869 
No. 145. J 
most common upon the leaves of the hickory may be distinguished 
by the following characters. 
The little Hickory Aphis (Aphis Caryella ) is pale yellow with white antennae 
which are alternated with black rings, the wings transparent and without spots, 
their veins slender and pale yellow, the legs yellowish white to their ends. Length 
0.12 to the tips of the wings. The abdomen is depressed, egg-shaped, its apex 
slightly narrowed and elongated. The antenna: are longer than the body, tapering, 
seven-jointed; two basal joints as broad as long, twice the diameter of the following 
joints; third joint longest, slightly thicker towards its base; fourth and fifth joints 
rather shorter than the third, cylindric; two last joints together about equaling the 
fifth in length; the sixth swelled at its tip into a long oval knob, the seventh more 
slender but not capillary, shorter than the sixth; a broad black band at the apex of 
the third and each of the three following joints. First vein of the fore wings straight 
and almost transverse; second vein bent near its base, running first towards the apex 
and then turning rather abruptly and continuing straight to the inner margin, more 
than twice as far from the first at tip as at base; third vein arising from the stigma 
near its anterior end, and not from the rib-vein forward of the stigma, as it does in 
the aphides generally, except those pertaining to this group, its base and its apex 
about the same distance from the second vein that this is from the first, forking rather 
forward of its middle, strongly bent at this point, and from hence to its tip parallel 
with the third vein or but slightly diverging from it, its tip a third nearer that of the 
third vein than this is to the second; second fork nearer the fourth vein at tip than 
to the first fork, the triangular cell between it and the first fork with its three sides 
equal; fourth vein short and often nearly abortive, shoiter than the second fork, 
equally curved through its whole length, its tip much nearer that of the rib-vein 
than that of the second fork; rib-vein very slightly diverging from the margin from 
the base to the stigma, curved from thence to its tip. Stigma oval, about twice as 
long as wide, watery, sometimes tinged with yellowish. A variety has the stigma 
dusky at its tip. Another variety ( costalis ) has the rib-vein coal black interrupted 
with whitish towards the stigma, wltich is dusky, and black at each end. 
In addition to the species now described, four others occur 
upou the under surface of the leaves of the hickory and walnut, 
similar to it in size, form and general color, and as some of these 
are frequently met with upon the same leaves with the preceding 
they might be suspected to be mere varieties. Their spots and 
marks, however, are so clear and definite and the veins of their 
wings are so dissimilar that we are obliged to regard them as dis¬ 
tinct species. They may be named and briefly characterized as 
follows: 
The little dottkd-winoed Aenis ( A . punctatclla ) is much like the preceding 
in the color of its body, antenruc and wings, but lias black feet and a black dot on the 
base and another on the apex of each of the veins of the fore wings; the stigma is 
®alt.white with a brown streak at each end; the secon l vein is wavy and at its tip is 
