Mr. F. Walker's Descriptions of Aphides. 199 



the fourth is rather more than half the length of the third ; the 

 fifth is shorter than the fourth ; the sixth is about one-third of 

 the length of the fifth ; the seventh is nearly as long as the sixth. 



The viviparous winged female. This much resembles the wing- 

 less female in shape and colour_, and is chiefly distinguished by 

 the presence of wings and by the greater development of the 

 chest. When its wings are just unfolded they are white 

 for some little time, and then the wing-ribs, the wing-brands, 

 and the veins are pale yellow. The pupa is grass-green : the 

 winged insect is smooth, shining, and tawny : the head and the 

 lobes of the chest are brown : the feelers are black, and a little 

 longer than the body : the mouth is pale yellow with a black 

 tip : the nectaries are black, and as long as one-third of the body ; 

 the legs are black ; the thighs are yellow from the base to the 

 middle : the wings are colourless ; the wing-ribs, the rib-veins, 

 and the brands are pale yellow ; the other veins are a little darker. 



1st var. Black : the abdomen is green, paler beneath, and has 

 a row of black spots on each side of the back : the feelers are 

 much longer than the body : the nectaries are as long as one- 

 fourth of the body : the thighs are yellow towards the base. 



2nd var. The pupa is dull greenish red ; the legs are darker : 

 the rudimentary wings are pale green. 



The fore-chest is rather long, narrower in front ; its sides are 

 somewhat convex : the nectaries are tapering, but not abruptly 

 narrower towards the tips : the tip of the abdomen is compressed 

 and somewhat sickle-shaped, but not half the length of the nec- 

 taries : the legs are long ; the shanks and the second joints of the 

 feelers are slightly curved, and the former are bristly : the wings 

 are much shorter than those of A. Roscb, and together with the 

 thick heavy body will not allow of a long flight ; the brands and 

 the veins are like those of A. Rosa. During the summer and 

 autumn it darkens the stems of plants with its thick clusters, 

 and abounds especially on the knapweed, hawkweed, thistle and 

 sow-thistle. 



The winged male. Appears in the middle of September, and 

 lives through the following month : it is black : the abdomen is 

 dark green : the feelers are much longer than the body : the 

 mouth is dull yellow with a black tip : the nectaries are black, 

 and as long as one-fourth of the body : the legs are long ; the 

 base of the thighs is yellow : the wings are colourless ; the wing- 

 ribs, the rib-veins and the wing-brands are pale yellow ; the other 

 veins are yellow. 



1st var. The wing-brands and the veins are pale brown. 



47. Aphis Millefolii, Fabr. 

 Aphis Millefolii, Fabr. Sp. Ins. ii. 386. 16 ; Mant. Ins. ii. 316. 



