KEY TO AMERICAN INSECT GALLS I99 



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, R h o p a 1 o m y i a g 1 u t i n o s a Felt 

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



Itonid. R h o p a 1 o m y i a c h r y s o t h a m n i Felt 

 Hollow, stem gall. Felt '151, 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. C e c i d o m y i a sp. 

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

 practically no enlargement. Felt '16 



Itonid . Asteromyiasp 



Bigclovia plattcnsis (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, A s p h o n d y 1 i a m o n a c h a O. S. 

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

 p. 265 



Itonid. Rhopalomyia asteriflorae 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 . 

 PI- 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 '096, p. 287 



Itonid. Lasioptera clarkei Felt 

 Narrowly oval, yellowish brown gall, length 4 mm, diameter 2 mm. Felt 'o9e, 

 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 '096, p. 286 



Itonid. Asteromyia n i t i d a Felt 

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

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



Itonid. Asteromyia d i v a r i c a t a Felt 

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

 paniculatus. Felt '07a, p. 109 



Itonid. Asteromyia panic u lata Felt 



