50 Mr. F.Walker's Descriptions 0/ Aphides. 



are cylindrical and about one-sixth of the length of the body : 

 the thighs are green towards the base. 



2nd var. Pale green, elliptical, convex, smooth, and shining : 

 the feelers are pale yellow : the tips of the joints are black : the 

 nectaries are about one-sixth of the length of the body ; their 

 tips are pale brown : the legs are pale yellow ; the feet and the 

 tips of the shanks are black. 



3rd var. Pale lively green, oval, not shining : the head and 

 the limbs are white, but tinged with green : the feelers are 

 shorter than the body; the tips of their joints are sometimes 

 black, as are also the tip of the mouth, the knees, the feet, and the 

 tips of the shanks. 



4th var. The body is of a fresh light gi-een colour, but not 

 shining ; it has a whitish tinge especially towards the head, and 

 is sometimes mottled with white or with pale red : the feelers are 

 pale yellow, and nearly as long as the body ; the tips of the 

 joints are black : the eyes are dark red : the mouth is pale yellow 

 with a black tip, so also are the nectaries, which are nearly one- 

 fourth of the length of the body : the legs are pale yellow ; the 

 feet and the tips of the shanks are black. 



5th var. Of a clear white colour. In the autumn on Crepis 

 tectoria. 



The viviparous winged female. Green : the head and the fore- 

 chest above are dark green : the disc of the middle chest and 

 that of the middle breast are almost black, and there are black 

 bands across the upper segments of the abdomen : the feelers 

 are black, a little longer than the body, pale yellow towards the 

 base which is dark green : the eyes are dark brown : the mouth 

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

 brown tips, and aboat one-fourth of the length of the body : 

 the legs are pale yellow, long and slender ; the feet and the 

 tips of the thighs and of the shanks are brown : the wings are 

 colourless, and about twice the length of the body ; the rib-veins 

 are pale green ; the wing-brands are pale buff; the veins are 

 brown. On the sow-thistle at the end of April. 



Wliile a pupa it is green and rather flat : the feelers are dull 

 pale green, and a little longer than the body ; the tips of the 

 joints are black : the mouth is green with a black tip : the nec- 

 taries are spindle-shaped, rather dull buff, and about one-sixth 

 of the length of the body : the legs are dull pale green ; the 

 knees and the tips of the shanks are brown. 



1st var. The limbs are blackish green. 



The wings are unfolded in May, and the Aphis is then black 

 and shining : the fore-chest is green with a black band across it : 

 the abdomen is grass-green; its disc is chiefly black: the feelers 

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



