PARASITICA — CYNIPID^. 33 



fovese; nietathorax with two striiijiht, parallel, loiiKitiidinal ridges; 



ventral spine, at most, scarcely twice as long as thick; marginal cell 



closed ; claws of posterior tarsi distinctly or indistinctly bidentate...l9. 



Abdomen with the second and third segments not united 20. 



19. — Autennte with 12 free joints, the third shorter, or at most as long as fourth, 

 tlagellum filiform ; prothorax with two more or less distinct carinula?, 

 converging above (backwards); mesothorax finely alutaceous punctate 

 and hairy, or (as in P. sylvestris O. S.) very finely and feebly alutaceous ; 

 claws of posterior tatsi bidentate; (in galls of Rubus and Rosa). 



9. Periclistus Forst. 



Antennaj 13-joiuted, the third very distinct, longer than fourth, apical joint 



thicker than the middle of the antennae,; prothorax without trace of a 



ridge extending upward ; mesothorax sharply transversely wrinkled ; 



claws of posierior tarsi bidentate ; (in African Rhtcs-gnUsj. 



10. *Rhoophilus Mayr. 



20. — Base of scutellum with an uninterrupted groove not externally closed ; mar- 

 ginal cell short and completely closed ; cheeks more than half as long as 

 the eyes; antennse with 13 free joints; prothorax not narrowed nie- 

 diall.v ; parapsidal grooves absent on anterior third of mesothorax, which 

 is sharply alutaceous punctate and opaque; claws of posterior tarsi en- 

 tire; (in Ceiitaurea stalks) 6. *Phanacis Fiirst. 



Base of scutellum either with an externally closed transverse groove or with 

 two fovete 21. 



21. — Scutellum with a very distinct, excavated, longitudinal, wrinkled furrow; 

 cheeks at least half as long as the eyes ; apical third of the 13- (or 14?) 

 jointed antennte not thicker than the middle ; head and thorax (espe- 

 cially the mesothorax) and scutellum, very deeply wrinkled and hairy ; 

 mesothorax with two distinct or indistinct, not polished, parapsidal 

 grooves; base of scutellum with moderately deep subciuadrate fovese, 

 the disc somewhat broader than long, obtusely rounded posteriorly and 

 in middle an entire longitudinal groove; marginal cell entirely open at 

 tlie wing margin, very brown or pale brown at base ; claws of posterior 



tansi bidentate; (in N. Am. Oak-galls) 16. Amphibolips Reinh. 



Otherwise formed ; scutellum without a distinct longitudinal groove lexcejit 

 in a species of Aulax, in which the claws are entire) 22. 



22. — Cheeks more than half as long as the eyes and without furrow ; flagellum 

 filiform, the a]iical third not thicker than joints 5-() ; head not or scarcely 

 wider behind the eyes; prothorax not narrowed medially, or at least 

 not strongly constricted : i)arapsidal grooves entire; base of scutellum 

 with two sharply imi)ressed fovea'; ventral spine, at most, a little longer 



than thick 23. 



Cheeks, at most, half as long as the eyes ; antennje with apical third thicker 

 than joints 5-6 ; prothorax small, or very small ; marginal cell elongate 

 and open at the wing margin 25. 



23. — Claws of posterior tarsi bidentate; mesothorax polished, in D. potentiUn' 

 Bass., nearly polished ; (in galls of Rubus and PotentUIn). 



15. Diastrophus Hartig. 



Claws of posterior tarsi entire ; mesothorax with distinct .sculpture, except 



in Aulax, where it is often more or less polished 24. 



