KEY TO AMERICAN INSECT GALLS 



135 



Flattened, white, pouch gall on leaf, the margin denticulate, length 3 to 4 mm. 

 Felt 'iij, p. 453 



Itonid. Toothed purse gall, Cecidomyia sp. 

 Oval, yellowish vein gall, length i to 1.5 cm. Fig. 136. Felt 'iik, p. 558 



Itonid. Itonida canadensis Felt 

 Leaf fold containing white larvae. Felt 'iij, p. 453 



Itonid. Cecidomyia sp. 

 A dimple similar to a phrygian cap with the tip rolled down on the upper side of 

 the leaf, rarely below. Chadwick '08, p. 126 



Acarid. Eriophyes sp. 

 Small, globose, dark brown, pocket leaf galls, singly or in clusters, on the upper 

 surface; beneath pubescent and protuberant, diameter 2 mm, on A. rotund- 

 i f o li a . Chadwick '08, p. 126 



Acarid. Eriophyes sp. 



Fig. 135- 



June berry 

 lipped gall, 

 Hormomyia 

 canaden s i s 

 Felt. Badly 

 infested leaf. 

 (Original) 



Fig. 136. Itonida canadensis Felt. 

 Upper and lower surface, the latter enlarged. 

 (Original) 



Sorbus (mountain ash) 



Rudimentary or infertile seeds. Crosby '09, p. 369 



Hym. Syntomaspis druparum Boh. 

 Rudimentary or infertile seeds. Crosby '09, p. 375 



Hym. Megastigmus brevicaudis Ratz. 

 Blister leaf gall. Parrott et al. '06, p. 298 



Acarid. Pear blister mite, Eriophyes p y r i Pgst. 

 Light brown or whitish erineum on the under surface of the leaf. Chadwick 

 '08, p. 147 



Acarid. Eriophyes sp. 



Crataegus (White thorn) 



Globose, constricted twig swellings, diameter 1.5 cm. 



Coleop. Thorn limb borer, Agrilus politus Sa}'' 



