184 
NORTH AMERICAN NEPTICULIDAE 
5 or 6 nun. Cocoon pale greenish brown. There are two or 
three generations a year; the larvae of the first generation become 
full grown in June. 
This is one of the most abundant species; moths may often be 
collected in great numbers in the vicinity of the food plant. 
From N. rubifoUeUa, its nearest ally, it is distinguished by the 
larger size, and ecpial breadth of fascia throughout. 
32. Nepticula slingerlandella Kearfott 
Nepticula slmgerlandeUa Kearfott, Journ, N. Y. Ent. Soc., xvi, 187, 1908; 
Slingerland, Proc. X. Y. State Fruit Growers’ Assoc., 122, 1909; Crosby, 
Bull. 308, Cornell Uiiiv. Agric. Exp. Sta., 1911; Can. Ent., .xliv, 25, 1912. 
Tuft ochraceous, becoming paler behind, where it merges into the pale 
ocherous or whitish collar. Eye-caps white. Thorax and fore wings black 
with a faint bronzy luster, somewhat irrorated beyond the shining white fascia, 
which is situated just beyond the middle of the wing. Cilia pale gray. Legs 
yellowish, shaded with fuscous, especially the posterior tibiae and tarsi. 
Expanse. — 3.5 to 5 mm. 
Localities . — New York State (Slingerland and Crosby); Ohio. 
The larvae mine leaves of cultivatetl plums and prunes, wild 
plum (Primus amencana) and occasionally sweet cherry, forming 
narrow linear mines which abruptly enlarge into irregular blotches. 
This species attains economic importance in the plum orchards 
of northern New York, where its ravages have been the subject 
of a bulletin by J\lr. C. R. C’rosby, in which further details of its 
life history, with numerous figures, are given. There is a single 
generation of moths in New Y"ork, and the larvae which are full 
grown in July do not produce moths until the following year; in 
the latitude of Cincinnati a second brood of larvae may usually 
be collected in September. 
33. Nepticula rosaefoliella Clemen.s 
Nepticula rosaefolidla Clemens, Proc. Ent. Soc. Phila., i, 85, 1861; Tin. No. 
Am., 176, 1872; Braun, Journ. Cin. Soc. N^at. xxi, 89, 1912; Dyar’s 
No. 6218. 
Tuft ochraceous; eye-caps shining creamy wliite. Fore wings almost black, 
with a very faint dark blue and bronzy luster. Just beyond the middle of the 
wing is a rather broad straight silvery or very pale golden fascia. Cilia of the 
general hue, scarcely paler tipped opposite the apex. Hind wings dark gray. 
Fore pair of legs gray, middle and hind pair silvery, hind tibiae and tarsi black 
above. Abdomen black, silvery gray beneath. 
Expanse. — 4.5 mm. 
Localities . — Pennsylvania (Clemens); Ohio. 
