28 . GENERA OF HYMENOPTERA. 



Scutellum cupuliform, bifoveate ; thorax without parapsidal grooves. 

 Abdomen with the third segment occupying nearly the entire surface; base of 

 abdomeu with a hairy girdle ; wings pubescent, often ciliate. 

 Antennte moniliform, gradually incrassated ; 9 13, % lo-Jointed. 



Eucoila \Ve.stw. 

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



9 13, % ir>-jointed He.YaplaNta Fiirst. 



Abdomen without hairy girdle at base; scutellum unifoveate ; antennie as in 

 Eucoila, but with the three terminal joints suddenly thickened. 



Kleidotoma Westw. 



The following Is the classification of the Cynipidae proposed by 

 Dr. Mayr referred to above : 



Fanales. 



Wings rudimentary or wanting 2. 



Wings fully developed 4. 



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



20. Acraspis Mayr. 



Scu.ellum obtuse posteriorly 3. 



3. — Parapsidal grooves entire ; antennae distinctl.y 14-jointed ; from the front 

 extends an obtuse carina between the antennal insertions ; head broader 

 behind the eyes ; ventral thorn only 1-1 J times as long as thick ; wing- 

 less, or with rudimentary wings; (in Oak-galls).... 22. Biorhiza Westw. 

 Parapsidal grooves not entire; antennae 13-14-jointed ; no carinse between 

 the antennal insertions ; head not wider behind the eyes ; ventral thorn 

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



21. • Trigonaspis Hartig. 

 4. — Base of scutellum, behind anterior margin, without trace of fovea or trans- 

 verse groove 5. 



Ba.se of scutellum with two foveas or a tran.sverse groove 6. 



5. — Disc of scutellum not higher than mesothorax and without roundish im- 

 pression in the middle ; between the very highly inserted antenuie and 

 ocelli are two .short, deep antennal grooves, whioh are separated by a 

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

 tween two elongate quadrangular callosities; hyi)opygium (ventral plate 

 of last abdominal segment) plough-share shaped, without prominent 



ventral thorn: (in .4cncia-galls) 1. ''Eschatocerus Mayr. 



Disc of scutellum higher than mesothorax, either entirely flat, very deeply 

 wrinkled and with polished elevated margin i agamous form), or only 

 the middle with a nmnd, deeply wrinkled depression ; (in Maple-galls :) 



sexual form 2. ■Pediaspis Tischb. 



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

 handle-shaped prolongation of metathorax) deeply longitudinally fur- 

 rowed, second and tliinl 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 



