june, 1860. 141 



course, and hence the deposition of the " frass" on the sides, 

 and the gradual increase in breadth as the larva grows in 

 length. Its head is blackish-brown ; the body pale greenish, 

 with pale-brown dorsal macuke, darker on their edges. It 

 undergoes transformation in the end of the mine, preparing 

 a circular cell or slightly silk-lined cavity, and leaves the 

 last larval cast outside of it. The fall brood of larvce become 

 imagos about the middle of May. 



' <fh L. cratcegella* This insect is found on the apple and 

 ^J^wild cherry {P. serotina), without undergoing any variation 

 which I can detect. I thought beyond doubt, that that in 

 the leaf of wild cherry must be a distinct species, for the 

 larva has a habit unusual to larvte of this group, and Avhich 

 I have not noticed in those on the thorn and apple, although, 

 doubtless, they correspond. The habit I refer to, in wild 

 cherry miners, consists in deserting an old mine to form a 

 neio one, — reminding one strongly of the early habits of the 

 Ornix larva?. The larva enters along the midrib to form a 

 new mine, which I have found in various stages of advance- 

 ment, besides the old and tenantless mine in another portion 

 of the leaf. 



Tisciieria. (See Paper No. 2.)f 



*to T. malifoliella. Head and antennas shining dark brown; 

 face ochreous. Fore-wings uniform, shining dark brown 

 with a purplish tinge, slightly dusted with pale ochreous ; 

 cilia of the general hue. Hind-wings dark gray ; cilia with 

 a rufous tinge. 



The larva mines the upper surface of the apple leaf. The 

 mine is flat, at least until the larva enters the pupa state, and 

 begins as a slender white line, dilating as it increases, and is 

 ultimately formed into an irregular brownish-coloured patch, 

 which is sometimes extended over the beginning. This is then 



» See ante, p. 76. II. T. S. 

 f See ante, p. 79. H. T. S. 



