Plate C. 



1. Spiny Witch-Hazel Gall. {Hormaphis spbiosuK.) 



2. Witch-Hazel'Cone Gall. ( Hormaphh hamarnelidis .) 



3. Cottonwood Petiole Gall. {Pemphigus popidicaiilis.) 



4. Hickory Cone Gall. (PJn/lh xera caryae-fallax.) 



5 . Cockscomb Gall on Elm . ( ( olopha ulmicoln . ) 



6. Bass wood Mite Gall. {Eriophyes abnormis.) 



[ix. ] 



