Mr. F. Walker's Descriptions of Aphides. 449 



life by some species of Aphis : the nectaries do not rise above the 

 surface of the body. In March it increases in size, sheds its 

 skin, is broader than before, and of an olive-green colour, with a 

 large pale green spot by each of the nectaries which are dark 

 brown : there are four rows of large tubercles along the back, and 

 some of smaller size intermixed : the feelers are pale green, 

 darker towards their tips, or nearly brown, and not one-fourth of 

 the length of the body ; the fourth joint is much shorter than the 

 third ; the fifth is as long as the fourth ; the sixth is a little 

 shorter than the fifth, and the seventh has the same proportion 

 to the sixth : the front is convex : the mouth does not reach 

 beyond the hind-hips. 



The viviparous winged female. The pupae of this generation 

 appear in April, and are very variable in colour, in breadth, and 

 in outline ; the colour varies between bright pale yellow with a 

 slight green tinge or with two green stripes along the back, pale 

 green, dark green with black spots, red, and brown ; the back 

 is covered with bristles, and the underside is sometimes black : 

 the feelers are more or less than half the length of the body ; 

 their tips, the feet, the tips of the shanks and the hind- 

 thighs are brown ; the latter are sometimes red ; the shanks are 

 sometimes yellow : the nectaries are pale green with brown tips, 

 and vary from one-twelfth to one-twentieth of the length of the 

 body. The wings are unfolded soon after the middle of April, 

 and when this process has just occurred the fly is pale green, but 

 afterwards the crown of the head and the disc of the chest become 

 black : the body is bristly, especially the abdomen, which has a 

 black band across each segment both above and below ; the feelers 

 are black or brown ; they have a broad yellow band at the base, 

 and are more than half the length of the body ; the fourth joint 

 is more than half the length of the third ; the fifth is a little 

 shorter than the fourth ; the sixth is spindle-shaped, and hardly 

 half the length of the fifth ; the seventh is much more slender 

 than the sixth, and more than twice or thrice its length : the 

 eyes are dark brown : the mouth and the nectaries are black : 

 the legs are pale yellow and bristly ; the feet and the tips of the 

 thighs and of the shanks are brown or black, which last colour 

 is most prevalent in the four hinder legs whose thighs are some- 

 times nearly all black : the wings are colourless, and much longer 

 than the body; the wing-ribs, the wing- brands and the veins are 

 buff, brown, green, or pale straw-colour. The colour of this insect 

 for a short while after it sheds its skin is a most delicate green or 

 yellow inclining to white, and resembling that of some very young 

 leaves, but more beautiful. At the end of September this winged 

 Aphis is black : the abdomen is dark dull yellow; the disc of its 

 back except the sutures is black, and there is a row of black d o 



Ann. $ Mag. N. Hist. Ser. 2. Vol. i. 30 



