450 Mr. F. Walker’s Descriptions of Aphides. 
on each side : the feelers are nearly as long as the body : the 
mouth is dull yellow ; its tip and the nectaries are black, and the 
latter are one-tenth of the length of the body. 
The second form of the viviparous wingless female. The winged 
mother in the beginning of June gives birth to a large progeny 
of pale green young ones ; these are covered with long white 
hairs, and have white limbs and brown eyes ; they sit in clusters 
beneath the sycamore leaves ; the number in each group varies 
from ten to some hundreds, and they continue thus without any 
increase of size for three months or longer ; they are arranged 
with their heads converging towards the centre of the group. There 
is a thin membrane or rim or edge round the body : the eyes are 
red : the mouth reaches a little beyond the hind-hips ; its tip is 
brown : the feelers are more than half the length of the body : 
the legs are rather short and stout. In September an alteration 
takes place ; the body increases in size, becomes more and more 
plump, and much less hairy, and its rim ceases : the fourth joint 
of the feelers is about half the length of the third ; the fifth is as 
long as the fourth ; the sixth is much shorter than the fifth ; the 
seventh is rather more than twice the length of the sixth. I have 
found the full-grown viviparous wingless female on the maple in 
August, but its occurrence then and during the preceding month 
is uncommon : the body is rather narrow, but rapidly increases 
in breadth towards the hinder part : the back and the limbs are 
hairy, and the feelers are nearly as long as the body ; the fourth 
joint is much shorter than the third ; the fifth is very nearly as 
long as the fourth ; the sixth is not half the length of the fifth ; 
the seventh is longer than the fifth. Both the wingless and the 
winged viviparous females in October resemble those of the pre- 
ceding generations : the forehead is slightly convex, rather bristly, 
and has no tubercles at the base of the feelers : in the winged 
insect the seventh joint of the feelers is longer than the fifth : 
the third wing-vein sometimes sends forth its second fork before 
two-thirds of its length. 
The oviparous wingless female. This appears in the autumn, 
and when very young is pale yellow j it acquires its full size 
during October, and at an early period of the growth two deep 
green spots appear on the back, and afterwards there are two 
brown stripes along the back, having a buff space between them, 
and sending forth on each side a short branch to the border of 
the abdomen which is much broader than the chest ; these stripes 
are sometimes very uneven, or broken, or various in shade and 
in tint ; the colour of the whole body is also variable, being yel- 
low, or brown, or green varied with black, or almost black : it 
contains eight large full-grown eggs which quite fill the body even 
to the fore-chest : the abdomen is lengthened or drawn out towards 
