PARASITICA — CYNIPIDiE. 35 



Mesothorax sharply, transversely wrinkled, parapsidal frrooves feeble and 

 indistinct anteriorly; fovea' at base of scntelluni feeble and transverse; 

 marginal cell entirely closed ; claws of posterior tarsi with a small, ob- 

 tuse basal tooth ; (in African Rhi(s-^a,\\s) Kt. -Bhoophilus Mayr. 



15. — AntenniE 14-15-jointed, third joint shorter, equal to or a little longer than 

 fourth ; base of scutellum with two very large or moderate fovese, the 

 lateral foveas lie in the appendicular side of scutellum; (in galls on 



various herbaceous and bushy plants) 7. *Aulax Hartig. 



Antennse 14-jointed, longer and more slender than in Aiilax, third joint 

 twice, or almost twice as long as fourth ; mesothorax shorter than usual ; 

 base of scutellum, immediately behind posterior margin, with a small, 

 short groove, which is more or less interrupted medially by a small 

 carina, the lateral fovese high up and inwardly retiexed ; (in Compositse- 

 galls) 5. ®Timaspis Mayr. 



16.— Metaiboracic ridges straight and parallel, or very slightly curved ; autennfe 

 14-16-jointed, third joint longer than fourth ; mesothorax with two 

 sharply defined, entire paraiisidal grooves; base of scutellum with two 

 very distinct fovese ; abdomen usually not pedunculate, rarely slightly 



so: (in Oak-galls) 17. Andricus Hartig. 



Metathoracic carina; strongly curved, rarely indistinctly so, in Loxaulus 

 almost straight, in which case the scutellum has a transverse groove ; 

 antennse 15-jointed 17. 



17. — Parapsidal grooves feebly defined or wanting ; mesothorax finely alutaceous ; 



claws of posterior tarsi entire 18. 



Parapsidal grooves sharply excavated and entire : mesothorax polished, or 

 moderately coarsely wrinkled 19. 



18. — Cheeks without or with only a feeble furrow ; head not broader behind the 

 eyes; base of scutellum with two transverse fovea', usually not sharply 

 defined ; metathorax medially with two distant carinte ; abdomen with 



a distinct short petiole ; (in Oak-galls) 24. *Plag-ioti'ochiis ^fayr. 



Cheeks with a sharply defined furrow; head broader behind the eyi-s; base 

 of scutellum with an arcuate transverse furrow; metathoracic ridges 

 almost straight and parallel: abdomen not petiolate; (in N. American 

 Oak-galls) 25. Loxaulus Mayr. 



19.— Eeddish yellow; third joint of the moderately thick antenna> longer than 

 fourth, externally strongly emarginate and near the notch aliruptly 

 thickened; mesothorax polished; base of scutellum with two shai-ply 

 defined fovese; abdomen not petiolate ; (in Oak galls). 



22. Biorhiza Westw. 



Antenna- thinner: mesothorax not reddish yellow and at tiie same time 



polished ; abdomen distinctly pi'tiolate 20. 



20.— Claws of posterior tarsi entire; posterior margin of .second abdominal seg- 

 ment vertically declivous; (in Oak-galls) 2(5. '-Dryocosmus Gir. 



Claws of posterior tarsi l)identate ; posterior margin of the uiijier side of 

 second abdominal segment pn)longed obli(|uely in a tDugue-like ju-oecss; 

 head, thorax and abdomen black: mesotlxirax polished or nearly so; 

 (in Oak-galls) 2S. Dryophanta Fiirst. 



