26 THE CANADIAN ENTOMOLOGIST. 
almost overspread with blackish-brown scales on the white ground, pro- 
duced along the costa towards, but not to, the base; the second is shorter, 
wider, suffused with ochreous and blackish; not distinct, and sometimes only 
distinguishable as a paler spot in the blackish portion of the wing, produced. 
along tne costa to the first streak ; the third is larger, distinct, curving 
backwards to the centre of the apical part of the wing, and gradually 
narrowing ; it forms the posterior margin of the blackish portion of the wing, 
which curves around it, narrowing to a point in the centre of the apical part 
of the wing. Apical part of the wing, as far as the third costal streak, 
brownish-ochreous, with an indistinct brown apical spot. Fourth and 
fifth costal streaks in the brownish-ochreous part of the wing. Ciliae 
silvery-gray, with two brownish hinder marginal lines, one at the base ; the 
other near the apex, and continued into the “ hook.” Alar ex. se inch. 
This species resembles the European G. Ao//ariella, as figured in 
Stainton’s Var. His. Tin., v. 8, p. 128, and plate 3, fig. 3, but probably is 
nearer still to G. Gradatella, and may prove to be that species, the food- 
plant of which is unknown. ‘The principal differences between it and 
Kollariella, are indicated by the italics. 
The larva was not observed until August, and some of the mines were! 
then empty. I found it abundant from that time until the fall of the leaves 
in November. It mines the upper surface of the leaves of different 
Willows (Salix longifolia, native, and S. alba and S. Babylonica, foreign 
species). It does not leave one mine to form another, but continues in 
one mine until ready to become a pupa ; and sometimes the mine covers 
nearly the entire leaf. It pupates under a dense semi-transparent white 
web over the midrib ; usually of a different leaf, though I have occasion- 
ally found it on the under side of the same leaf mined by it. It remains 
in the pupa state about two weeks, and the imago probably hybernates. 
Common in Kentucky. 
7. Gracillaria desmodifoliella, Clem. Proc. Enr. Soc. 1865, p. T45; pre- 
viously described by Dr. Clemens in Proc. Acad. Wat. Sci., Phila., 1860, 
p. 7, as G. violacella. The last description was made ‘to correct the 
first, but from a single bred specimen in my possession, the first descrip- 
tion seems to be as nearly correct as the last. Probably it is a somewhat 
variable species. It feeds on the leaves of species of Desmodium, and 
if it is ever a miner (as it most probably is), it is so for a very short time 
only, as the larvae are found, whilst still very small, rolling the leaves from 
the apex downwards, eating the underside. It frequently leaves one roll 
