445 
Mr. F. Walker’s Descriptions of Aphides. 
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 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. 
hi. 94. 15. tab. 7. f. 1-7 ; Kalt. Mon. Pflan. i. 126. 98; Ratz. 
Forst. Ins. hi. 218. 16. 
Myzeegirus, Amyot, Ann. Soc. Ent. Fr. 2“® 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 
