31:0 Mr. F. Walker's Descriptions 0/ 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 1| line ; of the wings 3 lines. 



13. Aphis Quercea, Kaltenbach. 



Aphis Quercea, Kalt. Mon. Pflan. i. 136. 104 ; Ratzeburg, 

 Forst. Ins. iii. 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 tifth 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 ; 

 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 01 

 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. Qucrcus, but it is always shorter : in ^. 

 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 species 

 the third branch-vein is more slender and less distinct than the 

 first or the second veins ; however, when the wings are just un- 



