Mr. F. Walker’s Descriptions 0 / Aphides. 329 
the base than towards the tips, and hardly more than one-fourth 
of 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 shorter than the fifth, and the seventh than the sixth : 
the eyes are brown : the mouth is pale green with a brown tip : 
the back is adorned with rows of black spots which become more 
distinct towards the head : the nectaries do not rise above the 
surface of the abdomen : the legs are dull pale green, and rather 
short j the knees and the feet are darker. It sheds its skin in 
May, and is then paler, but as it grows it acquires a more vivid 
green colour, and has occasionally three rows of black spots along 
its back ; it now exudes more abundantly the white cottony mat- 
ter wherein it soon becomes fully wrapped ; this secretion abounds 
beneath the leaves, and being removed thence it changes into a 
solid sugar or gum sweet to the taste and melting on the tongue. 
When full-grown it is oval and fiat, and has six rows of darker 
spots along the back ; these spots are all confiuent with the ex- 
ception of the outer row on each side : the forehead is convex, 
and without spines : the feelers are rather less than half the 
length of the body ; the fourth joint is much shorter than the 
third ; the fifth is a little shorter than the fourth, and the sixth 
than the fifth ; the seventh is extremely short : the mouth extends 
to the middle of the space between the fore-hips and the middle 
hips. The body varies in shape ; sometimes it is long and nar- 
row, sometimes it is comparatively short and broad. 
The viviparous winged female. The rudimentary wings are pale 
yellow, and they are unfolded in the middle of May : the body 
is then pale green, thickly clothed with white filaments : the disc 
of the head and that of the chest are black, and the abdomen has 
a black band across each segment, and a row of black spots on 
each side : the feelers are black, slightly setaceous, and rather more 
than half the length of the body : the mouth is pale green ; its 
tip, the eyes, and the. legs are black ; the latter are moderately 
long ; the fore-thighs are pale green : the wings are colourless ; 
the wing-ribs are pale green ; the wing-brands and the veins are 
brown. It looks like a twist of cotton floating through the air, 
and its down has sometimes a delicate and beautiful azure hue. 
Length of the body I^ line ; of the wings 2^ lines. 
The oviparous wingless female. This appears in October, and 
is shining pale yellow or pale orange, which latter colour it may 
owe to the eggs which it incloses : it has also sometimes a red- 
dish tinge on each side which is adorned with a row of black dots, 
and frequently there is also a row of short black or gray bands 
along the back of the abdomen. The eggs are fastened in 
November to the twigs of the beech-tree ; when newly laid they 
are yellow, but they soon become black. 
