KEY TO AMERICAN INSECT GALLS . 27 



Boring stems. Webs. & Reeves 'lo 



Hym. Western grass-stem sawfly, Cephus occidentalis 



Ril. & Marl. 



Probably inhabiting stems. Howard '95, p. 14 



Hym. Rye joint-worm, Isosoma elymi French 

 Reared from grass stems. Howard '95, p. 16 



Hym. Wheat joint- worm, Isosoma tritici Fitch 



Cyperaceae (sedges' 

 Cyperus (sedge) 

 Rathe:- cylindrical, bud or shoot galls occurring at the very base of the plant, 

 length 4 to 5 mm. Felt 'i6f, p. 176 



Itonid. Sedge bud gall, Hormomyia caudata^ Felt 



Dulichium 



Reared from fruit. Felt 'i2f, p. 241 



Itonid. Sedge fruit midge, Thecodiplosis dulichii Felt 



Lestodiplosis sp. 



Scirpus (bulrush or club rush) 



Gall undescribed. 



Itonid. Cecidomyia sp. 



Juncaceae (rushes) 



Deformed fruit 



Itonid. Rush fruit midge, Cecidomyia sp. 



Juncus (rush) 

 Infertile, deformed inflorescence, the floral organs being produced as a moderately 

 dense cluster of slender, linear bracts having a length of 3 to 4 cm. Fig. 22. 

 Patch '16, p. 21 



Hemip. Sedge Psyllid, Livia maculipennis Fitch 



Liliaceae (lily family) 



Oakesia ^ 



Yellowish bhster gall. 



Itonid. Cecidomyia sp. 

 Yucca 



Reared from pods. Felt '156, p. 140 



Itonid. Yucca pod midge, D a s y n e u r a y u c c a e Felt 

 Reared from stem, probably predaceous. Felt 'o8e, p. 408 



Itonid. Lestodiplosis yuccae Felt 



Smilacina (false Solomon's seal) 



Deformed berries. Felt 'i6d, p. 131 



Itonid. Asphondylia smilacinae Felt 

 Root gall. Bishop '11, p. 346 



Itonid. Dasyneura smilacinae Bish. 



• It is probable that a number of Hormomyias produce bud or shoot galls on various sedges. 



