92 WILLIAM T. M. FORBES 



The larva mines the leaves of various species of rose. The mine is serpentine, 

 usually much contorted, and frequently closely follows the edge of the leaf in its 

 early "course. A broad line of frass is visible. The mine at its end measures 

 1.5 to 2 mm. across. There are three generations, the larvae being full-grown 

 in June and early July, in August, and in October. Mines containing larvae may, 

 however, be found at almost any time during the summer and fall up to November. 



This species may be distinguished from A r . slingerlandella by the darker head, 

 dark cilia, and somewhat broader wings. 



30. Nepticula fuscotibiella Clemens. Tuft ochraceous; eye-caps whitish. Thorax 

 and fore wings fuscous, faintly purple, with the scales before the fascia paler 

 at their bases, so that this part of the wing is somewhat irrorated and paler than 

 that beyond the fascia where the wing is dark fuscous purple. Fascia just beyond 

 the middle, dull white, sometimes a little convex and broadening on the dorsum. 

 CiKa gray, pale gray around the apex. 4 to 4.5 mm. 



The larvae mine leaves of various species of willow. The mine is a gradually 

 broadening, linear tract, sometimes straight, but often bent back on itself toward 

 the end. Occasionally (on Sali-x discolor) its latter part is a more or less spiral 

 blotch. There are at least three generations a year. The larvae may be collected 

 from June until the end of October. 



31. Nepticula ulmella Braun. Tuft ocherous on face, tinged with red above, and 

 sometimes with a few dark brown scales behind. Anten'nae creamy white, broadly 

 banded al)ove with dark brown, so that only a narrow line of the pale color appears 

 between the annulations. Eye-caps creamy white. Thorax brownish, somewhat 

 peppered. Scales of the fore wing creamy white, shading to dark brown at their 

 tips, except where they form a creamy white, oblique fascia at the middle of the 

 wing. The general color of the fore wing is thus a somewhat mottled, dark brown. 

 Fascia, from the middle of the wing on the costa, extending to dorsum somewhat 

 behind the middle, anu sometimes broken with a few, dark-tipped scales. Cilia 

 creamy white. 4 to 5 mm. 



The larvae are miners in leaves of red elm and cork elm ( Ulmus fulva and 

 U. racemosa) . The mine starts as a very fine brown, or, rarely, whitish, line, 

 abruptly enlarging to a breadth of 1 mm., then increasing gradually in width, 

 until it attains a breadth slightly in excess of 2 mm. The broad portion of the 

 mine is usually so much contorted that it is not possible to trace the course of 

 the mine, the whole having the appearance of an irregular blotch. 



There are two generations, the mature larvaj being found in July and in 

 September. 



The creamy white fascia and cilia, together with the pale bases of the scales, 

 distinguish this species. 



32. Nepticula platanella Clemens. Tuft pale ocherous to ochraceous; eye-caps 

 silvery white. Thorax and fore wings dark brown with a bluish luster. At 

 middle of costal margin a small oblique silvery streak, and opposite it on the 

 dorsal margin is a similar streak, usually larger than the costal streak and 

 broader on the margin. Rarely both spots are very minute. Occasionally these 

 two streaks meet, forming a more or less interrupted concave fascia. Last row 

 of scales around the apex pale yellowish at their bases, thus forming a dark line 

 in the whitish cilia. Hind wings yellowish fuscous, in the male with a sword- 

 shaped, yellowish, chitinous plate on the upper side from base to near middle of 

 costa, margined along the costa with bristly black scales. Beyond this costa 

 excised. 5.5 to 7 mm. 



The mines are abundant on leaves of sycamore (Platanus occidentalis) and begin 

 as slender, linear tracks usually filled with frass. Several days before pupation, 

 the mine is abruptly enlarged into a large, usually almost circular blotch, which 

 in many instances covers the linear part of the mine. 



There are three generations of larvae, the earliest being found during June. 



