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



are colourless, and twice the length of the body ; the wing-ribs 

 are pale yellow ; the wing-brands are pale brown ; the veins are 

 brown. 



1st var. While a pupa it resembles the wingless female in 

 colour, but when the wings are unfolded it is dull green or 

 greenish yellow : the discs of the head, of the chest and of the 

 breast are black, and the abdomen has a i"ow of black dots on 

 each side : the feelers are black and as long as the body : the 

 mouth is pale yellow ; its tip and the eyes are black : the legs 

 are also pale yellow with black feet and shank- tips. 



2nd var. The body is black : the fore-border and the hind- 

 border of the fore-chest are green : the abdomen is green with 

 black cross-bands, and has a row of black spots on each side : the 

 feelers are a little longer than the body : the mouth is pale green ; 

 its tip is black : the nectaries are about one-fifth of the length 

 of the body : the legs are yellow ; the feet and the tips of the 

 thighs and of the shanks, and nearly the whole of the hind-thighs 

 are black. 



Variation in the wing-veins. The lower branch of the first fork 

 is wanting. 



The front of the head is prominent in the middle, and has a 

 tubercle on each side for the support of the feelers ; the first joint 

 of these organs is longer and narrower than the tubercle on which 

 it is seated ; the second is shorter and much narrower than the 

 first ; the third is narrower than the second ; the fourth is shorter 

 than the third ; the fifth is shorter than the fourth ; the sixth is 

 about one-third of the length of the fifth ; the seventh is longer 

 than the third : the tip of the abdomen is compressed and very 

 slightly curved. 



59. Aphis Asteris, n. s. 



The viviparous wingless female. It is oval, slightly convex, dull 

 olive-green, very much tinged with red especially round the bor- 

 der, covered with white beneath and sometimes above : it has a 

 row of impressions on each side of the body, and these are most 

 distinct towards the head : the feelers are black, yellow near the 

 base, and longer than the body : the eyes are dark red : the mouth 

 is dull yellow ; its tip is black : the nectaries are black, not curved, 

 and about one-eighth of the length of the body : the legs are long 

 and yellow ; the feet and the tips of the shanks and of the thighs 

 are black. When young it is paler and more linear, and some- 

 times green. Abundant on Aster tripolium, on the shore near 

 Lancaster and at Holywood, near Belfast, in the autumn. 



1st var. Almost black, especially towards the fore-chest and 

 the head. 



The front is slightly concave in the middle, and convex on 



