22 



Zygobothria nidicola, adult female with details of head. A parasite of Brown-tail Moth, much enlarged. 



(Bull. 91, U.S. Dep. Agric.) 



( 5 ) As already mentioned, the Compsilura concinnata tachinid at- 

 tacks the larger caterpillars of the Brown-tail and is one of the most 

 satisfactory. 



(6) Dexodes nigripes, a tachinid, is very like Compsilura 

 concinnata in appearance. It was well colonized in 1906-07, but it has 

 not been recovered in the field to any extent. 



( 7 ) Pales favida is a promising tachinid parasite. Its eggs 

 are eaten by its host. Its life history has been worked out by Mr. W.R. 

 Thompson, a Canadian ^vorking at the Parasite Laboratory. 



Pales favida, adult female with details of head. A parasite of the Brown-tail Caterplller, much enlarged. 



(Bull. 91, U.S. Bur. Ent.) 



