Mr. F.Walker's Descriptions 0/ Aphides. 119 



the shanks are brown. In the summer it is sometimes the prey 

 of an Aphidius, and then becomes very white and globular. 



The viviparous winged female. The pupa differs as usual from 

 the wingless Aphis in structure, but not in colour : the wings 

 are unfolded in the middle of May, and at first they are milk- 

 white, while the body is bright yellow, with buff streaks on the 

 head and on the chest : it is afterwards dull yellow or pale yel- 

 low, and whitish on each side : the head and the disc of the chest 

 and that of the breast are brown : the abdomen has sometimes 

 short black bands on its back, and is covered beneath with a 

 white bloom : the feelers are black, yellow at the base, and, more 

 or less, shorter than the body ; the fourth joint is more than half 

 the length of the third ; the fifth is as long as the fourth ; the 

 sixth is a little shorter than the fifth ; the seventh is hardly 

 shorter than the sixth ; the nectaries are pale yellow, and some- 

 times spindle-shaped : the wings are colourless, the wing-ribs and 

 the rib-veins are pale yellow ; the brands are yellow or pale yel- 

 low, or brown ; the other veins are brown. 



The oviparous wingless female. It lays its eggs on the twigs at 

 the end of October, when the winged females are still bringing 

 forth young ones : it has in addition to the colours of the vivi- 

 parous wingless female usually four rows of brown or of red spots 

 on the back, and also a few small black spots, or two spots of 

 rather large size, on each side of the abdomen : the feelers are 

 brown with the base yellow, or white with brown tips, and about 

 half the length of the body : the other limbs are yellow : the tip 

 of the mouth, the eyes, the tips of the nectaries, the feet, and 

 the tips of the shanks are brown or black ; the hind-shanks are 

 also brown, and are vridened ; their dark colour and their breadth 

 are characteristic of many oviparous Aphides^ but are peculiarly 

 distinct in this species ; the nectaries are from one-sixth to one- 

 fourth of the length of the body. 



The winged male. Appears in October, and then pairs with 

 the oviparous female : it is yellow : the fore-chest except the bor- 

 der is gray : the middle chest, the middle breast, a row of short 

 bands along the back of the abdomen, the tips of the nectaries, 

 the knees, the feet, and the tips of the shanks are black : the 

 eyes are dark red. 



97. Aphis Nasturtiiy Kaltenbach. 



Aphis Nasturtii, Kalt. Mon. Pflan. i. 76. 54. 



It feeds on Nasturtium amphibium, N. officinale and N. syl- 

 vestre in the summer. 



The viviparous wingless female. The body is oval, convex, 

 green, and mottled with yellow : the feelers are brown, pale yel- 

 low at the base, and more than two-thirds of the length of the 



