Mr. F. Walker's Descriptions 0/ Aphides. 51 



a black tip : the nectaries are green, spindle-shaped, and about 

 one-sixth of the length of the body ; their tips are black : the 

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

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

 than the body; the wing-ribs and the wing-brands are pale 

 green ; the veins are brown. 



1st var. The mouth is pale yellow with a black tip : the nec- 

 taries are cylindrical ; their tips are brown : the feet and the tips 

 of the thighs and of the shanks are also brown. 



2nd var. The abdomen is green, and has a row of transverse 

 black spots along the middle of the back, and a row of black dots 

 on each side : the feelers are nearly as long as the body : the nec- 

 taries are black : the wing-ribs are pale yellow ; the wing-brands 

 are dull buff. 



3rd var. The legs are green ; the thighs except the base and 

 the feet are black : the wing-brands are pale brown. 



4th var. Green : the lobes of the chest are brown, and the 

 breast is pale gray : there is a vivid green stripe along the mid- 

 dle of the abdomen, which is whitish beneath : the feelers are pale 

 green towards the base : the eyes are darkred : the thighs are 

 pale green ; the shanks are dull yellow ; their tips and the feet are 

 black : the wing-ribs, the rib-veins, and the wing-brands are pale 

 yellow ; the other veins are pale brown. In the autumn. 



5th var. The nectaries are pale yellow, and rather more than 

 one-fifth of the length of the body. 



6th var. Black : the borders of the fore-chest, the fore-breast, 

 and the abdomen are greenish yellow; the back of the latter is 

 varied with black : the nectaries are dark yellow, black towards 

 the base and at the tips, and rather more than one-sixth of the 

 length of the body : the thighs are pale yellow from the base to 

 the middle, and black from thence to the tips ; the shanks are 

 dark yellow, their tips and the feet are black : the wing-brands 

 are brown. 



It acquires wings on the lettuce at the end of May. Fourth 

 generation ? 



7th var. Pupa. Limbs blackish green. 



8th var. Pupa. Pale yellow ; the feelers are as long as the 

 body ; the tips of the joints and the whole of the latter joints are 

 brown : the tips of the mouth, the tips of the nectaries, the feet, 

 and the tips of the shanks are also brown. On the sow-thistle. 



9th var. Black : the fore-chest is dark green ; its fore-border 

 and its hind-border are light green : the abdomen is green, and 

 has a large black spot near the tip of the back, and a row of 

 black dots on each side : the nectaries are pale yellow with brown 

 tips : the legs are pale yellow ; the feet and the tips of the thighs 

 and of the shanks are black ; the wing-brands are pale brown. 



4* 



