KEY TO AMERICAN INSECT GALLS 25 



Sporobolus (drop-seed, rush grass) 

 Deformed heads, Banks, '05, p. 140 



Acarid. Siteroptes carnea Banks 



Agrostis (bent grass) 



Elliptical stem swellings, length 7 to 10 mm, diameter 2 to 3 mm. Howard '95, 

 p. 12 



Hym. Grass joint-worm, Isosoma agrostidis How. 

 Ovipositing on A. alba. Felt '156, p. 135 



Itonid. Dasyneura graminis Felt 



Avena (oat) 



Reared from cage with aphid-infested seedlings, probably zoophagous. Felt 

 'o8e, p. 398 



Itonid. Coquillettomyia texana Felt 

 Reared from cage sown with oats, probably from decaying vegetable matter. 

 Felt '13m, p. 175 



Itonid. Prionellus monilis Felt 

 Reared from oats, possibly fungivorous. Felt 'Ilk, p. 550 



Itonid. Mycodiplosis spinosa Felt 



Danthonia (wild oat grass) 



Probably a stem gall. Felt '096, p. 287 



Itonid. Oat grass midge, Lasioptera danthoniae Felt 



Tridens (tall red top) 



Reared from stems. Howard '95, p. 21 



Hym. Red top borer, Eurytomocharis triodiae How. 

 Reared from seeds. Dean '10, p. 39 



Itonid. Sorghum midge, Contarinia sorghicola Coq. 



Eragrostis 



Reared from apparently normal or small, swollen stems. Howard '95, p. 21 



Hym. Red top borer, Eurytomocharis eragrostidis 



How. 

 Probably a stem gall, on E. minor. Felt 'Ilk, p. 483 



Itonid. Neolasioptera agrostis Felt 



Distichlis (spike grass) 



Fusiform stem enlargement produced by a massing of the apical or subapical 

 growth (unpublished note). Fig. 21. 



Itonid. False spike midge, PAsteromyia agrostis O. S. 

 Aborted, club-shaped shoots with rudimentary lateral leaves, length 3 to 4 cm, 

 diameter 3 to 4 mm, on D. s p i c a t a Banks, '05, p. 40 



Acarid. Siteroptes carnea Bks., a2896 

 Ovate, bract-covered gall, length 18 mm, diameter 8 mm. Mall. '18, p. 386 

 Dipt. False spike grass fly, Anthracophaga distichliae Mall. 



