Mr. F. Walker's Descriptions of Aphides. 15 



dark green, but when full-grown it is pale green, oval, convex, 

 plump, and smooth, but not shining : the front is slightly convex, 

 and not notched : the limbs are pale yellow ; the feelers towards 

 their tips, the tip of the mouth, the feet, and the tips of the 

 shanks and of the nectaries are brown : the feelers are rather less 

 than half the length of the body ; the first and the second joints 

 are not angular ; the fourth joint is much shorter than the third ; 

 the fifth is shorter than the fourth ; the sixth is much shorter 

 than the fifth ; the seventh is more than twice the length of the 

 sixth ; the nectaries are about one-sixth or one-eighth of its 

 length. 



1st var. Pale green mottled with dark green. 

 2nd var. Pale yellowish green. 



3rd var. Of a hne amber colour. Intermediate varieties also 

 occur. 



4th var., &c. In midsummer the masses on the young shoots 

 are very thick, and the insect then has a great variety of 

 tints ; its colour passes from pale red or green to the hue of 

 a mellow peach, or to dark red, and sometimes the whole of 

 the body is black : the legs are red ; the four hinder thighs 

 except the base, the knees, the feet, and the tips of the shanks, 

 are black. 



5th var. Pale red, shining, reddish green beneath : the back, 

 with the exception of a line along the middle and the borders of 

 the segments, is red : the feelers are black, green at the base, and 

 shorter than the body : the mouth is green ; its tip, the eyes and 

 the nectaries are black, and the latter are one-twelfth of the 

 length of the body : the legs are black : the fore-thighs, the base 

 of the other thighs, and the shanks except their tips are yellow. 

 On the cherry in July. 



6th var. Bright red, with four or more indistinct rows of little 

 black dots along the back : the head is dark red : the feelers are 

 white, dark red at the base, black towards the tips, and rather 

 more than half the length of the body : the mouth and the legs 

 are dull white ; the tip of the mouth, the eyes, the nectaries, the 

 hind-thighs except the base, the knees, the feet, and the tips of 

 the shanks, are black. End of July. 



In this form it is especially subject to the attacks of its enemies: 

 Trombidium holosericeum devours it ; and anAphidius, anAlloiria, 

 Ceraphron Carpenteri, and Myina Chaonia are its parasites. 



7th var. The feelers are brown, pale yellow at the base ; the 

 mouth is pale yellow with a brown tip : the nectaries are pale 

 yellow with brown tips, and are one- sixth or one-eighth of the 

 length of the body : the legs are pale yellow ; the feet and the 

 tips of the shanks are brown. 



8th var. The body is black, and other varieties occur when it 



