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



Plate IV. 



JoiNTwoRM Flies of the Genus Harmolita. 



A, Characteristic galls of H. hordei, some clearly showing that the plants were 

 straw-fallen. About actual size; B, Larva of H. grandis form minuta in a cell 

 in the center of a wheat stem. Greatly enlarged; C, Larva of H. albomaculata 

 in a timothy stem (Phleum -pratense). Greatly enlarged; D, H. hordei touching 

 the ovipositor to barley stem, the first process in oviposirion; E, forcing the 

 ovipositor into the stem, the second step; F, the ovipositor completely down, 

 the third and last step, and the abdomen resting lightly against the stem. 

 About natural size. 



