258 Mr. F. Walker’s Descriptions of Aphides. 
in the winged insect. The young ones in the pupa or in the 
winged insect sometimes exceed thirty in number, but are then 
of various sizes ; sometimes they are of large size and only four 
in number. It is devoured by the grubs of Coccinellce, Hemerobii, 
Chrysopce and Syrphi. 
The oviparous wingless female. Appears in the autumn and 
lays its eggs during the latter part of October and in the be- 
ginning of November, when it sits on the leafless bough. It is 
brown with black bands : the feelers are black and shorter than 
the body : the mouth is dull yellow ; its tip and the nectaries are 
black : the eyes are dark red : the legs are yellowish brown : the 
hind part of the body is lengthened like that of A. Platanoidis. 
1st variety. Green. 
2nd variety. Dusky yellow, or dull reddish yellow : every seg- 
ment has a brown line across the disc, and another along each 
side border : the legs are dull yellow ; the knees are brown ; the 
feet and the tips of the shanks are black. 
The winged male. It pairs with the wingless female at the end 
of September : it is darker than the winged female, and like it is 
sometimes covered with a white bloom : the head and the chest 
are mostly black, and there is a compact row of large black spots 
along the abdomen : the feelers are longer than the body : the 
mouth is short, and reaches a little beyond the hind-border of 
the fore-chest. 
Length of the body If — 2J lines ; of the wings 4 — 5^ lines. 
4. Aphis comes. 
This insect is of rare occurrence, and has much resemblance to 
Aphis Betulce. 
The viviparous winged female. Found on the birch, Betula 
alba, in August and in October. The body is yellowish brown, 
and rather long : the front of the head is rather narrow and 
nearly straight, and there is a slight protuberance at the inner 
base of each feeler : the feelers are black, setaceous, slightly 
hairy, and much shorter than the body ; the first and the second 
joints are yellowish ; the fourth is much shorter than the third ; 
the fifth is much shorter than the fourth ; the sixth is not half the 
length of the fifth ; the seventh is a little shorter than the sixth : 
the mouth is yellow, and reaches to the middle hips ; its tip is 
black : the eyes are dark red : the disc of the chest and that of 
the breast are black : the abdomen has two black spots on each 
side : the nectaries are extremely short, and like those of A. Be- 
tulce : the legs are brownish yellow, long, and somewhat hairy ; 
the feet, the knees, and the tips of the shanks of the fore-legs and 
of the middle legs, and the whole of the hind legs excepting the 
base of the thighs, arc black : thcAvings arc colourless; the wing- 
