6l8 NEW YORK STATE MUSEUM 



Key for the separation of insect galls 



Affi'iti/ig onk 

 Galls on twigs 



Delicate white, pinkish, woolly growths on twigs 



Wool sower, A n d r i c >i s s e m i n a t o r, p. 622 



Woolly oak gall, A n d r i c u s o p e r a t o r, p. 62 2 



Rougli, gnarled, scaly swellings on red oak limlis 



Gouty oak gall, A n d r i c 11 s ]i \i n c t a t 11 s, p. 623 



Irregularly rounded gall with numerous hornlike protuberances 



Horned oak gall, A n d r i c u s c o r n i g e r u s, p. 624 



A green or hrown, club-shaped gall on tii)s of white oak twigs 



Oak tip gall, A n d r i c u s c 1 a v u 1 a, p. 624 



A rough, globidar gall with conelike apex 



Rough bullet gall, H o 1 c a s p i s d u r i c o r i a, p. 624 



Bulletlike galls in clusters on white oak twigs 



Oak l)vdlet gall, H o 1 c a s p i s g 1 o b u 1 u s, p. 624 



Large \ineven galls somewhat resembling a jiotato in shape, on white oak twigs 



Oak potato gall, N e u r a t e r u s b a t a t u s, ji. 624 



An irregularly rounded gall on swamp -white oak 



Noxious oak gall, N e u r o t e r u s n o x i o s u s, ]>. 624 



All oval gall composed of wedge-shaped lobes on swam]) wliite oak 



Lobed oak gall, C y n i p s s t r o b i 1 a n a. |>. 625 



Irregular reddish or greenisli galls in clusters on white oak stems 



Oak fig gall, B i o r h i z a f o r t i c o r n i s, p. 626 

 GciHs on h'lTih's 



A nearly globular, greenish or Ijrown gall 



Large oak ajiple, A m p h i b o 1 i p s c o n f 1 u e n t u s, p. 025 



Similar to the aliove but with interior nearly hollow 



Larger empty oak apple, A m p h i b o 1 i p s i n a n i s, p. 625 



Elongate, fusiform galls on leaves and jietioles of dwarf and scrub oak 



Black scrub oak gall, A m p h i b o 1 i j) s i 1 i c i f (i 1 i a e, |i. 625 



Cdobular, smoolh, green galls '4 inch in diameter on red oak 



Oak leaf ap|de, A n d r i c u s s i n g u I a r i s, p. 625 



White or buff-colored woolly masses on veins of white oak leaves 



Oak wool gall, A n d r i c u s 1 a n a, |i. O25 



IrregLdar, woody enlargements at base of the leaf 



Oak leaf-stalk gall, A n <1 r i c u s p e t i o 1 i c o I a, p. 625 



