KEY TO AMERICAN INSECT GALLS 



45 



without a nipple, the orifice beneath a transverse slit, diameter 8 to 14 mm, 

 height 2 to 4 mm. Perg. '04, p. 220 



Aphid. Phylloxera caryaescissa Ril. 

 Gall subglobose, walls fleshy, somewhat more prominent above than beneath, 

 without a nipple, the orifice beneath an elongate slit, size one-half to one- 

 third the extreme diameter of P. caryaecaulis. Fig. 47, pi. 14, fig. 6. 

 Perg. '04, p. 222 



Aphid. Phylloxera caryaeglobuli Walsh 



Fig. 47. Phylloxera caryaeglobuli 

 Walsh. Croup of galls with small group enlarged 

 and showing orifice on under surface. (Original) 



Gall subglobose, walls fleshy, about equally prominent on both leaf surfaces, 

 conical beneath, ending in a short nipple and splitting into several stout bracts, 

 diameter 3 to 7 mm, height 2 to 5 mm. Perg. '04, p. 225 



Aphid. Phylloxera conica Shim. 



Gall flat above, walls fleshy, either flush with or sunken below the leaf surface, 



globular or pyriform beneath and more or less constricted at the base, with 



or without a distinct nipple which, when present, splits into several bracts, 



diameter and height 5 to 10 mm. PI. 14, fig. 4. Perg. '04, p. 228 



Aphid. Phylloxera caryae-avellana Ril. 



