Mr. F. Walker's Descriptions of Aphides. 445 



forehead broad, very slightly convex, with a little tubercle on each 

 side at the base of the feelers : the eyes are dark brown and promi- 

 nent : the mouth reaches the hind-shanks : the chest and the breast 

 are dark brown ; the fore-part paler : the feelers are setaceous, more 

 than half the length of the body ; the fourth joint a little shorter 

 than the third ; the fifth a little shorter than the fourth ; the sixth 

 full half the length of the fifth ; the seventh a little shorter than 

 the fifth : the nectaries do not appear above the surface of the ab- 

 domen : the legs are tawny, long and rather stout ; the knees, the 

 feet, and the tips of the shanks are dark brown ; the shanks are 

 very slightly curved ; the fore-legs are a little shorter than the 

 hind-legs : the wings are colourless, and not very long ; the veins 

 and the wing-brands are tawny; the brands are irregularly spin- 

 dle-shaped ; the rib-veins widen gradually into the brands very 

 soon after the middle of the fore-border of the wing ; the fourth 

 vein springs from hind-border of the brand at three-fourths of 

 the length of the latter ; the third vein is distinct along its 

 whole course, and is forked a little before one-third of its length, 

 and forked again just after two-thirds of the same. 

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



Tenth Group. 

 19. Aphis Populi. 



Aphis Populi, Linn. Syst. Nat. ii. 736. 27 ; Faun. Suec. 996 ; 

 Fabr. Ent. Syst. iv. 216. 27 ; Syst. Rhyn. 298. 27 ; DeGeer. Ins. 

 iii. 94. 15. tab. 7. f. 1-7; Kalt. Mon. Pflan. i. 126. 98; Ratz. 

 Forst. Ins. iii. 218. 16. 



Myzcegirus, Amyot, Ann. Soc. Ent. Fr. 2 me serie, v. 479. 



The viviparous wingless female. It is pale yellowish green, oval, 

 and hairy : there are irregular stripes of darker green along the 

 abdomen : the feelers are pale yellow, and shorter than the body ; 

 their tips are brown : the mouth is pale yellow ; its tip is brown : 

 the eyes are dark brown : the nectaries are brown, and less than . 

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

 and moderately long; the feet and the tips of the shanks are 

 brown. It is surrounded by its offspring which are almost white, 

 and prettily mottled with green. In the middle of June 1846 

 beneath the leaves of Populus nigra, the black poplar, and P. di- 

 latata, the Lombardy poplar. 



1st variety. This is smaller than the preceding, and when 

 young is pale dull green with a bluish line on each side, oval, 

 convex, slightly pubescent : the head, a large spot on each side of 

 the fore-chest, the feelers, the mouth, the nectaries, and the legs 

 are blackish green : the feelers are less than one-third of the 

 length of the body : the eyes are dark brown : the nectaries are 



