Plate D. 



1. Sugar Maple Pink Frost Gall. Erlophyes sp. 



2. Manitoba Maple Frost Gall. Eriophyes sp. 



3. Rock Elm Frst Gall. Eriophyes sp. 



4. Beech Frost Gall. Eriophyes sp. 



5. Elm Mite Gall. Eriophyes ulmi. 



6. Elm Mite Gall. Enlarged opening on 



under surface. j 



[137] 



