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



stripes : the feelers and the legs are pale green ; the tips of the 

 former and the feet are brown. When the wings are unfolded 

 the insect is black : the borders and the underside of the fore- 

 chest and the abdomen are green : the feelers and the eyes are 

 black : the mouth is green with a black tip : the nectaries are 

 black, and as long as one-tenth of the body : the legs are pale 

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

 black : the wing-ribs are pale yellow, the brands are pale brown. 

 On the whitethorn in the middle of June. 



6th var. The body is dull green : the head and the disc of the 

 chest are varied with black : the feelers are brown, green at the 

 base, and shorter than the body : the wing-ribs are pale green ; 

 the veins are brown. 



7th var. While a pupa it is pale greenish yellow, with three 

 vivid green stripes on the back : the feelers are pale yellow with 

 brown tips and much shorter than the body : the mouth and the 

 nectaries are pale yellow with brown tips, and the latter are 

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

 yellow ; the feet are brown. The winged Aphis is black : the 

 abdomen is green : the feelers are rather short : the nectaries are 

 black : the legs are pale green ; the feet and the tips of the thighs 

 are black : the wing- veins are pale dull green. 



The fourth branch vein of the wing has a more gentle curve 

 than that of many species, and the angle whence it springs is 

 slight ; the third as usual is obsolete at its source, and it runs 

 nearly half its length before it sends forth its first fork, and 

 more than three-fourths of the same before it sends forth its 

 second ; the second vein diverges slightly from the third as it 

 proceeds to the hind-border; they are nearer to each other at their 

 source than the third is to the fourth ; the third converges gra- 

 dually towards the fourth from the base to the "tip ; the first and 

 second are nearer to each other at their source than are the 

 second and third, but more remote at their tips. 



Variations in the wing-veins. — 1st var. The second fork is 

 wanting. 



2nd var. Both forks are wanting. 



3rd var. Like the last, but the second and the third veins 

 meet, and after a short space part, and proceed to their re- 

 spective destinations. 



4th var. The second fork in one wing is moderately long, in 

 the other it is very short. 



The oviparous wingless female. It appears in the middle of the 

 autumn, and when very young it is pale yellow or greenish yel- 

 low : the tips of the feelers, the eyes, the tip of the mouth, and 

 the feet are dark. When a little older it is elliptical, and of a 

 soft pale velvet-like yellow hue : the feelers are black, pale yeHow 



