444 Mr. F. Walker^s Descriptions 0 / Aphides. 
the hind-legs, which are rather long and stout ; the shanks are 
nearly straight : the wings are colourless and of moderate size ; 
the veins are brown and strongly marked ; their borders are 
clouded with brown; the space between the rib- vein and the fore- 
border of the wing is clouded as far as the brand, which is irre- 
gularly spindle-shaped, and for the most part colourless ; the 
first and the second branch-veins are nearly straight ; the third 
is distinct at its source, inclined inwards, and forms two very 
obtuse angles where it throws ofi“ its forks ; the first fork begins 
soon after one- third, the second long after two-thirds, of the length 
of the vein : in the hind-wings the space between the vein and 
the fore-border is clouded for more than half the length of the 
wing ; the tips of the other veins are also clouded : the feet, the 
tips of the shanks, and the tips of the hind-thighs are brown ; 
there is also a slight brown mark at the tip of each of the other 
four thighs. 
Length of the body 2 lines ; of the wings 5 lines. 
The oviparous wingless female. Found at the end of October. 
The body and the limbs are hairy ; the former is pale orange, 
and spindle-shaped : the head is black, slightly varied with orange, 
hairy in front : the breast is pale yellow : there are four rows of 
black spots along the back, the middlb rows consisting of long 
transverse spots, some of them confluent along the back of the ab- 
domen ; there is also a transverse row of four narrow black streaks 
on each interval between the large spots : the abdomen beneath 
is orange ; its tip is yellow and its sides are varied with alternate 
spots of pale yellow and black : the spots on the chest are larger 
than those on the abdomen, and sometimes all the spots on the 
latter are nearly confluent : the feelers are yellow with black tips, 
and about one-fourth of the length of the body : the legs are pale 
yellow ; in the hind -legs the tips of the thighs, the shanks except 
their tips, and the feet except the middle part,'are black. 
The winged male. This also appears at the end of October, and 
much resembles the winged female : the head and the abdomen 
are orange, and the latter has some short black bands on its 
back, those towards the tip are interrupted : the feelers are black, 
yellow at the base, and about half the length of the body : the 
wing-ribs are pale yellow : the wing-brands are brownish black. 
Ninth Group. 
18. Aphis bifrons, n.s. 
A single insect found near London on the 20th of July, 1847, 
on the alder ? 
The viviparous winged female. The body is yellowish brown and 
thickly covered with white })owdcr : the head short and broad ; the 
