Mr. F. Walker’s Descriptions of Aphides. 201 
There are two varieties of this species on the willow, and they 
differ in size; the black colour predominates in the smaller va- 
riety, and in the larger the green extends more over the body and 
over the legs. The pupze resemble the wingless insect in colour, 
but the rudimentary wings and the dise of the chest are buff. 
The oviparous wingless female. It appears at the end of Octo- 
ber, and 1s elliptical, dark velvet-like red, and rather flat: the 
feelers are white with black tips, and about one-third of the 
length of the body: the mouth is white; its tip and the eyes are 
black : the nectaries are white with black tips, and nearly one- 
fourth of the length of the body: the legs are dirty white ; the 
feet and the tips of the shanks are black; the hind-shanks are 
broad and grayish black. It continues sometimes till near the 
end of November. 
Ist var. Bright red: the dise of the abdomen is black. 
2nd var. The head is almost white. 
3rd var. Greenish yellow : the tip of the abdomen is orange : 
the legs are pale green ; the hind-shanks are dull green. 
4th var. Orange colour. 
5th var. The body is dull yellowish green, flat, oval, not 
shining: there is a broad irregular black stripe along the chest 
whereon it divides and passes along each side of the abdomen: 
the feelers are pale yellow, black towards the tips, and very nearly 
half the length of the body: the mouth is pale; its tip and the 
eyes are black : the nectaries are white, and about one-twelfth of 
the length of the body: the legs are dirty yellowish white; the 
feet and the tips of the shanks are black. 
The winged male. The body is small and black: the abdomen 
is dark brown: the feelers are black, thick from their base till 
near their tips, and nearly as long as the body: the mouth is 
yellow with a black tip ; the nectaries are black, and about one- 
sixth of the length of the body: the legs are black ; the shanks 
except their tips are yellow: the wings are colourless and much 
longer than the body ; the wmg-ribs and the rib-veins are yellow ; 
the brands and the other veins are brown. 
Ist var. The abdomen is broad, and rather dark yellow ; the 
nectaries are as long as the body : the legs are yellow; the four 
hinder thighs, excepting the base, the feet, and the tips of the 
shanks and of the fore-thighs, are black. 
2nd var. The abdomen is very dark red beneath, and covered 
with white powder: the feelers are a little longer than the body : 
the nectaries are as long as one-eighth of the body : the legs are 
black ; the thighs are pale yellow at the base; the shanks ex- 
cepting their tips are dark yellow: the wing-brands are pale 
brown. 
3rd var. The body is pale greenish yellow: the head, the disc 
