340 Mr. F. Walker^s Descriptions of Aphides. 
the female_, and they are hardly clouded : the feelers^ like the legs, 
are tawny, and their joints have not black tips ; they are much 
thicker than those of the female, with the exception of the seventh 
joint, which is much more slender and rather shorter than the 
sixth ; the nectaries are paler than those of the female, whose 
wing-brand is sometimes colourless like that of A. Quercea. 
Length of the body line ; of the wings 3 lines. 
13. Aphis Quercea, Kaltenbach. 
Aphis Quercea, Kalt. Mon. Pflan. i. 136. 104 ; Ratzeburg, 
Forst. Ins. hi. 218. 
The viviparous winged female. The front of the head is notched 
or crenulate, but without tubercles at the base of the feelers, 
which are very much longer than the body ; the fourth joint is 
very much shorter than the third ; the fifth is much shorter than 
the fourth ; the sixth is about half the length of the fifth ; the 
seventh is a little longer than the sixth : the sides of the fore-chest 
are notched : the back of the abdomen near the base bears a horn 
armed with two forks or hooks : the nectaries are not more than 
one-twelfth of the length of the body : the legs are long and 
slender ; the fore-legs are not much shorter than the hind-legs y 
there is a dark spot at the tip of each thigh : the tip of the abdo- 
men, as in the other species of this group, is not compressed nor 
sickle-shaped : the feelers and legs of the pupa, which often has a 
beautiful rose colour, are shorter than those of the winged insect, 
and the young ones are very clearly seen in the body of the 
former, whose horn is very short and indistinct. The fourth 
joint of the feelers is sometimes not more than half the length of 
the third ; and the fifth is as long as the fourth ; and there are 
gradations between these varieties : the sides of the fore-chest 
and the front of the head are sometimes straight, and sometimes 
notched : the wings are colourless ; the veins are not straight ; 
the main vein does not widen towards its tip as in other species ; 
it is bent first inwards, then outwards, where it forms an angle 
from whence springs the fourth vein, and it is clouded at each 
end of the sides of this angle ; the first branch-vein is rather per- 
pendicular, and like the second is joined to the main vein ; the 
third does not quite join the main vein, but comes very near to 
it, and is forked a little after one-third and forked again a little 
after two-thirds of its length ; its base is quite clear, but in the 
other veins that part is slightly clouded : the brand is sometimes 
coloured like that of A. Quercus, but it is always shorter : in A, 
Quercus the seventh joint of the feelers is a little shorter than the 
sixth ; in A. Quercea it is a little longer : in both these s])ecies 
the third branch-vein is more slender and less distinct than the 
first or the second veins ; however, when the wings arc just un- 
