Bui. 808, U. S. Dept. of Agriculture 



PLATE VI. 



JoiNTwoRM Flies of the Genus Harmolita. 



A, Characteristic galls of H. elymicola in Elymus sp., slightly reduced; B, two types 

 of injury to Agropyron sp. by H. atlantica, those to the left being sheath galls and 

 the long stems to the right being stem galls, slightly reduced; C, Typical galls of 

 the Festuca jointworm (H.festucae), about natural size; D, E, characteristic galls 

 of H. elymophthora, enlarged slightly. (Photographs D and E by Mr. C. N. Ainslie.) 



