WILLOW LEAF-MINERS 579 
50. Gracilaria larva. 
Associated with the foregoing species and Gracilaria purpuriella, 
August 20, at Brunswick, Me. It fastens two leaves together, lining 
the cavity thus formed with white silk. It also turns a whole leaf over, 
inside out, joining the edges together completely, and making a long 
irregular pod-like tube. 
Larva. — Much like that of Gracilaria purpuriella, but the segments are fuller, with 
distinct piliferous warts which are concolorous with the body, the latter being uni- 
formly yellowish green. Head small, much narrower than the prothoracic segment, 
pale yellowish amber, with a small dark dot on each side; prothoracic segment con- 
colorous with the other segment, but with two brown dots, one on each side. Length, 
8 mm . 
51. Lithocolletis salicifoliella Clem. 
" During the latter part of June or early in July the leaves of the 
yellow willow, Salix vitellina var. alba, should be searched for this in- 
sect. The mine is on the under surface, usually near the base of the 
leaf and along the edge. I found these mines for the first time on the 
23d of July of the present year, but they were untenanted, and the 
imagos had escaped, so that I am unable to furnish any further par- 
ticulars respecting the species." (Clemens.) 
52. Lithocolletis sp. 
The larva of this tninute moth is abundant on the willow. It was 
observed July 10, and probably is to be found by the end of June. 
The leaf is folded and rolled inward from near the base to the outer 
third, and the larva eats holes in parts adjacent on the other side of 
the mid-rib and on the inside of its case. The moth emerges as early 
as July 20, leaving the pupa case sticking part way out of the folded 
leaf. July 10 we found the larva of a small Braconid ? larva which had 
spun a loose silken cocoon, closing the opening of the fold. 
Larva. — Body pale green ; head rounded, jet-black, as wide as the body. Segments 
of the body coarsely wrinkled transversely. On the three last segments of the hind 
body are black spots forming two irregular transverse conspicuous lines, and at the 
end are four black pointed tubercles or spines. Length, 6 mm . 
53. Cemiostoma albella Chambers. 
The larvsc of this Tineid are said by Chambers to live in large black- 
ish blotch mines. 
54. Aspidisca saliciella Clem. 
" From the beginning to the middle of July the larva may be* taken 
on the leaves of yellow willow. The mine is very small, the excised 
portion, with which the disk is formed, taking up the greater portion 
of it. I noticed in this larva a habit, which may be generic, but if so it 
