152 William T. M. Forbes 



4. LYONETIA Hiibner 



Vertex with bristling hair, intermediate between Prolencoptera and Bedellia, 

 and Bucculatrix. Antennse with a strongly developed eye-cap, about as long as 

 fore wings; palpi longer than eye, drooping, divergent; maxillary palpi minute; 

 tongue obsolete. Hind tibiae with long, sparse hair. Fore wing narrow-lanceolate 

 (fig. Ill), caudate, with R t arising from near middle of cell, cell narrow, without 

 accessory cell; with 4 to 6 veins arising from near its tip; 2d A strongly forked 

 at base. Hind wing linear, with Mj and M L , arising out of R, M 3 lost, and Cu simple. 



The larva normally makes a linear mine. Spuler puts Lyonetia as a separate 

 family from the preceding and following genera; but its characters do not seem 

 very important. The imago hibernates under bark. 



Key to the species 



1. Light brown with longitudinal white streak saliciella. 



1. Ground white. 



2. No distinct yellow area at apex 1. speculella. 



2. A large, orange-yellow patch at apex 2. latistrigella. 



1. L. speculella Clemens. Shining white; antennae dark brown above, more 

 or less annulate, paler below ; palpi fuscous outwardly ; hind . wings and fringe, 

 also a narrow band on hind edge of fore wings, mouse gray, bronzed with purple. 

 A brown streak from base along costal edge to beginning of fringe, typically very 

 weak; the streak then running obliquely to inner margin, enclosing a white spot 

 at inner margin. Another longitudinal bent streak in the middle of wing, meet- 

 ing the transverse part of the first; beyond this an orange-yellow spot. A black 

 apical dot. Fringe with three bars on costal side and one below, or sometimes 

 with five costal and three dorsal streaks. Typically with blackish bars at middle 

 and three-quarters way out, below fold. The type form is fully marked, but var. 

 gracilella Chambers more lightly. 7 mm. (gracilella, apieistrigella Chambers, 

 nidificansella Packard). 



The moth hibernates under bark. The larva occurs on grape, and, when com- 

 mon, on many other trees and shrubs. The mine at first is linear, with the frass 

 left in it; then it abruptly changes to a blotch, and the frass is then ejected 

 through a hole. The cocoon is slung like, a hammock on the back of a leaf. I 

 have seen a specimen of the moth suffused with gray. 



The distribution is probably general; I have seen it from Pennsylvania to British 

 Columbia. 



2. L. latistrigella Walsingham. Similar; fore wing with a fascia running from 

 middle of inner margin to three-fourths way out on costa, followed by a fer- 

 ruginous patch; without the costal streak of L. speculella; apical black dot pre- 

 ceded by white scales. 9 mm. 



Larva in soft young leaves of Rhododendron maximum ; mine at first linear, 

 3 cm. long and black, then abruptly widening but still linear for 3 cm., then a 

 brownish blotch about 5 mm. by 4 mm. Pupa naked, suspended by a few silk 

 threads to a bent leaf. 



Atlantic States (?) (locality not stated). 



L. saliciella is known definitely only from the west but is to be expected in our 

 territory ; its larva feeds on willow. 



