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



tips of the shanks are brown. On Stachys sylvatica at the end 

 of April. 



The viviparous winged female. Is black : the abdomen is dark 

 green ; the segments have black borders : the feelers are much 

 shorter than the body : the mouth is paler towards the base : the 

 nectaries are hardly more than one-twelfth of the length of the 

 body : the legs are black ; the shanks excepting their tips are 

 yellow : the wings are colourless and very much longer than the 

 body ; the wing-ribs and the rib-veins are pale yellow ; the wing- 

 brands and the veins are pale brown ; the second vein diverges a 

 little more from the first than it does from the third ; the first 

 fork of the latter vein usually begins after one-third, and the 

 second long after two-thirds of the length of the vein ; the fourth 

 vein is moderately curved, and the angle of the vein whence it 

 springs is extremely slight. In the autumn. 



1st var. The mouth is dull green with a black tip : the nec- 

 taries are about one-sixth of the length of the body : the thighs 

 are yellow towards the base : the wing-ribs are pale green ; the 

 veins are brown. At the end of May. 



2nd var. The abdomen is very dark green : the feelers are as 

 long as the body : the mouth is dull yellow, but black towards 

 its tip : the nectaries are hardly one-sixth of the length of the 

 body : the fore-thighs are dark yellow towards the base. In the 

 middle of October. 



3rd var. The body is black : the borders and the underside of 

 the fore-chest and the abdomen are dark green : the feelers are as 

 long as the body : the mouth and the nectaries are dull yellow 

 with black tips, and the latter are as long as one-fourth of the 

 body : the thighs are pale yellow at the base : the wing-veins are 

 brown. 



Length of the body £-f line ; of the wings 2^-2| lines. 



When it feeds on the bramble it is larger and paler than when 

 it feeds on the nettle, and is much resorted to by Formica fusca. 



67. Aphis tetrarhoda } n. s. 



The viviparous wingless female. This species feeds on the rose, 

 and when full-grown is deep green, oval, very convex and plump, 

 and covered beneath with a white bloom ; it is bristly and has 

 six rows of tubercles on the back, and the middle rows are very 

 distinct : the front is hardly notched : the feelers are nearly half 

 the length of the body : the eyes are dark red : the nectaries 

 have brown tips, and are about one-eighth of the length of the 

 body : the legs are dark green, and rather long ; the feet and the 

 tips of the shanks are brown. When young it is pale grass-green, 

 slightly convex, and has a rim on each side, but its tubercles are 

 indistinct : the feelers are about half the length of the body. 



