Mr. F. Walker's Descriptions 0/ Aphides. 451 



the tip : the feelers are hardly half the length of the body ; the 

 fourth joint is much shorter than the third ; the fifth is a little 

 shorter than the fourth ; the sixth is more than half the length 

 of the fifth ; the seventh is a little longer than the fifth ; the fore- 

 legs are not much shorter than the hind-legs ; the hind-shanks 

 are slightly curved, tawny, and darker than the other shanks. 



The winged male. This may be found from the middle of Oc- 

 tober till November : it is like the winged female with the excep- 

 tion of the following particulars : — the abdomen is dark green, and 

 has a row of large transverse black spots along its back, and one 

 of black dots on each side : the feelers are thick till near their 

 tips : the legs are yellow ; the hind-thighs from the middle to 

 the tips, the knees, the feet, and the tips of the shanks are black. 

 The feelers are scarcely hairy, and much shorter than the body; 

 the fourth joint is much shorter than the third ; the fifth is a 

 little shorter than the fourth ; the sixth is rather more than half 

 the length of the fifth ; the seventh is as long as the fifth ; the 

 wing-brand is irregularly spindle-shaped, and gradually widens 

 soon after the middle of the wing ; the fourth vein springs from 

 a little beyond the middle of its hind border ;- the third vein is 

 obsolete for some distance from its source, it is forked at one- 

 third and forked again just after two-thirds of its length ; the 

 second vein is also obsolete before its source : the legs are hairy ; 

 their shanks are straight. 



Length of the body 1| — 2 lines ; of the wings 4 lines. 



22. Aphis Acericola, n.s. ♦ 



The viviparous winged female. Found on the sycamore at the 

 end of May and in the beginning of June. The body is black, 

 and rather long : the fore-border and the hind-border of the fore- 

 chest are green : the abdomen is grass-green, and has a row of 

 black spots on each side ; the disc of its back is black, but tra- 

 versed by narrow green bands : the nectaries are black, and about 

 one-fifteenth of the length of the body : the legs are pale yellow, 

 and moderately long ; the feet are darker : the wings are colour- 

 less, and much longer than the body ; the wing-ribs are pale 

 yellow; the wing-brands are black; the veins are black. In 

 other characters it resembles Aphis Aceris. 



Length of the body 1^ line ; of the wings 4 lines. 



Twelfth Group. 



23. Aphis Populea. 



Aphis Populea, Kaltenbach, Mon. Pflan. i. 116. 90. 

 Lachnus punctatus, Burm. Handb. Ent. ii. 93. 5. 

 The viviparous wingless female. This insect sometimes occurs 

 near London in the summer on the twigs of the Lombardy pop- 



30* 



