40 Observations on Cynipidae. 



described. I have chosen the name from gcmmare, to 

 bud, because the galls at first resemble little buds. 



Fly. Size 2 mm. long. Female, black ; thorax dull, 

 sparsely haired ; abdomen very shining, the ventral keel 

 reddish brown ; legs orange, coxae and posterior tibiae 

 dark ; antennae orange at base, apex dark. Male, 

 black; abdomen very shining; legs somewhat paler, 

 coxae and femora dark ; base of antennae pale. They 

 emerge at the end of July and beginning of August. 



I have been unsuccessful in carrying out experi- 

 mental breeding with this generation of Andricus, on 

 account of the small number of flies I have been able 

 to collect, and I could not therefore follow directly the 

 formation of the Aphilotrix corticis gall. Besides, it is 

 very difficult to get suitable oaks for such experiments, 

 because these flies lay their eggs exclusively in tumid 

 thickenings of the bark. 



[The bud gall is found on Q. sessilijlora in May and June.] 



8. Aphilotrix globtili. Htg.^ 



Gall. This beautiful green globular gall does not 

 burst from the bud until September, and its base is then 

 closely surrounded by bud-scales. When fresh the 

 gall is covered by a sappy green rind, underneath 

 which is the woody inner gall, with a large larva 

 chamber. In October the gall falls out of the bud, the 

 sappy rind is loosened and the woody inner gall left 

 bare. But if the galls be collected when fresh, the 

 green rind dries on, and shows an uneven reticulated 

 surface, according with the description which we often 



n Cynips globuli, Htg. Andricus globuli, Mayr.] 



