828 
ANNUAL REPORT OF NEW YORK 
OAK. LEAVES. 
and half as broad. In smallish leaves this cell extends from near the mid¬ 
vein quite to the outer margin, where it is most elevated, the margin being 
often drawn together into a plait or fold as though it had been pinched 
between the fingers. Thus at this blistered spot a deep cavity is formed 
between the flat skin of the under side and the elevated fold of skin upon 
the upper side of the leaf. On this latter side the spot is white, more or 
less stained with dirty yellow and showing upon its surface a net-work of 
dirty yellow lines which are the veinlets of the leaves, made thus conspi¬ 
cuous by the parenchyma in the cells between them having been consumed. 
This dirty yellow stain renders the spot so opake that the worm inside can 
seldom be seen. This concealment is the more necessary, to enable the 
inclosed insect to elude the search of its enemies. It remains in this cell 
till near the end of its pupa state, held near the center of the cavity by a 
number of fine threads like cobwebs irregularly crossed in every direction. 
And when ready to disclose the moth, the pupa breaks through the thin 
dry skin of the uuder surface of the cell and crowds itself out till it is only 
held by its tip, when its shell cracks apart and the moth evacuates it. 
Sometimes a spider’s web may be noticed on the under side of the blistered 
leaf, placed there with the evident purpose of entrapping this pupa when it 
breaks from its cell. 
It is the latter part of summer when these blister spots begin to appear 
on the oak leaves. They occur upon the topmost leaves of the tallest 
trees as well as on those that are lower and near the ground. After the 
leaves have fallen in autumn, a portion of these blisters will be found 
empty, whilst others have pupae or sometimes larvae in them ; showing 
that the moths come out from them in autumn and also in the spring. 
The LARVA is white with a dusky or cinnamon brown stripo along its middle from internal 
alimentary matter, and the tips of its jaws are bright cinnamon brown. It is sparsely clothed 
with fine long white hairs. Its shape is analngous to that of a Buprcstis larva, the segments of 
its thorax being much broader than thoso of the abdomen, which are of equal width. It has 
three pairs of legs anteriorly and three pairs of very small prolegs placed on tho third, fourth 
and fifth narrowed abdominal rings. 
The pupa lies naked in the centre of the fine threads which the larva spins across its cell, 
without inclosing itself in a cocoon. It is at first palo yellow throughout, but the sheaths of 
its wings and legs afterwards become dusky and its head blackish. When disturbed in its 
cell it writhes or turns itself over and over, with much strength and vivacity. 
The moth is snowy white with the antenna) and feet a little dusky. Its foro wings are palo 
gdlden or shining tawny yellow, with five white streaks on tho outer margin, of which the 
first is longitudinal, placed on the margin and widened towards its hind end; tho others 
are triangular and margined on their fore sides by a black line, tho second and third ones 
being more transverse, and tho fourth or last one is directed obliquely forward and inward. Tho 
two spots on the inner margin are also edged with black on their foro sides. Tho first of theso 
spots forms with its opposite when tho wings are closed a large crescent-shaped spot across tho 
middle of the back, and the second forms a transverse diamond-shaped spot. Tho fringe is 
white with a dusky line on its base, and its outer half dusky also along tho tip. Tho hind 
wings are white or cream yellow, and their fringe silvery white. 
328. White-oak leaf-miner, Argyromiges Querci-albella, now species. 
lhating the iutoiior of White-oak leaves and hereby producing a white 
