KEY TO AMERICAN INSECT GALLS 51 



A transparently white, granular erineum on the leaf surface of B. p u m i 1 a. 

 Chad. '08, p. 129 



Acarid. Eriophyes sp. 

 An erineum with simple trichomes on leaf of B e t u 1 a sp. Chad. '08, p. 129 



Acarid. Eriophyes sp. 

 Alnus (alder) 

 Irregularly oval stem swelling, length 5 cm, diameter i cm. Felt and Joutel '04, 

 p. 18 



Coleop. Alder stem borer, Saperda obliqua Say 

 Subconical bud gall, diameter 6 to 12 mm. Fig. 50. Felt '156, p. 186 



Itonid. Alder bud gall, Dasyneura serrulatae O. S. 

 Small, red, pubescent, pocket gall on leaf of A. i n c a n a. PL 15, fig. i. Chad. 

 '08, p. 126 



Acarid. Eriophyes sp. 

 Small, remote, pocket gall on upper leaf surface of A. r u g o s a. Chad. '08, 

 p. 126 



Acarid. Eriophyes sp. 

 Erineum with simple trichomes on leaves of A. alnobetula. Chad. '08, p. 125 



Acarid. Eriophyes sp. 



Fig. 52. C e c i d o m y i a sp. Vein gall on 

 chestnut. (Original) 



An erineum on leaves of A. ? g 1 u t i n o s a. Chad. '08, p. 125 



Acarid. Eriophyes sp. 

 A white, frostlike erineum on the under side of the leaf in the vein axils, on A. 

 i n c a n a. Chad. '08, p. 125 



Acarid. Eriophyes sp. 

 Small, reddish or whitish, flat, woollen patches on the upper leaf surface of A. 

 i n c a n a. Chad. '08, p. 126 



Acarid. Eriophyes sp. 



Fagaceae (beech family) 

 Fagus (beech) 



Sparse, somewhat dimpled, rosy or vinose erineum on under leaf surface, on 

 F. americana. Chad. '08, p. 152 



Acarid. Eriophyes sp 



