PLATE XXI II 



LEAVES OF THE ^VYCH EI.M { U hltUS glabra) \\V\y\ GAl.LS CAUSED HV 

 THE I'KESENCE OF THE LARVAE OF THE GALL-GNA'I' OUgOtrcphvs 



Leeinei. A, voung leaves much dlstori ed and swollen ; 



K, UPPER SURFACE SHEWING EXIT HOLES ; C, LOWER SURFACE wn H 

 GALLS IN A LATERAL I'OSITION ON THE MlD-lJlll 



