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



ribs are yellow ; the wing-brands are pale brown ; the veins are 

 brown. 



16th var. The body is black and very small : the feelers are as 

 long as the body : the mouth is dull yellow with a black tip : the 

 nectaries are as long as one-eighth of the body : the fore-thighs 

 are yellow at the base ; the shanks are dark yellow with black 

 tips : the wing-ribs are yellow ; the brands are pale brown ; the 

 veins are dark brown, and very distinct. 



17th var. The body is black : the abdomen is green : the feel- 

 ers are a little more than half the length of the body : the mouth 

 is yellow towards the base : the nectaries are as long as one-sixth 

 of the body : the legs are black; the fore-thighs at the base, and 

 the shanks except their tips are yellow : the wing-ribs are yel- 

 low; the brands and the veins are brown. 



18th var. The body is black : the borders of the fore-chest 

 and the abdomen are dark green ; the back of the latter is black : 

 the feelers are nearly as long as the body : the mouth is pale yel- 

 low with a black tip : the nectaries are black, and as long as one- 

 sixth of the body : the legs are pale yellow ; the four hinder 

 thighs, the knees, the feet, and the tips of the shanks are black : 

 the wing-ribs and the rib-veins are pale yellow ; the brands and 

 the other veins are pale brown. 



19th var. The fourth joint of the feelers is full half the length of 

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

 longer than the fifth ; the seventh is a little longer than the sixth. 



20th var. The fourth joint is nearly half the length of the 

 third ; the fifth and the sixth are slightly club-shaped, and are 

 each as long as the fourth ; the seventh is hardly longer than the 

 sixth. 



21st var. The sixth joint is a little longer than the fifth. 



22nd var. The third joint is as long as the three following 

 joints, and the seventh is about thrice the length of the sixth. 



23rd var. While a pupa it resembles the wingless Aphis, but 

 the rudimentary wings are pale green : sometimes the body has 

 two lively green stripes along the abdomen, and the colour varies 

 to pale red which is sometimes varied with green and with brown. 

 When winged it is dull greenish yellow : the disc of the chest 

 and that of the breast are black : there is a brown band across 

 the fore-chest : the feelers are shorter than the body : the mouth 

 is yellow with a black tip : the nectaries are pale yellow with 

 black tips, and as long as one-fifth of the body : the thighs are 

 pale yellow. 



24th var. While a pupa the body is pale green varied with 

 dark green, or pale red varied with yellow : the head and the 

 fore-chest are pale red : the legs are pale greenish yellow ; the 

 feet are black. 



