68 



MASS. EXPERIMENT STATION BULLETIN 353 



Birch Leaf Miner, Fenusa pumila 



1. Birch leaves mined by larvae. (Note the young mines starting at the center of one leaf, 

 and also the crumbled appearance of the badly mined leaves.) Actual size. 



2. Larvae. 8X. 



3. Cocoon. 4X. 



4. Cocoon opened to show prepupa inside. 4X. 



5. Prepupa. 4X. 



Figs. 2, 3, 4, and S, Courtesy, Conn. Agr. Expt. Station. 



J 



