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



and in the middle with an entire longitudinal groove; 

 marginal cell open at wing margin, very brown or pale 



brown at base; claws of posterior tarsi bidentate 



Amphibolips p. 404 

 XI. Cheeks, at most, half as long as eyes; antennae with apical 

 third thicker than joints five to six; marginal cell elongate 



and open at wing margin 14 



Cheeks more than half as long as eyes and without a furrow; 

 flagel filiform, apical third not thicker than joints five to 

 six; head not, or scarcely s wider behind eyes; prothorax 

 not narrowed medially, or at least not strongly con- 

 stricted; parapsidal grooves entire 12 



12. Base of scutel with two sharply impressed foveae; ventral 



spine, at most, a little longer than thick 13 



Base of scutel without foveae, but with a transverse furrow 



Solenozopheria p. 434 



13. Claws of posterior tarsi entire; mesothorax often more or 



less polished; base of scutel with two very sharply sepa- 

 rated foveae, which are more or less triangular or quad- 

 rangular, and often very large; large triangular lateral 

 foveae not extending upwards and inwards, but lying on the 

 free side of the scutel; antennae 13- to 14-jointed, third 

 joint shorter, or a little longer than the fourth.. .Aulax p. 374 

 Claws of posterior tarsi bidentate; mesothorax polished or 

 nearly so Diastrophus p. 435 



14. Genera not as in Andricus; metathoracic ridges, except in 



Loxaulus, not straight and parallel; base of scutel with a 

 transverse furrow, or with two sharply limited foveae, 

 in the latter case the metathoracic ridges in the middle 

 elevation of the metathorax strongly arcuate or angularly 



separated IS 



Base of scutel with two sharply separated foveae; metatho- 

 rax with straight parallel ridges, or inferiorly somewhat di- 

 vergent, rarely distinctly but not sharply serrulate, parap- 

 sidal grooves sharp and entire, often indistinctly defined 

 anteriorly; mesothorax rarely transversely wrinkled; an- 

 tennae and tibiae not fimbriate; third joint of antennae 

 longer than fourth or equal as in A. tubicola .. Andricus p. 409 



15. Claws of posterior tarsi entire; antennas and tibiae not fimbri- 



ate; mesothorax glabrous 16 



Claws of posterior tarsi bidentate, mesothorax often abun- 

 dantly hairy, scutel usually with an uninterrupted trans- 

 verse groove 17 



16. Parapsidal grooves of the polished or moderately deeply 



wrinkled mesothorax very sharply defined; antennae with 

 fourteen to fifteen joints, third as long as, or longer than 



