PARASITICA CYNIPID.E. 35 



Mesuthorax sharply, transversely wrinkled, parapsidal grooves feeble and 

 indistinct anteriorly; ( e at base of sciitelluni feeble and transverse; 

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

 tuse basal tooth; (in African i?feij»-galls) 10. *Bhoophilu8 Mayr. 



1,"). — Antennw 14-ir>-jointed. third joint shorter, ecjual to or a little longer than 

 fourth ; base of scntelluni with two very large or moderate foveie, the 

 lateral fovete lie in the appendicular sid^ of scutellura : (in galls on 



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



Antennse 14-jointe(l, longer and more slender than in Aulax, 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 fovete high up and inwardly reflexed ; (in Compositse- 

 galls) 5. ^Tlmaspis Mayr. 



It).— Metaihoracic ridges straight and parallel, or very slightly curved ; antennse 

 14-l()-jointed. third joint longer than fourth ; mesothorax with two 

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

 very distinct fovese ; abdomen usually not jiedunculate, rarely slightly 



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



Metathoracic carina.' strongly curved, rarely indistinctly so, in Lorauhia 

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

 antenna' lo-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 jwlished, 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 fovese, usually not shari)ly 

 defined; metathorax medially with two distant carina;; alxlomen with 



a distinct short iHJtiole ; (in Oak-galls) 24. 'Plagiotrochiis Mayr. 



Cheeks with a sharply defined furrow; head broader behind the eyes; ba.se 

 of scutellum with an arcu'.ite transverse furrow ; metathora,cic ridges 

 almost straight and i)arallel; abdomen not petiolate ; (in N. American 

 Oak-galls) 25. Loxaulus Mayr. 



19. -Reddish yellow; third joint of the mwlerately thick antenna' longer than 

 fourth, externally strongly emarginate and near the notch abruptly 

 thickened ; mesothorax jjolished ; ba.se of scutellum with two sharply 

 defined fovea;; abdomen not petiolate : (in Oak galls). 



•2-2. Biorhiza Westw. 



Antenna' thinner; mesothorax not reddish yellow and at the same time 



polished; abdomen distinctly petiolate 20. 



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

 ment vrtically declivous; (in Oak-galls) 2<!. •Dryocosmus Gir. 



Claws of po.sterior tarsi bidentate ; posterior margin of the upper side of 

 seeon-' abdominal segment i)roloiige<l obliquely in a tongue-like process; 

 head, thora.x and abdomen black ; mesothorax polished or nearly so ; 

 (in Oak-galls) ?H. Dryophanta Forst. 



