KEY TO AMERICAN INSECT GALLS 199 



Hemispherical or subglobose, green, glabrous, cortical, stem swellings, becoming 

 brown and resembling Lecaniums, diameter 3.5 mm, height 2 mm. Fig. 226. 

 Felt 'i6f, p. 188 



Itonid. Lecanoid gall, Rhopalomyia glutinosa Felt 

 Conical stem gall, length 4 mm, diameter 3 mm. Fig. 227. Felt 'i6f, p. 187 



Itonid. Rhopalomyia chrysothamni Felt 

 Hollow, stem gall. Felt 'i5i, p. 276 



Itonid. Rhopalomyia bigeloviae Ckll. 

 Cylindrical, brown, indistinctly ridged stem gall. Height 2 mm. Diameter. 

 1.25 mm. Stands at right angles to stem. 



Itonid. Cecidomyia sp. 

 Reared from an oval, subcortical cell, length 2.5 mm, diameter i mm, showing 

 practically no enlargement. Felt '16 



Itonid. Asteromyia sp 



Bigelovia plattensis (rayless goldenrod) 



Globose, probably bud gall, diameter 5 to 6 mm. 



Itonid. Cecidomyia sp. 



Aster 

 Flower or bud galls 

 Aborted flower head of Aster patens. Osten Sacken '69, p. 299. Felt 

 'i6d, p. 127 



Itonid. Nun midge, Asphondylia monacha O. S. 

 Dwarfed or stunted flower heads of Aster paniculatus. Felt '151, 

 p. 265 



Itonid. Rhopalomyia asterifiorae Felt 

 Axillary bud gall, diameter 3-10 mm, on A s t e r 1 a t e r i f 1 o r u s . PI. 13, 

 fig. I. Felt 151, p. 247 



Itonid. Rhopalomyia lateriflori Felt 

 Ovate, axillary bud gall, length 2 to 4 mm, diameter 2 mm, on A. u n d u 1 a t u s . 

 PL 13, fig. 3 



Cecid. Rhopalomyia sp. 

 Blister leaf galls 

 Circular, yellowish white gall, diameter 2 to 3 mm, on Aster macro- 

 p h y 1 1 u s . Felt 'oge, p. 287 



Itonid. Lasioptera clarkei Felt 

 Narrowly oval, yellowish brown gall, length 4 mm, diameter 2 mm. Felt '096, 

 p. 286 



Itonid. Asteromyia dumosae Felt 

 Circular, brownish, yellow-ringed gall, diameter 3 mm. Felt 'oge, p. 286 



Itonid. Asteromyia waldorfi Felt 

 Oval, yellowish, shining gall, diameter 6 to 7 mm. Felt 'oge, p. 286 



Itonid. Asteromyia nitida Felt 

 Large, oval, pinkish blotches, diameter 10 to 12 mm, on Aster divari- 

 c a t u s . Felt 'o8e, p. 330 



Itonid. Asteromyia divaricata Felt 

 Irregularly oval, yellowish or brownish gall, diameter 6 mm, on Aster 

 paniculatus. Felt '07a, p. 109 



Itonid. Asteromyia paniculata Felt 



