KEY TO AMERICAN INSECT GALLS 



205 



Iva (related to I. a x i 1 1 a r i s ) 



Globular, pubescent, yellowish or greenish, pouch gall on the upper leaf surface, 

 length 1.5 mm. 



Acarid. Eriophyes sp. aajiy 



Ambrosia (ragweed) 



Presumably from a stem gall, the latter possibly identical in appearance with 

 that of a Lepidopteron. Beutm. 'lob, p. 256 



Cynipid. Ragweed stem wasp, Aulacidea ambrosiaecola 



Ashm. 



ii'^'"^i^% 



Fig. 236. Ragweed stem 

 fall, Neolasioptera 

 ambrosiae Felt. One 

 gall in section. (Original) 



Fig. 237. Sunflower 

 stem midge, L a s i - 

 optera weldi 

 Felt. One gall partly 

 in section. (Original) 



Reared from stems of giant ragweed. Fig. 236. Felt 'oge, p. 288 



Itonid. Ragweed stem midge, Neolasioptera ambrosiae 



Felt 

 Riidbeckia (cone-flower) 



Deformed, enlarged florets, the aflfected ones leafy. Beutm. '07c, p. 388 



Itonid. Cecidomyia rudbeckiae Beutm . 



