52 Observations on Cynipidae. 



and ten out. By the beginning of July, it was possible 

 to perceive a change in some of these buds, for they were 

 noticeably thicker and larger; and by July lo, I was 

 able distinctly to recognize that it was the Aphilotrix 

 fecundatrix gall that was forming. The little oak trees 

 pierced indoors produced three, and those out of doors 

 four galls. It was in this case again remarkable how 

 few of the pricked buds produced galls. 



[The hairy catkin gall is found in May on Quercus sesstliflora7\ 



11. Aphilotrix callidonia. Htg.^ 



Gall. These, which are the most elegant of our 

 North German galls, possess a certain historical 

 interest, for they were described by Malpighi ^ in 

 1682. In spite of this it has only been in quite recent 

 times that its fly has been successfully reared. So far 

 as I know, Giraud ^, in 1859, was the first to breed and 

 describe the fly. 



The gall, which springs by a slender stalk of varying 

 length from the axil of a leaf, is spindle-shaped or 

 fusiform, and is marked by regular, sharply defined, 

 longitudinal ribs. It is usually green with ribs of a red 

 colour. (Fig. II.) 



The galls appear at different times, sometimes in 

 July, and sometimes in August. They mature quickly, 

 and the earliest fall to the ground at the end of July. 

 To rear the flies, the mature galls should be collected 



P Cynips callidotna, Thorns. Andricus cirratus, agamous form, 

 Cameron. Andricus callidotna, Mayr.] 



^ Malpighi, Plant, anatoin. II. De gallis. 



^ Signalements, &c. de Cynipides, Verhdl. zool.-bot. Ges. Wien, ix. 

 pp. 337-74- 



