PLATE XXI. 



Galls caused by Aphilothrix fecundatkix in leaf-biids of Q. j^edunculata. 

 The arrow indicates a gall emerging from among the leaf-scales. 

 The letters are referred to on pp. 84 and 85. 

 Four-fifths nat. size. 



Adlard <f- Son, Imjir. 



