210 The Ohio Journal of Science [Vol. XXI, No. 6, 



The occurrence of the mine of the type specimen on another 

 species of grass {Agrostis perennans) was apparently accidental, 

 as no other mines have been found on this grass. Most of the 

 specimens reared on Glyceria are considerably larger than the 

 type, expanding 8.4 to 11 mm. 



