Mr. F. Walker^s Descriptions 0 / Aphides. 449 
life by some species of Aphis : the nectaries do not rise above the 
surface of the body. In March it increases in size, sheds its 
skin, is broader than before, and of an olive-green colour, with a 
large pale green spot by each of the nectaries which are dark 
brown : there are four rows of large tubercles along the back, and 
some of smaller size intermixed : the feelers are pale green, 
darker towards their tips, or nearly brown, and not one-fourth of 
the length of the body ; the fourth joint is much shorter than the 
third ; the fifth is as long as the fourth ; the sixth is a little 
shorter than the fifth, and the seventh has the same proportion 
to the sixth : the front is convex : the mouth does not reach 
beyond the hind-hips. 
The viviparous winged female. The pupse of this generation 
appear in April, and are very variable in colour, in breadth, and 
in outline ; the colour varies between bright pale yellow with a 
slight green tinge or with two green stripes along the back, pale 
green, dark green with black spots, red, and brown ; the back 
is covered with bristles, and the underside is sometimes black : 
the feelers are more or less than half the length of the body ; 
their tips, the feet, the tips of the shanks and the hind- 
thighs are brown ; the latter are sometimes red ; the shanks are 
sometimes yellow : the nectaries are pale green with brown tips, 
and vary from one-twelfth to one-twentieth of the length of the 
body. The wings are unfolded soon after the middle of April, 
and when this process has just occurred the fly is pale green, but 
afterwards the crown of the head and the disc of the chest become 
black : the body is bristly, especially the abdomen, which has a 
black band across each segment both above and below ; the feelers 
are black or brown ; they have a broad yellow band at the base, 
and are more than half the length of the body ; the fourth joint 
is more than half the length of the third ; the fifth is a little 
shorter than the fourth ; the sixth is spindle-shaped, and hardly 
half the length of the fifth ; the seventh is much more slender 
than the sixth, and more than twice or thrice its length : the 
eyes are dark brown : the mouth and the nectaries are black : 
the legs are pale yellow and bristly ; the feet and the tips of the 
thighs and of the shanks are brown or black, which last colour 
is most prevalent in the four hinder legs whose thighs are some- 
times nearly all black : the wings are colourless, and much longer 
than the body; the wing-ribs, the wing- brands and the veins are 
bufi*, brown, green, or pale straw-colour. The colour of this insect 
for a short while after it sheds its skin is a most delicate green or 
yellow inclining to white, and resembling that of some very young 
leaves, but more beautiful. At the end of September this winged 
Aphis is black : the abdomen is dark dull yellow ; the disc of its 
back except the sutures is black, and there is a row of black dots 
Ann. ^ Mag. N. Hist. Ser. 2. Vol. i. 30 
