S4 [November 



die of it. The later half of the miue will average at least a line in width. 



The larva is rather thick, bright green. One larva which I observed 

 especially mined a space oi'Jlve lines in three days, at the end of which 

 time it was full grown. Previously it was not more than half grown, and 

 the distance mined while under observation forms nearly one half the 

 length of the entire mine. The larva enters the pupa .state during the lat- 

 ter part of July. 



(5. N. J u "■ 1 a n d i f o 1 i e 1 1 a . The larva mines the leaves of Black Wal- 

 nut from the latter part of July to the middle of August. The mine is a 

 very narrow, whitish tract, very often recurved and slightly tortuous, some- 

 what, although slightly, enlarged at its end, with a very narrow central line 

 of " frass." The larva is pale green, almost whitish, rather thick and re- 

 sembling a dipteron. 



I found a single specimen on the 27th of last August, when the mines 

 appear to be usually untenanted, and very oddly, it escaped from its mine 

 as I held the leaf, whilst looking unsuccessfully for another specimen. 



7. N. CarysBfoliella. In the leaves of Hickory late in July and 

 early in August. The mine is very like the preceding, but rather wider 

 and longer and not so tortuous, but nearly always recurved and with the 

 central " frass " line. The larva is pale green, with a dark green central 

 line and brownish head. It is nearly or quite cylindrical, diameter uni- 

 form, the anal segments pointed. I have taken a specimen as late as the 

 oOth of August, but at this date almost every mine found is untenanted. 



8. N. vi Hose 11a. May be found in the leaves of the Black-berry 

 about the middle of July. The mine is very narrow only about wide en- 

 ough to accomodate the miner, tortuous, with a central frass line. The 

 larva is pale brownish and leaves its miue during the latter part of July. 



This differs from JSf. RahifolieUa (see Proc. Acad. Nat. Sc. of Phila. , 

 June, 1860, p. 214.), both in the mine and color of the larva. 



9. N. Amelanchierella. In the leaves ')f Service-berry or June-ber- 

 ry, Amelaiichirr Canadensis, in June and July. The mine rather a broad 

 tract, sometimes much contorted, with rather irregular edges, placed most 

 often towards the base of the leaf and having a rather broad '' frass " line 

 of a dark brown color. 



UK N? P runifoliella. Mines resembling those of the Nepticidi£,, 

 may be found in the leaves of wild cherry, J^ntinis Serotina, during the 

 latter part of July and early in August. It is more or less blotchy in the 

 beginning, with frass dispersed and towards the end gathered into a rath- 

 er broiid lino with the "rains distinct. I have nevci' found them teiianted 



