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



PLATE III. 



JoiNTWORM Flies of the Genus Harmolita. 



A, CLaracteristie manner in which U. vaginicola dwarfs wheat plants. These 

 plants rarely form grain. About one-third natural size; B, Head from a plant 

 dwarfed by //. vaginicola with the surroundins; leaf sheath removed, showing 

 the galls in the sheath and not in the stem. Slightly reduced; C, Characteristic 

 galls of //. vaginicola. Note the root like growth at "the base of galls. Slightly 

 reduced; D, Galls of H. captiva in bluegrass (Poa pratensis). There is little 

 external evidence of the galls. Note that the galls are placed end to end. Slightly 

 reduced. 



