1903] ASHMEAD: — CYXIP01DEA 1 47 



compressed, with the second segment always large, occupying usually about 

 two thirds the whole surface of the abdomen, the hypopygium ending in a blunt 

 hairy process of variable length ; scape of antennae obconical, about thrice as 

 long as thick at apex, the third joint always distinctly longer than the fourth. 

 (Producing galls on oaks.) ...... Tribal. — Cynipini 



3. Abdomen in 9 not, or only slightly, compressed at apex, the hypopygium 

 neither prominent nor acutely pointed at apex ; scape of antennae about thrice 

 as long as thick at apex ......... 4 



Abdomen in 9 much compressed towards apex, the second segment occupying 

 about two thirds the whole surface, the hypopygium prominent, acutely pointed 

 at apex or plow-share shaped ; front wings with the areolet distinct, its base 

 directly beneath the origin of the cubitus ; scape of antennae subglobose, hardly 

 twice as long as thick. (Producing galls on rose-bushes, etc., Rosa and Eubus.) 



Tribe II. — Rhoditini 



4. Abdomen with the second segment large, occupying much more than half the 

 whole surface ; front wings with the areolet distinct, lying directly beneath the 

 origin of the cubitus ; third joint of antennae longer than the fourth. (Pro- 

 ducing galls on maple worts, Sapiiidaceae, maple, Acer.) 



Tribe III. — Pediaspidinf 

 Abdomen with the second segment shorter, occupying scarcely half the whole 

 surface ; front wings with the areolet often wanting, or if present m>^ lying 

 directly beneath the origin of the radius, usually small ; third joint of antennae 

 not or rarely longer than the fourth, usually shorter. (Producing galls on 

 RosACEAE : Rubus, Fragaria^ Potentilla ; Compositaceae : Lygodesmia, Hiera- 

 diif/i, Lactuca, Mulgidium, Souchus. Nabaliis, Taraxacum, etc. ; Papaveraceae: 

 Papaveriis, Glaiicium^ etc.) ..... Tribe IV. — Aulacini 



5. Front wings ivitJwut an areolet. 



(Producing galls on Leguminosae : Acacia?) . . Tribe V. — Eschatocerini 



Tribe I. — Cynipini. 



This is the largest and most extensive tribe in the subfamily, and contains 

 many genera and species, and all the species, without a single exception, produce 

 galls on the mastworts (Cupuliferae), the oaks (Quercus) especially being most 

 frequently subject to their attacks ; it is extremely rare for them to attack the 

 chestnut (Castanea), or the beech (Fagus) , although their galls are sometimes 

 found on these trees, but the wasps producing them are seldom reared, and are 

 still undescribed. 



