446 Mr. F. Walker’s Descriptions of Aphides. 
not more than one-twentieth of the length of the body. Beneath 
the leaves of Pojmlus alba, the white poplar, a little before the 
middle of April. In the beginning of June when full-grown it 
is pale green, varied with vivid green, and is hairy, oval, and 
rather flat : the feelers are pale green, shorter than the body ; 
their tips are brown : the eyes are black : the mouth is pale green ; 
its tip is brown : the nectaries are very short : the legs are pale 
green, and moderately long ; the feet and the tips of the shanks 
are brown. 
There are often two interrupted brown lines along the back ; 
these lines vary in breadth and distinctness, and sometimes occupy 
the greater part of the back ; they occasionally occur only on the 
head and on the fore-part of the chest. The young ones have 
the front convex in the middle : the broods are less numerous in 
this species than in the kinds with long nectaries : the little ones 
before birth are of various sizes, and the smallest do not exceed 
the size of the heads of the largest. 
The oviparous wingless female. In colour it resembles the vivi- 
parous wingless female: the feelers are not more than. one-half, 
or sometimes than one-third, of the length of the body, which is 
more or less lengthened towards the tip : the hind-shanks are 
slightly dilated and of a rather darker colour than the other 
shanks : the fore-chest, like that of the male, has a dark spot on 
each side. Its eggs are three or four in number. 
The viviparous winged female. Black, and rather small : the 
fore-border, the hind-border and the underside of the fore-chest 
are dark green : the abdomen is green, and has an interrupted 
black band across the back of each segment, and a line of black 
dots along each side : the feelers are black, pale yellow towards 
the base, and shorter than the body : the eyes are black : the 
mouth is dull green : the nectaries are black, and hardly one- 
twelfth of the length of the body : the legs are pale yellow and 
moderately long ; the knees and the tips of the shanks are brown ; 
the hind-thighs are black : the wings are colourless, and much 
longer than the body ; the wing-ribs are pale yellow ; the wing- 
brands and the veins are black, and the latter are slightly 
clouded. 
] st variety. Smaller than the preceding : the abdomen and 
the underside of the fore-chest are pale green : the feelers are pale 
brown, pale green at the base, and a little shorter than the body : 
the mouth is pale green with a black tip : the legs are pale green : 
the wing-brands and the veins of the wings are brown. On 
Populus alba, the w^hite poplar, in the beginning of June. 
At the end of August it much resembles the male in colour, 
and sometimes, as in that sex, the wing-brand extends beyond 
the rib-vein which passes through it, and the zigzag line men- 
