convex. Length 

 12.5 mm instabilis 



48. Segments of apical portion of abdomen entirely black 49 



Segments of apical portion of abdomen with white maculae. 



Length 7.5-9 mm finitimus 



49. Coxae, trochanters and femora of hind legs, reddish. Length 



7.5 mm hospitus 



Coxae, trochanters and femora of hind legs black or nearly 

 black; length 8 mm.; wings transparent, and with a brown- 

 ish tinge leviculus 



50. Wings dark fuliginous or black 51 



Wings hyaline or subhyaline, sometimes reddish 55 



51. Antennae without a pale annulus; abdomen mostly reddish .... 52 



23 



