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



the fifth ; the seventh is much shorter than the sixth : the legs 

 are also 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 are pale yellow ; the brands and 

 the veins are brown, and the tips of the latter are slightly 

 clouded ; the second vein diverges much more from the first than 

 it does from the third ; the first fork of the latter begins a little 

 before one-third, and the second a little after two- thirds of its 

 length; the fourth vein is moderately curved, and the angle 

 whence it springs is very slight. The pupa is pale yellow, and 

 the wings when just unfolded are milk-white as usual. 



1st var. The body, the mouth and the nectaries are green : the 

 wing-ribs are pale green ; the brands are pale brown. 



2nd var. The head, the discs of the fore-chest, of the middle- 

 chest and of the middle-breast are brown, and so also are the 

 spots on the middle-chest. 



3rd var. The body is dark green. 



4th var. The abdomen is without black dots. 



5th var. The feelers are much shorter than the body. 



6th var. Some of the latter joints of the feelers are pale with 

 black tips. 



7th var. The nectaries are one-twelfth of the length of the 

 body. 



8th var. The head, the discs of the fore-chest, of the breast, of 

 the middle-chest, and a large spot on each side of the latter are 

 brown : there are some short black confluent bands that form a 

 large irregular spot on the disc of the abdomen, on each side of 

 which there is usually a row of very small black dots. 



9th var. Dark green : the head, the disc of the chest and that 

 of the breast are black : the mouth, the nectaries, the wing-ribs 

 and the wing-brands are green. 



The winged male. It appears in the autumn and is much smaller 

 than the winged female : the third joint of the feelers is rather 

 stout ; the fourth is slender, and less than half the length of the 

 third ; the fifth is a little shorter than the fourth, and the sixth 

 than the fifth ; the seventh is much shorter than the sixth. 



Length of the body f-1 line ; of the wings 2^-3 lines. 



70. Aphis Brassicce, Linn. 



Aphis Brassicce, Linn. Syst. Nat. ii. 734. 12 ; Faun. Suec. 

 2205. 985 ; Fabr. Syst. Ins. ii. 388. 36 j Ent. Syst. iv. 218. 41 ; 

 Syst. fthyn. 300. 41 ; Gmel. ed. Syst. Nat. i. 2209 j Harr. Ex. 66. 

 pi. 18. f. 3-6 j Frisch. Ins. xi. 10. t. 3. f. 15 ; Berk. Syn. i. 120; 

 Stew. El. ii. 110; Turt. ii. 207; Swammerdam, Ins. v. 535; 

 Schrank, Faun. Boic. ii. 1. 119. 1228 ; Kalt. Mon. Pflan. i. 106. 



