GALL-FLIES. 387 



tremity, and sometimes on the body, of a branch- 

 But instead of one, this has a considerable number of 

 cells, irregularly distributed through its substance. 

 The structure is somewhat spongy, but fibrous ; and 

 externally the bark is smoother than that of the branch 

 upon which it grows.* 



The cunrant-galls (as the French call them) of the 

 oak are exactly similar, when formed on the leaves, 

 to those which we have first described as produced 

 on the leaves of the willow and other trees. But the 

 name of currant-gall seems still more appropriate to 

 an excrescence which grows on the catkins of the oak, 

 giving them very much the appearance of a strag- 

 gling bunch of currants or bird-cherries. The galls 

 resemble currants which have fallen from the tree 

 before being ripe. These galls do not seem to differ 

 from those formed on the leaves of the oak ; and are 

 probably the production of the same insect, which 



Currant-Gall of the catkins of the Oat, produced by Cynipt 

 quercus pedumuti t 



J. li. 



z 2 



