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vein short and often nearly abortive, shorter than the second fork, 
equally curved through its whole length, its tip much nearer that of 
the rib-vein than thatT of the second fork; rib-vein very slightly diverg¬ 
ing from the margin, from the base to the stigma, curved from thence 
to its tip. Stigma oval, about twice as long as wide, watery, some¬ 
times 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, which is dusky and black at each end. 
On the leaves of hickory. 
Aphis punctatella. Fitch. 
Callipterus punctatellus. Fitch. 
This is much like the preceding in the color of its body, antennae 
and wings, but has black feet and a black dot 01 the base and another 
on the apex of each of the veins of the fore wings; the stigma is 
salt white with a brown streak at each end; the second vein is vvavv 
and at its tip is curved towards the tip of the first vein; the third 
vein arises from the basal extremity of the stigma and forward of its 
furcation curves perceptibly towards the apex of the wing; the fourth 
vein is longer than the second fork. 
Aphis maculella. Fitch. 
Callipterus maculellus. Fitch. 
Differs from the caryella in having only a slender black ring at 
each articulation of the antennae, the feet and a band near the tips of 
the hind thighs blackish, the stigma salt white, its base black, its 
apex dusky; fourth vein with a black dot on its base and a dusky one 
on its apex; the first vein, apical third of the second vein, and the first 
and second forks broadly margined with smoky brown; second vein 
wavy and parallel with the third vein till near its tip where it curves 
towards the first vein, its base a third nearer the third than it is to 
the first vein; third vein arising from the anterior extremity of the 
stigma, with a dusky spot on its apex. 
Aphis fumipennella. Fitch. 
Callipterus fumipennellus. Fitch. 
This is of a dull yellow color with blackish feet and the wings 
smoky with robust brown veins, the rib-vein much more distant from 
the margin the first half of its length than in the other species, and 
from its middle to the stegma approaching the margin, the fourth 
vein, equaling the stigma in length. 
Aphis marginella. Fitch. 
Callipterus marginellus. Fitch 
Pale yellow, antennae white, their bases and the four bands black; 
a coal black band in front between the eyes and continued along each 
side of the thorax to its base; elilra pellucid, stigma, outer margin and 
rib-vein coal black, first vein with a black dot on its base; fourth vein 
slender, black, the other veins colorless; outer margin of hind wings 
black. 
