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



3rd var. The body is bronze black. 



4th var. The body is shining. 



5th var. The body is covered with a white bloom. 



6th var. There are two stripes of white powder on the back. 



7th var. The feelers and the mouth are black, dull white 

 towards the base. 



8th var. The feelers are nearly as long as the body. 



9th var. The nectaries are as long as one-sixth of the body. 



10th var. The nectaries are as long as one-twelfth of the 

 body. 



11th var. The tips only of the hind-thighs are black. 



12th var. The legs are quite black. 



13th var. Like the last, but the shanks and the fore-thighs 

 are dull white. 



14th var. The body is dull sooty black, oval, short, and plump : 

 the front is convex, and has a tubercle on each side : the feelers 

 are much shorter than the body ; the first and the second joints 

 are not angular ; the fourth joint is much shorter than the third ; 

 the fifth is shorter than the fourth ; the sixth is much shorter 

 than the fifth ; the seventh is more than twice the length of the 

 sixth. 



15th var. The body is black, shining, and has a slight purple 

 tint : the feelers are white, black at the base and towards the tips, 

 shorter than the body : the eyes and the mouth are black ; the 

 base of the latter is dull white : the nectaries are as long as one- 

 sixth of the body : the legs are white ; the hind-thighs, excepting 

 the base, the knees, the feet, and the tips of the shanks, are 

 black. 



16th var. The body is dull black : the feelers are white, blackish 

 at the tips, and half the length of the body : the base of the mouth 

 i3 dull white : the legs are white ; the feet and the tips of the 

 shanks are black : when very young it is dark green with paler 

 limbs. 



17th var. The body is very dark green, of moderate size, some- 

 times nearly black : the feelers are dull white with black tips, and 

 nearly as long as the body : the mouth is also dull white ; its tip 

 and the eyes are black : the nectaries are black, and as long as 

 one-fourth of the body : the legs are white : the knees, the feet, 

 the tips of the shanks, of the hind-thighs, and sometimes also of 

 the middle thighs, are black. On Genista anglica during the 

 summer. 



18th var. ? The body is oval, dull dark red, covered with a 

 white bloom : the feelers are white with black tips, and hardly 

 more than half the length of the body : the mouth is white ; its 

 tip and the eyes are black : the nectaries are black, and as long 

 as one-eighth of the body : the legs are yellowish white ; the 



