STATE AGRICULTURAL SOCIETY. 
829 
OAK. LEAVES. 
blister-like spot on their under sides, a minute flattened pale yellow worm 
which is gradually narrowed from before backwards, 0.18 long when mature, 
surrounding itself with a thin membrane-like wall forming an oval cell in 
the center of the cavity, in which it remains during its pupa state ; produc¬ 
ing a minute snow white and silvery moth, its fore wings pale golden yel¬ 
low posteriorly, where are three black lines on the outer and two on the 
inner mirgin radiating from a common center and bordered with silvery 
white on their hind sides, and with a large black dot on the tip and 
a blackish stripe at the base ; width 0.28. 
The white blister-like spot of this leaf-miner appears on the under side 
of the leaf, with but slight, if any traces of its presence on the opposite 
side. It is broad oval and a half or three-fourths of an inch long. 
Among the fallen leaves in autumn those thus blistered may be found, 
some having the insect in its larva, others in its pupa state, 'fhe larva is 
very much flattened and tapers gradually from before backwards. It is 
divided into thirteen very distinct segments, including the head, by deeply 
impressed transverse lines. It is of a pale yellow color, with a deeper 
orange yellow band on the middle of each segment, and it also sometimes 
shows a dusky longitudinal stripe along the middle, from internal visceral 
matter. Its head is small, and its legs the same as in the preceding 
species. If ejected from its cell, it wriggles and lets itself down by a fine 
thread which it spins from its mouth. When it has finished feeding it 
stations itself in the middle of its burrow and then weaves around itself a 
curtain, from the floor to the roof, of a fine dense texture resembling the 
paper of bank bills. It thus forms a little oval cell nearly a half inch 
long and two-thirds as wide, and almost a tenth of an inch in height, the 
floor and roof being concave, as though they had been pressed outwards, 
thus making the apartment more roomy. In this cell the insect reposes 
during its pupa state, with its cast-off larva skin beside it, the black grains 
or castings of the worm and all other rubbish being outside of this in the 
burrow. The pupa is of a uniform dull orange yellow color, and of the 
same length with the larva. 
The moth appears to be closely like the European Argyromiges Clerck- 
ella , but possessing some marks not mentioned by authors as present in 
that species. Its fore wings are snow white on their anterior half, with a 
shining silvery luster, and with a blackish stripe inside of their outer edge. 
Their posterior half is of a pale golden yellow color, with a large black dot 
at the tip and three or four triangular spots on the outer and two on the 
inner margin, each spot with a black streak on its anterior edge, which 
streaks radiate from a common center. On the hind margin is a black 
band. The fringe is white, tipped with blackish on the outer half of the 
wing. The long narrow hind wings and their long fringes are silvery 
white. I have captured these moths abroad in the woods the latter part 
of May. 
