48 



NEW YORK STATE MUSEUM 



Medium, growing in larger or smaller clusters and apparently deformations of 

 flower and leaf buds, splitting when mature into four or more broad bracts, 

 surface smooth, diameter 3 to 15 mm. Pergande '04, p. 248 



Aphid. Phylloxera devastatrix Perg. 

 Medium, smooth, growing in clusters, usually with a short, stout nipplelike 

 projection on one side, diameter 5 to 10 mm. Pergande '04, p. 249 



Aphid. Phylloxera georgiana Perg. 



Fig. 48. Cecid- Fig. 49. Spiny witch-hazel gall aphid, Hamame- 



o m y i a sp. Bud listes spinosus Shim. Pseudo galls on birch 



gall on Corylus, leaves. (After Pergande) 

 ai737- (Original) 



Large, oval, smooth, growing on the petioles, a slight, central depression covered 

 with short hairs, length 20 mm, diameter 10 mm. Pergande '04, p. 250 



Aphid . Phylloxera subelliptica Shim. 

 Globular or irregular, terminating in a toothlike nipple and occurring on tender 

 twigs, petioles or ribs of leaves, often confluent, smooth, diameter 2 to 8 mm. 

 Pergande '04, p. 251 



Aphid. Phylloxera perniciosa Perg. 

 Reniform, petiole or midrib gall, a transverse slit dividing the gall into two 

 halves, diameter 2 to 15 mm. Pergande '04, p. 257 



Aphid. Phylloxera caryaeren Ril. 



