Mr. F. Walker's Descriptions of Aphides. 21 



knees, the feet, and the tips of the shanks are black : it is smaller 

 and narrower than the preceding variety, and its colour is less 

 intense : when very young it is linear, and sometimes of a pale 

 red or green colour : the pupa agrees in colour with the wingless 

 Aphis, and has sometimes a green tinge. This, which may be 

 a distinct species, also feeds on Genista anglica. 



19th var. The body is black, oval, convex, plump, smooth, and 

 shining, but often covered with a white bloom : the antennas are 

 white with black tips, and about half the length of the body ; 

 sometimes they are black, dull white towards the base : the 

 mouth is white, black towards the tip : the nectaries are as long 

 as one-sixth of the body : there is a short tube at the tip of the 

 abdomen : the fore- and the middle-legs are sometimes black, but 

 more often white, with the exception of their knees, feet, and the 

 tips of their shanks : the hind-legs are black with white shanks. 

 On the furze in the autumn, often attended by Formica nigra. 



20th var. Black, oval, convex, of moderate size : the feelers 

 are pale green, and shorter than the body ; their tips are black : 

 the mouth also is pale green ; its tip and the eyes are black : the 

 nectaries are pale green, and rather less than one-sixth of the 

 length of the body ; their tips are black : the legs are pale green, 

 and moderately long; the feet and the tips of the shanks are 

 black. Its colour when young is dull dark green. On Dahlia 

 superflua in the middle of June 1846. 



21st var. Very dark green, sometimes almost black : the feel- 

 ers and the mouth are dull white with black tips, and the former 

 are nearly as long as the body : the eyes and the nectaries are 

 black, and the latter are as long as one-fourth of the body : the 

 legs are white ; the knees, the feet, and the tips of the shanks 

 and of the hind-thighs, and sometimes also of the middle-thighs, 

 are black. On Genista anglica in June. 



22nd var. Velvet-like black : the feelers are white with a black 

 tip to each joint, and a little shorter than the body : the nectaries 

 are shorter than one-twelfth of the body : the legs are white with 

 the exception of the knees, the feet, and the tips of the shanks. 

 Middle of October. 



23rd var. Deep black : the feelers are white, and more than 

 half the length of the body ; they are brown at the base and 

 towards the tips : the mouth is black : the nectaries are as long 

 as one- tenth of the body : the legs are white ; the four hinder 

 thighs excepting the base, the feet, and the tips of the shanks, 

 are black. 



24th var. The nectaries are as long as one-sixth of the body : 

 the legs are black ; the shanks are yellow with black tips : the 

 wing-ribs are white; the wing-brands are pale brown ; the veins 

 arc brown ; sometimes it is covered with a white bloom, and its 



