Plate H. 



1. Sugar Maple Pink frost-gall. Eriophyessp. 4. 



2. Mountain Maple frost-gal) . Eriophyessp. 5. 



3. Rock Elm frost-gall. Eriophyessp. 6. 



Beech frost-gall. 

 Elm mite gall . 

 Elm mite gall . 

 under surface 



Eriopln/ps sp. 

 EriopJnjis ulmi . 

 Enlarged opening.on 



