6i8 



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, Andricns se m>4 nator, p. 622 

 Woolly oak gall, Andricus operator, p. 622 

 Rough, gnarled, scaly swellings on red oak limbs 



Gouty oak gall, Andricus punctatu s, p. 623 

 Irregularly rounded gall with numerous hornlike protuberances 



Horned oak gall, Andricus corniger us, p. 624 

 A green or brown, club-shaped gall on tips of white oak twigs 



Oak tip gall, Andricus c 1 a v u 1 a, p. 624 



A rough, globular gall with conelike apex 



Rough bullet gall, Holcaspis duricoria, p. 624 

 Bulletlike galls in clusters on white oak twigs 



Oak bullet gall, Holcaspis globulus, p. 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 noxiosus, p. 624 

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



v Lobed oak gall, C y n i p s s t r o b i 1 a 11 a, p. 625 



Irregular reddish or greenish galls in clusters on white oak stems 



Oak fig gall, Biorhiza f o r t i c o r n i s, p. 626 



Galls on leaves 



A nearly globular, greenish or brown gall 



Large oak apple, Amphibolips confluentus, p. 625 

 Similar to the above but with interior nearly hollow 



Larger empty oak apple, Amphibolips i n a n i s, p. 625 

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



Black scrub oak gall, Amphibolips ilicifoliae, p. 625 

 Globular, smooth, green galls ^ inch in diameter on red oak 



Oak leaf apple, Andricus 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, Andricus 1 a n a, p. 625 

 Irregular, woody enlargements at base of the leaf 



Oak leaf-stalk gall, Andricus p e t i o 1 i c o 1 a, p. 625 



