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. 

 Alniis (alder) 

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

 p. 18 



Coleop. Alder stem borer, Saperda obliqua Say 

 Subcorneal bud gall, diameter 6 to 12 mm. Fig. 50. Felt 'i5e, p. 186 



Itonid. Alder bud gall, Dasyneur-a serrulatae O. S. 

 Small, red, pubescent, pocket gall on leaf of A. i n c a n a. PI. 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. Cecidomyia 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 



