6l8 NEW YORK STATE MUSEUM 



Key for the separation of insect galls 



Affecting oak 

 Galls on twigs 



Delicate white, pinkish, woolly growths on twigs 



Wool sower, A n d r i c u 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. 622 



Rough, gnarled, scaly swellings on red oak limbs 



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



Irregularly rounded gall witli numerous hornlike protuberances 



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



A green or brown, club-shaped gall on tips 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, globular 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 bullet gall, H o 1 c a s p i s globulus, ]). 624 



Large uneven galls somewhat resembling a potato in shape, on white oak twigs 



Oak potato gall, Neuroterus batatus, p. 624 



An irregularly rounded gall on swamp white oak 



Noxious oak gall, Neuroterus n o x i o s u s, ]i. 624 



An oval gall composed of wedge-shaped lobes on swamp white oak 



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



Irregular reddish or greenish 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, ji. 626 

 Galls on leaves 



A nearly globular, greenish or brown gall 



Large oak apple, A m p h i b o 1 i p s c o ri f 1 u e n t u s, p. 625 



Similar to the above 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 petioles of dwarf and scrub oak 



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



Globular, smoo'.h, green galls y^ inch in diameter on red oak 



Oak leaf apple, A n d r i c u s s i n g u 1 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, p. 625 



Irregular, woody enlargements at base of the leaf 



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



