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



3rd var. The second fork in the third vein of the fore-wing is 

 wanting. The length of this second fork is often very variable 

 in the same species, and even in opposite wings of the same 

 Aphis. 



Length of the body f-1 line ; of the wings 2^-3 lines. 



79. Aphis Sorbi, Kaltenbach. 



Aphis Sorbi, Kalt. Mon. Pflan. i. 70. 51. 



The viviparous wingless female. This species is hatched in the 

 middle of March or somewhat later, and then begins to feed on 

 the buds of the apple-trees : it is very small and of a dark green 

 colour : the head, the limbs, and a stripe on each side of the body 

 are still darker : the feelers are not more than half the length of 

 the body : the eyes are dark brown : the mouth reaches the base 

 of the hind-legs : the nectaries are about one-eighth of the length 

 of the body : the legs are rather short and stout. When full- 

 grown the body is nearly round, dark reddish brown, and thickly 

 covered with white powder : the limbs are black : the front is 

 nearly straight, but has three slight tubercles : the feelers are 

 half the length of the body : the nectaries are about one- ninth of 

 its length. 



1st var. Dull green, short, and very plump : the feelers are 

 brown, dull green at the base, and shorter than the body : the 

 eyes are black : the mouth is dull green with a brown tip : the 

 nectaries are black, and as long as one-tenth of the body : the 

 legs are pale yellow, and rather long ; the feet, the tips of the 

 shanks and of the four hinder thighs are black. 



2nd var. Very dark green : the thighs are black with the ex- 

 ception of the base which is pale yellow : the nectaries are one- 

 eighth of the length of the body. 



3rd var. Nearly round, dull reddish green, paler beneath : the 

 feelers are black, and nearly as long as the body : the tip of the 

 mouth is black : the nectaries are as long as one-sixth of the 

 body : the legs are gray, excepting the base of the fore-thighs 

 which is dull yellow. 



4th var. The feelers are hardly half the length of the body. 



5th var. The young one has a large dull tawny spot at the 

 base of each nectary. 



6th var. Dark reddish brown : the limbs are black : the feelers 

 are half the length of the body ; the nectaries are one-ninth of 

 its length. 



7th var. Pale orange. 



8th var. Dark orange. 



9th var. Pale green. 



10th var. Pale buff, darker towards the tip of the abdomen. 



11th var. Pale red, short- elliptic : the feelers are white with 



