GALL-FLIES. 



387 



extremity, 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 currant-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 

 straggling 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, 



Currant-Gall of the ciitkins of the Oak, produced by Cynifis 

 qij^rcus pedunoili? 



J. R. 



