Mr. F. Walker^s Descriptions 0/ Aphides. 197 



the legs are dull yellow, and rather short ; the knees, the feet, 

 and the tips of the shanks are black. 



9th var. Body pale yellowish green : the eyes are dark brown : 

 the feelers are pale green at the base, brown at the tips, and 

 rather less than one-third of the length of the body : the mouth 

 is pale green with a brown tip : the nectaries are pale green, and 

 nearly one-fifth of the length of the body : the legs are pale 

 green ; the feet are brown. 



10th var. Body dark dull yellowish green ; the head and the 

 limbs are still darker. 



11th var. Body grass-green. 



12th var. Body green, mottled with red. 



13th var. Body pale red. 



14th var. The tips of the nectaries and of the shanks are 

 brown. 



15th var. The feelers and the legs are brown. 



16th var. The body is pale whitish green : the limbs are dull 

 white or greenish white ; the former are nearly half the length of 

 the body : the eyes are dark red : the tip of the mouth is black : 

 the nectaries are as long as one-fourth of the body : the knees, 

 the feet, and the tips of the shanks are dark. 



17th var. The seventh joint of the feelers is shorter than the 

 sixth. 



The viviparous winged female. Green, and rather small : the 

 head, the disc of the chest, and that of the breast are black : 

 there is a large black spot on the back of the abdomen, and a 

 row of small black spots on each side : the feelers are black, and 

 a little longer than the body : the mouth is pale green ; its tip 

 and the eyes are black : the nectaries are dull green, and as long 

 as one-fourth of the body : the legs are pale yellow, and mode- 

 rately long ; the thighs, except the base, the feet, and the tips 

 of the shanks, are black : the wings are colourless, and much 

 longer than the body ; the wing-ribs are pale green ; the wing- 

 brands and the veins are dark brown ; the tips of the latter are 

 slightly clouded ; the second vein diverges much from the first, 

 but is nearly parallel to the third ; the situation of the forks of 

 the latter vein is variable, but the first is usually a little before 

 one-third and the second much after two-thirds of the length ; 

 the fourth vein is more curved towards its base than near its tip, 

 and the angle of the brand whence it springs is very slight. On 

 the willow in the middle of June. 



1st var. The abdomen is quite green : the thighs are gi-een 

 with black tips. 



2nd var. The abdomen is green, and there are black bands 

 across its back : the feelers are nearly as long as the bodv : the 



