No. 22.] HYMENOPTERA OF CONNECTICUT. 369 



pronounced emargination having also an interrupted trans- 

 verse furrow, arcuately curved; notauli wanting or not dis- 

 tinctly marked; antennae and tibiae without long hairs.... 



Neuroterus p. 384 



8. Abdomen without silky pubescence, almost entirely or en- 



tirely without hairs; apical third of antennae not thinner 

 than middle third; body not at all yellow, polished; disk 

 of scutel margined; claws of hind tarsi distinctly or indis- 

 tinctly bidentate or entire 9 



Abdomen, especially from the third to the last segment, en- 

 tirely or at least on lower two-thirds, covered with a rich 

 silky pubescence, pretty much the same as head, thorax 

 and legs; head much widened behind the eyes; mesotho- 

 racic ridges parallel or nearly so. Agamous form: claws of 

 posterior tarsi bidentate; antennae with second joint as 

 long as or longer than thick; notauli complete, scutel some- 

 what broader than long, its base with two transverse fur- 

 rows each closed externally by a carina Cynips p. 403 



9. Abdomen with second and third segments not united; base 



of scutel either with an externally closed transverse groove 



or with two foveae 10 



Abdomen with second and third segments united, without or 

 rarely with a trace of separating suture, so that only six 

 free segments appear, segments two to three forming 

 almost the entire abdomen; cheeks without furrow, the 

 front laterally striped; head not wider behind eyes; pro- 

 thorax not narrowed medially; base of scutel with two 

 sharply marked foveae; metathorax with two straight par- 

 allel longitudinal ridges; ventral spine at most scarcely 

 twice as long as thick; marginal cell closed; antennae 12- 

 jointed; the third shorter, or at most as long as the 

 fourth; flagel filiform; prothorax with two more or less 

 distinct carinulae converging above backwards; meso- 

 thorax finely alutaceous, punctate and hairy, or, as in 

 P. sylvestris, very finely and feebly alutaceous; claws of 



posterior tarsi bidentate Periclistus p. 27i 



10. Genera not as in Amphibolips; scutel without a distinct longi- 

 tudinal groove, except in the species of Aulax, in which 



the claws are entire 1 1 



Scutel with a very distinct excavated longitudinal wrinkled 

 furrow; cheeks at least half as long as eyes, apical third 

 of 13- or 14-jointed antennae not thicker than the middle; 

 head and thorax, especially mesothorax and scutel, very 

 deeply wrinkled and hairy, mesothorax with two distinct 

 or indistinct, not polished, parapsidal grooves; base of 

 scutel with moderately deep subquadrate foveae, the disk 

 somewhat broader than long, obtusely rounded posteriorly, 



24 



