182 WILLIAM T. M. FORBES 



species mentioned in this work, there is an undescribed species of the light group, 

 on elm; and one of the dark group, on Hibiscus. 



Key to the species 

 1. Dominantly pale. 



2. A large, basal, blackish patch on costa 1. fulyidella. 



2. Some blackish scales near base of costa only 2. elotella. 



1. Dominantly dark. 



2. Second fascia erect, complete, as wide as the dark space before it. .4. fasciella. 

 2. Second fascia outwardly oblique, bent, and half as wide as the dark space 



before it, or broken. 

 3. First fascia twice as wide on inner margin ; the second offset its width 



at middle 7. serotinelh. 



3. First fascia even in width or broken. 



4. Brilliant, golden brown, with silver markings 9. auratclla. 



4. Dull fuscous brown, hardly shining. 



5. Ground powdery, the pale scale-bases showing; palpus with heavy 



band on third segment 5. opuntiella. 



5. Ground even, palpi with third joint pale. 

 6. Ground nearly black. 



7. Fasci* complete or nearly so. 



8. Head silver white *. 3. salictella. 



8. Head tinged with yellow 8. apocynella. 



7. Fasciae broadly interrupted 0. smilacisella, (7) pornonella. 



6. Markings edged with black, on a lighter brown ground. 



4. quinquenotella. 



1. M. fulgidella Clemens. Head and antennae yellowish white. Maxillary palpi 

 dark. Fore wing silvery white with a dark brown blotch at base, not extending 

 across the wing; a dark brown band rather below middle, sharply angulated just 

 above the inner margin, and darkest along its outer edge; outer part with two 

 broad, costal fascia? confluent in the middle of the wing, with a white costal spot 

 between them, and a white spot on inner margin opposite. Apex dark, with a white 

 costal streak before it. Hind wing dark fuscous. 7% mm. 



Larva on Qucrcus prinus; with the habits of serotinella. 

 Pennsylvania. 



2. M. elotella Busck. Paler than M. fulgidella; moth mostly white; antenna 

 yellow, darker toward the tip; palpi with black bars; tibia; mostly white. Fore 

 wing white, with yellow-brown bands edged outwardly with black; the first costal 

 spot slight and tending to break up. the two outer fascise markedly separate, diverg- 

 ing in the dorsal fringe, and followed by an apical dot. Hind wing clay color. 



Larva under bark of apple twigs, leaving a winding scar. 



South Connecticut. There is a . closely similar, possibly the same, species on 

 elm in Virginia. 



3. M. salictella Clemens. Antenna? grayish fuscous; head and palpi white; occiput 

 (as in the following species) fuscous. Maxillary palpi dark; second joint of 

 labials touched with fuscous. Fore wing dark gray-brown, with silvery-white mark- 

 ings; a fascia at basal third; and a somewhat obliqiie one at middle, slight Iv 

 excurved and sometimes broken at middle; with two costal spots and one or more 

 on inner margin beyond it; the outermost spot sometimes forming a bar across the 

 apical fringe. Fringes paler, whitish at apex; hind wing grayish fuscous, <> mm. 



June. July. 



The caterpillar forms a long, linear mine under the bark of willow twigs in the 

 fall, which at that time is inconspicuous. In the spring it is revealed by the scarring 

 of the bark over it. The larva in early spring is pale yellow; later developing 



