S() WlLMAM T. iM. FOKHKS 



aa. Fore \vinijs without pale spots or fascisc. 

 b. Ground color pale ocherous or yellowish. 



c. A purplish fuscous Itund across apex of fore wing, 

 d. Fore wing dusted with fuscous scales. 



e. A dark brown spot at base of dorsal margin 42. niyrircrticclla. 



ee. No such spot 4.3. populetorum. 



dd. Fore wing not dusted 41. cratu'gifoliella. 



cc. No such band; wing dusted. 



d. Tuft fuscous or blackish 44. saginella. 



dd. Tuft ocherous 45. pallida. 



bb. Ground color, brown with purple or bronzy luster. 

 c. Fore wing with metallic bronzy or golden reflections. 



d. Wing deep reddish or purplish bronzy 30. pomivorella. 



dd. Wing paler, with greenish golden reflections 37. chalybeia. 



cc. Fore wing dark brown, with faint purple reflections. 



d. Tarsi of middle and hind legs pale ocherous 38. flavipedella. 



dd. Tarsi of middle and hind legs whitish 39. castaneoefoliella. 



1. Nepticula argentifasciella Braun. Tuft black behind, ochraceous in front; 

 eye-caps silvery white. Thorax and base of fore wings dark purple. Fore wings 

 dark brown, with metallic reflections. At the basal fifth of the wing is a brilliant 

 silvery fascia, sometimes broadening so considerably on dorsum as almost to 

 reach the base of the wing. At the middle of the wing a second fascia; at extreme 

 apex a silvery patch of scales of variable extent. 4 to 4.5 mm. 



Larva in leaves of basswood (Tllla americana) . Mine narrow serpentine, 

 expanding into a blotch. Cocoon reddish. 



There are two or three generations a year. The larvae become full-grown 

 toward the end of June, in August, and in the latter part of September. 



2. Nepticula scintillans Braun. Tuft and collar black; eye -caps silvery white. 

 Thorax and base of fore wing golden. Fore wing, except at the base, very dark 

 purple with a silvery fascia across the middle, broadest on the dorsal margin. 

 A second silvery fascia across the apex of the wing. The cilia at the extreme 

 apex dark brown, elsewhere silvery gray. 3 mm. Ohio. Narrow serpentine mines 

 in leaves of haw apple (Crataeyns mollis) ; two generations. 



3. Nepticula pteliaeella Chambers. Tuft dark brown; eye-caps white. Thorax 

 and base of fore wing at the dorsum silvery; a silvery fascia before the middle, 

 a costal and opposite dorsal spot at three -fourths, on a dark brown ground color. 

 Cilia silvery around the apex, becoming brown toward the dorsum. Hind wings 

 dark brown. 4 to 4.5 mm. Kentucky ; Ohio. 



The larva is a miner in the leaves of the hop tree (Plelea trifoliata) ; the mine 

 (fig. 12), which is everywhere much contorted, is at first very indistinct, and some- 

 times blotch-like; later it becomes more distinct. 



There are two generations a year. The larvae may be collected in July and in 

 August and September. 



4. Nepticula quadrinotata Braun. Head dark brown; eye-caps silvery white. 

 Thorax and fore wings dark brown ; markings silvery white, consisting of an 

 elongate spot at base of dorsum, a small spot on the costa before the middle, 

 a larger triangular spot at the tornus, and a similar spot on the costa nearer 

 the apex. 4 to 5 mm. Ohio; Kentucky. 



The larva mines leaves of horn bean (Carpinus caroliniana) and hazel (Corylus 

 americana ) . The mine is at first linear, usually closely following the midrib 

 or one of the lateral veins; later doubling on itself for a short distance before 

 it expands into an irregular, pale brownish blotch. 



There are two generations a year : The larva mines in July and from late 

 August to the middle of October, but is never common. 



