44. Mr. F. Walker’s Descriptions of Aphides. 
more or less yellow, and the latter are sometimes white. It 
swarms on the young shoots, which may be easily cut off and 
removed with all their inhabitants: the leaves which it infests 
become twisted, curled, and glutinous, and are often shed. It is 
infested by an Aphidius and by an Allotria. The front is nearly 
straight with a very distinct tubercle on each side : the feelers are 
sometimes about half the length of the body ; the fourth joint is 
more than half the length of the third ; the fifth is much shorter 
than the fourth ; the sixth is much shorter than the fifth, though 
more than half its length ; the seventh is about thrice the length 
of the sixth. 
The viviparous winged female. This while a pupa is dark red : 
the feelers, the feet, and the tips of the four hinder thighs and 
of the shanks are brown; the feelers at the base and the legs 
with the above exceptions are yellow. The wings are unfolded in 
the beginning of June, and the insect is then black and shining : 
the borders of the fore-chest are dark red: the abdomen is dark 
brown : the feelers are as long as the body, and the nectaries are 
equal to one-sixth of its length : the mouth is pale yellow with a 
brown tip: the thighs towards the base and the shanks are yel- 
low: the wings are colourless, and much longer than the body ; 
the wing-ribs are pale yellow ; the wing-brands are pale brown, 
and the veins are darker ; the second vein diverges more from the 
first than it does from the third ; the first fork of the latter begins 
before or at one-third, and the second fork at or after two-thirds 
of its length; the fourth vem is much curved near its source, 
but nearly straight in the latter part of its course; the angle 
whence it springs is very slight. The wings are milk-white for 
a while after they have been unfolded, and then the other limbs 
are also white, and the body is pale reddish brown. The fore- 
legs are considerably shorter than the hind-legs ; the shanks are 
straight. 
Variation in the wing-veins. The lower branch of the second 
fork is wanting. 
The oviparous wingless female. This occurs m the middle of 
November: it is black, elliptical, and much smaller and narrower 
than the viviparous female: the feelers are rather more than half 
the length of the body ; the fifth joint is hardly shorter than the 
fourth ; the seventh is nearly twice the length of the sixth: the 
abdomen is slightly produced at the tip, and has two plates 
beneath like those of A. Tilie: the legs are rather short and 
stout ; the hind-shanks are not dilated. The glutinous matter 
which covers its body when mixed with Canada balsam acquires 
a delicate green colour. 
The winged male. This resembles the winged female, but pairs 
with the oviparous female in November. The sixth joint of the 
