Mr. F'. Walker’s Descriptions of Aphides. jae 
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 antennz 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 feei- 
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 
are brown ; sometimes it is covered with a white bloom, and its 
