1 74 PAPERS BY DR. B. CLEMENS. 



of "frass." The larva is pale green, almost whitish, rather 

 thick and resembling 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 un- 

 successfully for another specimen. 



7. N. carycefoliella. 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 

 uniform, the anal segments pointed. 



I have taken a specimen as late as the 30th of August, 

 but at this date almost every mine found is untenanted. 



8. N. villosella. May be found in the leaves of the black- 

 berry about the middle of July. The mine is very narrow, 

 only about wide enough to accommodate the miner, tortuous, 

 with a central frass line. The larva is pale brownish and 

 leaves its mine during the latter part of July. 



This differs from N. rubifoliella (see Proc. Acad. Nat. Sc. 

 of Phila., June, 1860, p. 214) * both in the mine and colour 

 of the larva. 



9. N. Amelanchierella. Id the leaves of service-berry or 

 June-berry, Amelancliier 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 colour. 



10. N. ? prunifoliella. Mines resembling those of the 

 Nepticula, may be found in the leaves of wild cherry, Primus 



* See ante, p. 152. H. T. S. 



