PARASITICA — CYNIPID.E. 29 



7. — Margiiiiil cell fully i-losed ; aiitenna- with 14 free joints; frontal groove 

 usually extending to tlie lateral ocelli or very near tlieni, rarely short; 



(in Oak-galls) 12. Synergus Hartig. 



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

 I'eaching to the wing margin; antenna? with i:i free joints; frontal 



groove very short; (in Oak-galls) 13. Sapholytus Fov.st. 



8. — Face with two distinct parallel cariniB, extending from antennal insertion 

 to clypeus; antennie with 12 free joints, third joint as long as fourth ; 

 base of scutellum with two shallow fovese ; metathorax with two par- 

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

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

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



11. Ceroptres Hartig. 



Face without such carinse 9. 



9. — Hypopygium plough-share shai)ed, gradually narrowed to a fine point, with- 

 out prominent venti'al spine ; mesopleurse on lower half with a strong, 

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

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

 closed ; claws of posterior tarsi entire ; (in Kose-galls). 



4. Rhodites Hartig. 

 Hypopygium not prolonged in a fine point, usually emarginate beneath, and 



often with a very short ventral spine 10. 



10.— Anterior tibiie, 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 ; antennae with 14 free joints and thickened from middle to apex ; 

 mesothorax with two sharp entire parapsidal furrows, and with straight 

 transverse posterior margin ; base of scutellum with a vei-y broad trans- 

 verse furrow, disc rectangular: second abdominal segment above poste- 

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

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

 of posterior tar.si entire; (in American Oak root-galls). 



3. Belonocnema Mayr. 



Anterior tibise with a spine small or almost wanting II. 



11. — The apparent second abdominal 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 (excei)t often 

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

 are many sharp radiating furrows ; mesothorax very concave, trans- 

 versely wrinkled, anteriorly without parapsidal grooves; claws of pos- 

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



14. ■ Synophrus Hartig. 



Otherwise formed; clypeus lu'esent, at lea.st defined at the sides 12. 



12. — A suture between mesothorax and scutellum ; anterior margin of scutellum, 

 in front of the transver.se groove, not thickened and carinate, or very 

 rarely feebly so; posterior margin of mesothorax medially arcuately 

 emarginate and laterally more or less arcuately prolonged or rounded 

 out, each pronounced emarginalion has also an interrupted transverse 

 furrow, arcuately curved ; i)arapsidal grooves wanting or not distinctly 

 mai-ked ; antennae and tibia' without long hairs; (in Oak-galls). 



2!l. Neuroterus Hartig. 



