446 
ANNUAL REPORT OF NEW-YORK 
HICKORY. LEAVES. 
their ends, though most of them at that date had become dry and 
faded to a dark brown color. The leaf is often wrinkled around 
the gall and has more or less of a fold extending from thence to 
its outer edge. The insect within, when disturbed, turns its tail 
upward over its back in a menacing manner, the same as the rove 
beetles ( Staphylinidm) do; and when the point of a needle which 
has been pressed upon one of these insects is touched to the tip 
of the tongue, unless my imagination greatly deceives me, it will 
frequently be found to impart a peculiar acrid biting sensation. 
This insect is 0.07 long, of a deep black color and highly polished. 
Its head is narrower than the thorax and nearly square. The 
third, fourth and fifth joints of the antennse are longer than the 
others, yellow and slightly transparent; the last joint is shortest 
and but half as thick as those which precede it. The abdomen 
is egg-shaped with its tip drawn out into a tube thrice as long as 
it is thick, with four long bristles at its end, and the abdomen is 
furnished with bristles at each of its sutures. The wings do not 
reach the tip of the abdomen. They are white and slightly trans¬ 
parent and fringed with black hairs. In its larva state it has a 
more slender linear form with a dull greenish yellow head, a 
white thorax with a broad black band anteriorly, a pale red 
abdomen with a black band at its tip, and whitish legs. 
16t>. Hickory leap wituereii, Phylloxera Carycefolitz, new species. (Ho- 
moptera. Aphidae.) 
Forming small conical elevations on the upper surface of the 
leaf, each having an orifice in its summit; a very small black 
plant-louse with a pale abdomen and legs and smoky wings laid 
fiat upon its back, and having only three veins in addition to the 
rib. Length 0.06. 
The protuberances formed by this plant-louse are about 0.15 
high and 0.20 broad at their bases, of a conical form and a dull 
red or lurid brown color surrounded by a light yellow' ring which 
occupies the substance of the leaf for a short distance around the 
base of each cone. The apex of the cone is fimbriated or cleft 
into a number of small teeth which turn outw'ards, and in the 
centre between the bases of these teeth is a small orifice leading 
into a cavity inside of the cone, the walls of which are scarcely 
thicker than paper, but are very tough like leather. Some leaves 
