212 



NEW YORK STATE MUSEUM 



Subglobular, brown, spongy, apical gall, diameter 1.8 cm, possibly identical 

 with the preceding. Felt 'iij, p. 453 



Itonid. Cecidomyia sp. 



Senecio (groundsel, ragwort, squaw-weed) 



Flower heads, presumably unmodified. Felt 'isi, p. 237 



Itonid. Rhopalomyia cockerelli Felt 

 Stem gall undescribed. Felt 'iik, p. 482 



Itonid. Lasioptera arizonensis Felt 



Tetradymia spinosa (salt bush) 

 Fusiform, woolly, hollow stem enlargement, length 3 cm. diameter i cm. 

 Busck '03, p. 834 



Lepid. Gnorlmoschema ? tetrad ymiella Busck 



Arctium (burdock) 

 Yellowish larvae in burs. Felt 'iij, p. 453 



Itonid. Cecidomyia sp. 



Fig. 247. Wormwood flask 

 gall, Rhopalomyia 



ampullaria Felt. Two 

 clusters of gall, one in sec- 

 tion, the last enlarged. 

 (Original) 



Fig. 248. Diarthronomyia 

 occidentalis Felt. Gall on A. 

 tridentata, one in section, much 

 enlarged. (Original) 



Taraxacum (dandelion) 

 Oblong, irregular, polythalamous, petiole or midrib swellings, length 25 to 50 

 mm. Fig. 235, 8. Beutm. 'loa, p. 142 



Cynipid. Dandelion gall wasp. Ay lax taraxaci Ashm. 



Lactuca (lettuce) 



Irregular stem gall, diameter 1.75 cm. Felt '07a, p. 151 



Itonid. Lettuce stem midge, Lasioptera lactucae Felt 

 Rounded, elongate, irregular, polythalamous, stem swelling, length 25 to 75 mm. 

 Fig. 243. Beutm. 'lob, p. 253 



Cynipid. Lettuce tumor gall, Aulacidea tumida Bass. 

 Occurring in the pith, sometimes causing a stem swelling. Fig. 246, 1-4, pi. 3, 

 fig. 6. Beutm. 'lob, p. 254 



Cynipid. Aulacidea podagrae Bass. 

 Occurring in thin-walled cells in the pith of the stem. Fig. 246, 5. Beutm. 



'lob, p. 255 



Cynipid. Aulacidea bicolor Bass. 



