166 HICKORY. LEAVES LITTLE HICKORY APHIS. 



vein is "wavy 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. 



Tub little spotted-winged aphis (A. maculella') 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 it9 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. 



The little smoky-winged aphis (A. famipennclla) 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 stigma approaching the margin,, 

 the fourth vein, equaling the stigma in length. 



The little black-margined aphis (A. marginella). Pale yellow, an- 

 tennae white, their bases and four bands black; a coal black band in front 

 between the eyes and continued along each side of the thorax to its base; ely- 

 tra 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 the hind wings black. Length 0.1S. 



In addition to the preceding, a remarkably large aphis is des- 

 cribed by Dr. Harris, under the name of A. Carya. A species 

 which forms plaits or folds in the veins of the leaves and which 

 probably pertains to the genus Pemphigus, and also a woolly 

 aphis (Eriosoma) inhabiting this tree is known to me. These, 

 with the species which forms galls upon the leaf-stalks and twigs, 

 make nine different kinds of these vermin, which live at the ex- 

 pense of our hickory and walnut trees. 



