Bui. 91, Bureau of Entomology, U. S. Dept. of Agriculture. 



Plate XXI. 



Fig. 1.— View of Laboratory Interior, Showing Cages in Use for Rearing 

 Parasites from Hibernating Webs of the Brown-Tail Moth in 1910-1911. 

 (Original.) 



Fig. 2.— "Sifting ; 



Gipsy-Moth Eggs for Examination as to Percentage of 

 Parasitism. (Original.) 



