Plate B. 



1. Sugar Maple Pink frost-gall. EriopJii/t's sj). 4. 



2. Manitoba Majtle frost-gall. Eriophijes f-p. 5. 



3. Rock Elm frost-gall. Erioplujes sp. (i. 



Beech frost-gall . Eriophi/ei^ sj). 

 Elm mite gall. Eriophi/es iiltni . 

 Elm mite gall. Enlarged opening on 

 iin<ler surface. 



[ viii. ] 



