Mr. F. Walker's Descriptions 0/ Aphides. 335 



pendieular to the main vein, and the first vein still more so ; and 

 this structure of the veins is peculiar to the group of species to 

 which this, with ^. Quercus, Quercea, Alni, Coryli, Juglandicola, 

 Platanicola, &c., belongs ; the first and the second veins are di- 

 stinctly joined to the main vein : the legs are very slender. 



1st variety. Yellow speckled with orange. 



2nd variety. Orange. 



3rd variety. Pale red. 



Sometimes the lower branch of the first fork of the third vein 

 is wanting ; in another case the lower branch of the second fork 

 is wanting ; and in the other fore-wing of the same insect the 

 first branch-vein is quite wanting ; the second and the third do 

 not reach the border of the wing ; the second has a short fork, but 

 the third has none. 



The oviparous wingless female. This appears at the end of Sep- 

 tember: it is orange, nearly oval, and the tip of the abdomen 

 is slightly produced into a tube : the limbs are yellow : the feelers 

 are shorter than the body ; the sixth joint is about half the length 

 of the fifth ; the seventh is longer than the sixth ; the tips of the 

 joints and the tip of the mouth are brown : the hind-shanks are 

 slightly dilated. 



The winged male. This resembles the winged female, but its 

 colour is darker : the head, the disc of the fore-chest, the lobes of 

 the middle-chest, a spot on each side of it, and a row of short 

 bands along the back of the abdomen are brown. It pairs with 

 the oviparous female at the end of September and in the be- 

 ginning of October. 



The bright yet delicate colour of this species makes it a beau- 

 tiful object. 



Length of the body 1^ — li line ; of the wings S^ — 4 lines. 



10. Aphis Juglandina, n. s. 



The viviparous winged female. The body is nearly linear and 

 rather broad : the head is broad ; the front is very prominent, and 

 forms a right angle : the feelers are a little longer than the body ; 

 the fourth joint is a little more than half the length of the third ; 

 the fifth joint is a little shorter than the fourth ; the sixth is a 

 little less than half the length of the fifth ; the seventh is rather 

 less than twice the length of the sixth : the body is pale buiF, 

 and has a dark line along the back of the head and of the fore- 

 chest whose sides are deeply notched : the nectaries hardly rise 

 above the surface of the abdomen : the legs are yellow and of 

 moderate length ; the feet and the tips of the shanks are darker ; 

 the fore-legs are but little shorter than the hind-legs : the wings 

 are colourless and rather long; the main vein is inchned as 

 usual, first inwards, then outwards, where it forms a veiy obtuse 



