72 THE CANADIAN ENTOMOLOGIST. 



the cuticles of the leaves of the Russian sunflower and probably of other 

 species of Heliajithus. 



The mine is large, translucent, of irregular shape, but covering an 

 area of from two to two and one half square inches. The black, granular 

 frass drops to the lower margin. The mine and included larva bear con- 

 siderable resemblance, on a magnified scale, to those of some LitJiocolletis. 

 Full-grown larva, 15 to 16 mm. long, 3.5 to 4 mm. in diameter across 

 middle segments, from which it tapers gradually toward either end. Form 

 cylindrical, with rounded segments and deep incisions, giving it a sub- 

 moniliform appearance. General colour whitish green, often with a rosy 

 suffusion. Head small, broadly triangular, polished, faintly mottled, dark 

 brown on the lobes, with dingy white, triangular face. The corneous, 

 whitish-green collar has two large, glossy, brown spots covering the greater 

 part of its surface; or, it might perhaps be better described as brown, with 

 broad, pale anterior and lateral margins and medio-dorsal line. Each of 

 the other segments has the usual arrangement of conspicuous, round, 

 dark brown, piliferous spots, from which proceed very fine, short hairs. 



The pupation is irregular. In some cases the mature larvi\j desert 

 their mines and inclose themselves in oval cocoonets on the surface of the 

 ground, but as a rule they spin up within the mine, in a nidus of loosely- 

 webbed frass, with an inner, more firmly woven cocoon immediately in- 

 closing the pupa?. The latter are short, and thick, of a golden-yellow 

 colour, without marked characteristics. 



The imago appears in eight or ten days after the larva spins up. 



The mines were discovered August 2nd, 1896, and in all probability 

 were those of a second brood. Another series of mines was found on 

 the sunflower leaves September 5th to loth, the moths from which issued 

 shortly and probably hibernated — no later mines appearing. I am in- 

 debted to my friend, Prof Fernald, for the generic determination of this 

 interesting species. 



Mailed March 4th, 1897. 



