, PARASITICA — f'YNIPIDiE. ZV 



7. — Marginal cell fully closed; anteiiiue with 14 free joints; frontal groove 

 usually extending to the lateral ocelli or vei-y near them, rarely short : 



( in Oak-galls) 1-^ Synergus Hartig. 



Marginal cell ojven at the margin of the wing, the marginal nervure not 

 reaching to the wing margin ; anteunre with 13 free joints ; frontal 



groove very short; (in Oak-galls) i:5. Sapholytus Forst. 



H. — Face with two distinct parallel cariufe, extending from antennal insertion 

 to dypeus; antennfe with 12 free joints, third joint as long as fourth ; 

 hase of scutellum with two shallow fovea; ; metathorax with two par- 

 allel grooves; third abdominal segment larger than second, the two 

 connate, but with a fine suture between them, these forming the greatest 

 part of the abdomen; marginal cell entirely closed ; (in Oak-galls). 



11. Ceroptres Hartig. 



Face without such earinpe 9. 



!». — Hyjiopygium plough-share shajjcd, gradually narrowed to a fine point, with- 

 out prominent ventral spine ; mesopleuite on lower half with a strong, 

 often wrinkled or deeply punctured, longitudinal groove (except in the 

 American species R. diciuocerus) ; marginal cell very evidently completely 

 closed ; claws of jiosterior tarsi entire ; (in Bose-galls). 



4. Bhodites Hartig. 

 Hypopj'gium not prolonged in a fine point, usually emarginate beneath, and 



often with a very short ventral spine 10. 



10.— Anterior tibiae, on outer side at apex, prolonged in a spine, which is as long 

 as the adjacent .spur ; cheeks about two-thirds as long as the eyes, with a 

 furrow ; antenuie with 14 free joints and thickened from middle to apex ; 

 mesothorax with two sharp entire parapsidal furrows, and with straight 

 transverse p<).sterior margin ; base of scutellum with a very broad trans- 

 verse furrow, di.sc rectangular: second abdominal .segment above poste- 

 riorly widened and tongue-shajK-d ; marginal cell short, open at margin 

 of the wing, the surrounding vein thick and stjiined with brown ; claws 

 of ; -sterior tarsi entire; (in American Oak root-galls). 



3. Belonocnema Mayr. 



Anterior tibiie with a spine small or almost wanting 11. 



11, -The apjuirent sec(md abdcnninal segment (the second and third being con- 

 nate without trace of suture,) forms the entire abdomen, and overhangs 

 the last segment ; clypeus usually not distinctly separated (except often 

 in small individuals) ; from the middle of the front margin of the face 

 are many sharp radiating furrows ; me.sothorax very concave, trans- 

 ' vei"sely wrinkled, anteriorly without parapsidal grooves : claw.s of pos- 

 terior tarsi bidentate ; (in galls of Qnercus cerris). 



14. ■ Synophrus Hartig. 



Otherwi.se formed ; elyjteus present, at Ica-st defined at the sides 12. 



1_*. -A suture lietween mesothorax and scutellum ; anterior margin of .scutellum, 

 in front of the transverse groove, not thickened and carinate, or very 

 rarely feebly so; posterior margin of mesothorax medially arcuately 

 emarginate and laterally more ov less arcuately prolonged or rounded 

 out. each pronounced cmargination has also an interrupted transverse 

 fi.iTow, arcuately curved ; parapsidal grooves wanting or not distinctly 

 marked; anteunffi and tibiw without long hairs; (in Oak-galls). 



29. Neuroterus Hartig. 



