90 William T. M. Forbes 



The food plants of N. corylifoliella include hazel (Corylus americana) , hop horn- 

 beam (Ostrya vvrginiana) , hornbeam (Carpinus carolinvna) , and black birch 

 (Betula lenta) . The mine is a long, very narrow, winding tract, scarcely broader 

 than the larva. The larvae may be found in June and early July, and from late 

 August until October. 



21. Nepticula opulifoliella Braun. Tuft ochraceous; collar usually pale yel- 

 lowish; eye-caps pale, shining buff, sometimes fuscous outwardly. Thorax dark 

 fuscous, with purple and blue reflections. Fore wings with pronounced purple 

 and blue reflections toward the costa and beyond the fascia, shading to bronzy 

 green below the fold. At three-fifths of the wing length a broad, very shiny, 

 silvery fascia with faint, golden luster. 3.5 to 4 mm. 



Ohio; North Carolina. 



The larvae form brownish, much contorted, serpentine mines in leaves of Opulaster 

 ( Physocarpus opullfolius ) . There are two generations, the larva? appearing in 

 July and September. 



This species is very close to N. corylifoliella, from which it is difficult to dis- 

 tinguish it. The pale collar, when present, is a reliable character. The more 

 yellowish eye-caps, and the less lustrous wing, with the absence of reddish tints, 

 will aid in distinguishing this species from IV. corylifoliella. 



22. Nepticula 'quercipulchella Chambers. Head black; collar and eye-caps yel- 

 lowish white, silvery; thorax and fore wings deep blue-black, bronzed, and with 

 purple and violet reflections; the fascia behind the middle, silvery white and a 

 little the widest on the dorsal margin; wing behind the fascia darker than before 

 it, but cilia paler and less lustrous than wing. Under surface of wing, abdomen, 

 and legs cupreous black. 4 mm. 



Kentucky. 



The above description is essentially that given by Chambers. According to him 

 "the larva is bright green, with a deeper green line of contents; it makes a long, 

 narrow, winding, and gradually widening track, similar to that of N. quercicasta- 

 nella Chambers in leaves of Quercus alba." Chambers asserts that the larva from 

 which he bred the type specimen formed a new mine when nearly grown, a fact, 

 if true, at variance with all observations on this group. 



23. Nepticula juglandifoliella Clemens. Tuft ochraceous, eye-caps and collar 

 shining creamy white. Thorax and fore wings deep purplish black, uniformly 

 purple beyond the fascia which is situated just beyond the middle; silvery white 

 and broadest on the dorsum. 3.5 to 3.8 mm. 



The mine is a serpentine track, usually whitish, and is found on various species 

 of hickory and on walnut and butternut. The larva is pale green (almost white 

 when feeding on walnut). 



There are three generations. Full-grown larvae may be found in the middle of 

 June, the latter part of July, and in late August and early September. 



The purple fore wings and white collar distinguish this species from its nearest 

 allies. 



24. Nepticula apicialbella Chambers. Tuft ochraceous, collar creamy white, 

 eye-caps white. Thorax dark purplish brown. Fore wings dark brown, with a 

 faint, purple luster. Beyond the middle of the wing is a narrow, oblique white 

 fascia, convex outwardly and reaching the margin farther from the base on the 

 dorsum. The scales at extreme tip of wing white, forming, with the whitish 

 apical cilia, a very distinct pale patch. 4 mm. 



Kentucky; Ohio. 



The larvae make upper-side, serpentine mines on elm. The mine is brownish in 

 color, with a conspicuous line of frass through the middle. 



There are three generations. The full-grown larvae are found in mid-June, late 

 July, and in August and September. 



The oblique fascia and white apex distinguish this species from all others. 



