KEY TO AMERICAN INSECT GALLS 



205 



Iva (related to I. axillaris) 

 Glol)ular, pubescent, yellowish or greenish, pouch gall on the upper leaf surface, 

 length 1.5 mm. 



Acarid. E r i u ]) h y e s sp. a27i7 



Ambrosia (ragweed) 

 Prcsumal)ly from a stem gall, the latter possibly identii'al in ajjijearance with 

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



Cynipid. Ragweed stem wasp, A u 1 a c i d c a a m b r o s i a e c o 1 a 



Ashm . 



Fig. 236. Ragweed stem 

 pall, 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 affected ones leafy. Beutm. '07c, p. 388 



Itonid. Cecidomyia rudbeckiae Beutm . 



