Insect galls 



1 Phylloxera caryaecaulis Fitch gall on hickory leaf stem 



2 Side view of same 



3 Undetermined black galls along midrib of hickory leaf 



4 Cecidomyia ho lot rich a O. S. galls on underside of leaf 



5 Undetermined Phylloxera gall on hickory 



6 A|)i)earance of same on upper surface of leaf 



7 Witch-hazel cone gall, Hormaphis hamamelidis P'itch on 



witch-hazel leaf 



8 Diplosis caryae O. S. gall on underside of hickory leaf 



9 Cecidomyia p e r s i c o i d e s O. S. gall on underside of hickory leaf 



10 Hickory tube gall, Cecidomyia t u b i c o 1 a O. S. gall on underside 



of hickor\' leaf 



1 1 Bladder maple gall, P h y t o p t u s q u a d r i jj e s Shinier galls on 



underside of soft maple 



1 2 Spotted maple leaf galls, S c i a r a o c e 1 1 a r i s O. S. 



1 3 Galls of Cecidomyia v e r r u c i c o 1 a O. S. on linden 



lyi Opening of linden mite gall on underside of leaf more enlarged 



1 4 Linden mite gall, P h y t o p t u s a b n o r m i s Garm. 



15 I' nde-termined Phylloxera gall, probably same as shown at 5 



16 Oak pill gall, Cecidomyia pilulae Walsh galls on underside of 



oak leaf 



17 Galls of the same species on upper side of oak leaf 



1 8 Saclike galls of Cecidomyia e r u b e s c e n s O. S. 



19 Hickory button gall, Phylloxera f o v e o 1 a Perg., on underside of 



hickory leaf 



20 Undetermined Phylloxera galls on underside of hickory leaf 



2 I Hickory seed gall, Cecidomyia c a r y a e c o 1 a O. S. galls on under- 



side of hickory leaf 



