94 Observations on Cynipidae. 



following April, but in this species also a certain 

 number of flies do not emerge until the second year. 



My. Size 3-4 mm. long ; yellowish brown ; antennae 

 black except the basal joint which is yellow below ; 

 head and thorax yellow ; on the metathorax four 

 black lines, either distinct and narrow, or broad, in 

 the latter case the two central ones blending with each 

 other ; thorax smooth, hairy at the sides ; scutellum 

 rough ; abdomen yellow, black above ; legs orange ; 

 base of the coxae dark. This fly is very like Aphilotrix 

 callidoma, but it is distinguished from it by the pale 

 scape of the antennae. 



Experimental breeding. I observed this fly for 

 the first time pricking a bud in April, 1875. I made an 

 experiment with several flies in 1876 on an oak sapling, 

 but I obtained no galls although some buds were pricked. 

 In a fresh attempt which I made on April 14, 1877, 

 I placed ten flies on a little oak ; they pricked several 

 buds, and I succeeded in getting galls. On May 10, 

 the first gall appeared on a bud, four more followed, 

 and I obtained in all five Aphilotrix albopunctata galls, 

 so that there could be no longer any doubt that 

 Aphilotrix albopunctata produces the same gall as that 

 from which it emerges. 



[The spotted bud gall appears in May on Quercus pedunculata, 

 Q. sessiliflora, and Q. pubescens. 



Inquilines, Synergus facialis, S. radiatus. 

 Parasite, Toryntus rubricipes.'] 



In the preceding pages I have sketched the life- 

 history and manner of propagation of a number of oak 



