APPENDIX III. 



CLASSIFICATION OF THE CYNIPIDAE\ 



WITH THEIR FOOD PLANTS ^. 



GENUS. 



1. EscHATOCERus, Mayr. 



E. acaciae, Mayr (Acacia), South America. 



2. Pediaspis, Tischbein=BATHYASPis, Forster. 



P. sorbi, Tischb., agamous form of the sexual 

 B. aceris, Forst. (Acer pseudo-platanus), Europe. 



Species with alternate generations. 



3. Belenocnema, Mayr. 



B. Treatae, Mayr (Quercus virens), N. America. 



^ In the case of species with alternate generations the two names 

 under which they were formerly known are retained. The genera 

 and species are described in Prof. Mayr's monographs and in 

 Cameron's Phytophagous Flymenoptera, Ray Society. 



^ Where the food plant is Quercus robur, so far as the facts have 

 been recorded, the particular trees on which the galls grow have been 

 mentioned in the notes, but it is not to be understood that they are 

 never found on other varieties. The most common variety in England 

 is Quercus pedunculata ; it is recognized by the leaves being sessile or 

 nearly so, their upper surface being slightly polished, and by the 

 acorns having long peduncles. In Q. sessiliflora the acorns are 

 sessile ; while the leaves are on long stalks and have their upper 

 surfaces highly polished. Q.puhescens is like the latter variety, but 

 has a smaller leaf with a woolly under surface. Oaks usually begin 

 to flower when about thirty years old, but flowers are occasionally 

 found in a very dry season on much younger trees. 



