338 Mr. F. Walker's Descriptions of Aphides. 



sometimes yellow at the base, and about half the length of the 

 body : the eyes are brown : the mouth is pale yellow with a brown 

 tip : the nectaries do not appear beyond the surface of the abdo- 

 men : the legs are dull brown, short and stout. It acquires its 

 full growth before the middle of May, and is then oval, slightly 

 convex, very pale lemon colour or almost white, half transparent, 

 and much less hairy than A. Coryli : the feelers are pale yellow, 

 and more than half the length of the body : the eyes have a gold 

 colour : the mouth and the legs are pale yellow, and the latter 

 are moderately long : there are sometimes twenty young ones in 

 the body. 



The viviparous winged female. This, as a pupa, is very abun- 

 dant before the end of May ; it is nearly elliptic and rather flat, 

 and of a delicate pale green or yellow colour : the eyes, the feet, 

 and the tips of the joints of the feelers are brown. It acquires 

 wings at the end of May, and then varies much in colour, but it 

 usually has a bright lemon hue ; the feelers are a little shorter 

 than the body : the tips of the joints are brown : the eyes are 

 dark brown : the mouth is pale yellow with a brown tip : the 

 nectaries also are yellow with brown tips, and not one-twentieth 

 of the length of the body : the legs are yellowish white : the 

 wings are colourless, and longer than the body ; the wing-ribs, 

 the rib-veins, and wing-brands are pale yellow ; the other veins 

 are almost white. 



1st variety. Yellowish green, varied with black which prevails 

 on the middle chest : there are four rows of black spots on the 

 back of the abdomen ; the two middle rows are sometimes con- 

 fluent, and form short bands : the feelers are black : the legs are 

 yellowish green, the knees and the feet are darker : the fore-bor- 

 der of the upper wing is tinged with brown, there is a small 

 brown spot at its tip, and one also at the tip of each branch- 

 vein. 



2nd variety. Of a bright lemon colour : the disc of the chest 

 is pale orange : there is a pale brown stripe along the head, and 

 three stripes of the same colour along the fore-chest : the mid- 

 dle chest is slightly streaked with pale brown : there are four 

 rows of brown spots on the back of the abdomen : the feelers are 

 brown, pale yellow at the base, and about half the length of the 

 body : the eyes are red : the nectaries are brown : the legs are 

 pale yellow ; the feet, the tips of the shanks, and the tips of the 

 hind-thighs are brown : the wing- veins are brown, and their tips 

 are clouded. 



3rd variety. Its colour is a fresh and delicate green : the disc 

 of the chest is pale tawny : the eyes are dark green : the feelers 

 are white ; the tips of their joints are brown : the legs are pale 

 yellow ; the hind-thighs are pale green ; the feet are brown. 



