124 LEPIDOPTERA. 



the perfect insect, and having a fine young birch in a pot, 

 just coming into leaf, I covered the pot over with muslin, 

 and turned the insects on to the plant, and the same evening 

 I observed one of the females depositing her eggs on the 

 underside of the leaves ; some leaves have as many as four 

 larvae in them" (Int. x. p. 45). 



Later in the month Mr. Wilkinson forwa;rded me some 

 nearly full-grown larvae of this species. They were whitish, 

 with the dorsal vessel green, giving the larva a very green 

 tinge; the head brown, with the liind lobes showing through 

 the front edge of the second segment ; the fifth and sixth 

 segments had slight lateral protuberances ; the hinder seg- 

 ments were very pointed. 



The mine often begins with a gallery, and then expands 

 into a large blotch. 



Micropteryx, sp. ? (Descr. Nos. 8 and 9). In May I 

 received from Mr. Healy some birch leaves, mined, as I 

 thought, by two different sorts of larv^. 



I described these as follows : — 



No. 8. Whitish, dorsal vessel greenish ; head brown, the 

 two black hind lobes showing through the second segment ; 

 no plate on second segment ; no ventral spots. 



No. 9. Whitish, almost glassy ; sides of head black, 

 mouth brownish ; the second segment with a broad sub- 

 cutaneous black plate; third segment broadest; the segments 

 deeply incised. The second, third, fourth, fifth and sixth 

 segments each with a quadrate black spot beneath, dimi- 

 nishing in size, that on the sixth segment being little more 

 than a point. 



Eventually, however, it turned out that No. 8 was only 

 the adult form of No. 9, as all the spotted larvae became in 

 time spotless. 



After these larvae were full fed they came out of the leaves, 



