166 HICKOfeY. LEAVES— LITTLE HICKORY APHIS. 



enrVed towards the tip of the first vein; the third vein arises- from the basal extremf' 

 ty of the stigma and forward of its furcation curves perceptibly towards the apex of 

 the wing; the fourth vein is longer than the second forli. 



The LiTTiEspoTrED-wiNGED APHIS (A.mdcuiella) diiSeTs from Vary ell a in having^ 

 ffely a slender black ring at each articulation of the antennse, 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 ; fee 

 ft-st vein, apical third of tbe second vein, and the first and second forks broadly mar- 

 gihed with stnoky brown; second vfein wavy and parallel with the third Vein till near 

 fts tip where 'it curves towards the first vein, its ;ba;ae a third nearer the third than it 

 fe to the first vein ; third vein aTising from the antei^ibr extremity of the stjgma, with 

 adusky'Spfat on its apex. 



The little smokt-winqed aphis {A.fuTnipennella) is of a. dnll 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 long, equal- 

 Ung the stigma in length. 



The little blaok-maSgined aphis {A. margineila) . Pale yellow, antennsF 

 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; elytra pellucid, stigma, 

 feuter margin and rib- vein coal-black, first vein with a black dot on its base ; fourth 

 ¥ein slender, black, the other veins colorless; oute*. margin of the hind wings black. 

 Length 0.15. 



In adddtioB to the preceding a remarkably large aphis is des- 

 cribed by Dr. Harris, under the name of ^. Carym. A sptcies 

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

 probably pertains to the genus Pemphigus, and also a woolly 

 aphis (£rmoma) 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 walnus trees. 



