Mr. F. Walker's Descriptions of Aphides. 389 



twice the length of the sixth : the eyes are dark red or black : 

 the mouth is green or pale green ; its tip and the nectaries are 

 black, the latter are about one-twelfth or one-twentieth of the 

 length of the body : the legs are pale green ; the feet and the 

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

 white or colourless and much longer than the body ; the wing- 

 ribs, the rib-veins and the wing-brands are pale green, the latter 

 are sometimes pale brown ; the other veins are brown ; the first 

 vein is more perpendicular than is usual in this group, and the 

 second vein diverges much more from it than it does from the 

 third ; the first fork of the latter vein is a little after one-third 

 and the second much more after two-thirds of its length ; the 

 fourth vein is curved moderately and equally throughout its 

 length, and the angle whence it springs is very slight. 



1st var. The legs are white ; the feet and the tips of the shanks 

 are brown. 



The oviparous wingless female. The body is small, slender, 

 nearly linear, rather flat, smooth, whitish green tinged with 

 yellow, not shining : there is a dark green stripe along the back : 

 the head is yellow : the feelers are black, pale yellow at the base 

 and about half the length of the body : the eyes are dark red : 

 the mouth and the nectaries are pale yellow with black tips, and 

 the latter are hardly one-tenth of the length of the body : the 

 legs are pale yellow and rather short ; the knees, the feet and the 

 tips of the shanks are black. On Elymus or Calamagrostis are- 

 narius. 



1st var. The body is green : the eyes are nearly black. 



2nd var. The back of the body has a bluish tinge. On Salsola 

 Kali in the beginning of October near Fleetwood. 



The wingless male. Like the oviparous female, but smaller : 

 the feelers are about half the length of the body. 



Length of the body |~ j line ; of the wings 2£ lines. 



83. Aphis Lythri, Schrank. 



Aphis Lythri, Schrank, Faun. Boic. ii. 1. 115. 1215; Kalt. 

 Mon. Pflan. i. 5 1 . 36. 



LythraphiSy Amyot, Ann. Soc. Ent. Fr. 2 de serie, v. 477. 



The viviparous wingless female. This insect feeds on Ly thrum 

 Salicaria in the summer. It is small, pale green, oval, shining, 

 and slightly convex : the feelers are pale yellow, and shorter than 

 the body, their tips and the eyes are black : the mouth and the 

 nectaries are also pale yellow with black tips, and the latter are 

 as long as one-fourth of the body : the legs are pale yellow, and 

 moderately long ; the feet are darker. While young it is nar- 

 rower and more linear. The front has three small tubercles ; the 

 first and the second joints of the feelers are not angular; the 

 fourth is much shorter than the third ; the fifth is a little shorter 



