Insect galls 



1 Phylloxera caryaecaulis Fitch rjall on hickory leaf stem 



2 Side view of same 



3 Undetermined Mack j^^alls nhmij; niitlrih of Iiickory leaf 



4 Cecidom}ia ho lot rich a ( ). S. L;alls on underside of leaf 



5 Undetermined I'hylloxera gall on hickory 



6 Appearance of same on upper surface of leaf 



7 Witch-hazel cone gall, Hormaphis hamamelidis Fitch on 



witch-hazel leaf 



8 Di pi OS is caryae O. S. gall on underside of hickory leaf 



9 C e c i d o m y i a p e r s i c o i d e s O. S. gall on underside of hickory leaf 



10 Hickory tube gall, C e c i d o m y i a t u b i c o 1 a O. S. gall on underside 



of hickory leaf 



11 Bladder maple gall, P h \- t o p t u s (juadripes Shimer galls on 



underside of soft majjle 



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



1 3 Galls of C e c i d o m )• i a v e r r u c i c o la ( ). S. on linden 



I3(r Opening of linden mile gall on underside of leaf more enlarged 



14 Linden mite gall, P h \- 1 o p t u s ahnormis Garni. 



15 Undetermined 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 ui)per side oi oak leaf 



18 Saclikc galls of Cecidomyia erubescens O. S. 



19 Hickory button gall, P h )■ 11 o x e r a f o \' e o 1 a Pcrg., on undersidv- of 



hickor\' leaf 



20 Untletermined Phylloxera galls on underside of hickory leaf 



2 I Hickory seed gall, C e c i d o m )■ i a c a r \- a e c o 1 a O. S. galls on under- 



side of hickory leaf 



3 334 ♦• 



