28 GENERA OK HYMENOPTERA. 



Seutflluni ciipiiliform. bifovcate : thorax witlioiit panipsidal Krouves. 



Abiloiiun Willi tlif third sejriuent owupyiiit; nearly the entire surface; base of 

 abdomen with a hairy girdle : wings pubescent, often ciliate. 

 Antennte uioniliforni, gradually incrassated : 9 13, % lo-jointcd. 



Kui'oila Westw. 

 Antennte filiform, in 9 joints 3 7 suddenly narrowed. 4-7 being very short. 



9 13. % l.Vjointed Ilexaplastjt Forst. 



Abdomen without hairy girdle at base : scutellura unifovtatf : anlL-nnit as in 

 Eucoila, but with the three terminal Joints suddenly thickened. 



]CI<'id<»loiiisi Westw. 



The following is the chu5.sification of the Cynipidae proposed l)y 

 Dr. Mavr referred to above : 



k 



Females. 



o 



Wings rudimentary or wanting 



Wings fully developed ^• 



•2.— Scutellum terminating in an obtuse thorn ; (in American Oak-galls). 



20. Acraspis Mayr. 



Scutellum obtuse posteriorly 3. 



3._Parapsidal grooves entire ; antenna- distinctly H-Jointed ; from the front 

 extends an ol)tuse carina between the antennal insertions; head broader 

 behind the eyes ; ventral thorn only I-IV times as long as thick ; wing- 

 less, or with rudimentary wings: (in Oak-galls). ...22. Bio rhiza Westw. 

 Parapsidal grooves not entire; antennie 13-14-jointed ; no carina- between 

 the antennal in.sertions; head not wider behind the eyes; ventral thorn 

 2-2i times as long as thick ; wingless : (in Oak-galls :) aganions form. 



21. -Trigonaspis Hartig. 

 4,_Base of scutellum, behind anterior margin, without trace of fovea or trans- 

 verse groove •'' 



Base of scutellum with two fovea^ or a tran.sverse groove 6. 



5 _f)isc of scutellum not higher than mesothorax and without roundish im- 

 pression in the middle ; between the very highly inserted antenna- and 

 oct-lli are two short, deep antennal grooves, which are separated by a 

 carina; basal and cubital veins united by a single vein which lies be- 

 tween two elongate (juadrangular callosities; hypopygium (ventral plate 

 of la.st abdominal .segment) plough-share shaped, without prominent 



ventral thorn: (in .-k-«c((»-galls) 1. »Eschatocerus Mayr. 



Di.sc of scutellum higher than mesothorax. either intirely Hat, very deeply 

 wrinkle<l and with polished elevated margin lagamous form), or only 

 the middle with a round, deejdy wrinkled depression ; (in Maple-galls :) 



sexual form ^- ■ Pediaspis Tischb. 



(>.— The annular fir.st abdominal segment (not to be confounded with the .short 

 handle-.shaped prolongation of metathorax) deei)ly longitudinally fur- 

 rowed, second and third segments united without suture; the entire 

 face with sharp radiating furrows, frontal groove distinct, short or 



reaching to the lateral ocelli 7. 



First abdominal segment smooth; frontal groove entirely absent 8 



