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



the body : the legs are dull pale green, slender, and rather short; 

 the knees are somewhat darker. On the leaves of the elder in 

 the middle of March 1846. 



1st var. Extremely dark green, apparently black, covered with 

 a white bloom, and having a row of punctures on each side of the 

 body : the front is slightly convex, and not notched : the feelers 

 are black, and rather more 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 a little shorter than the 

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

 much more slender than the sixth, and nearly twice its length : 

 the eyes are also black : the mouth is very dark green : the nec- 

 taries are black, and about one- eighth of the length of the body, 

 and slightly tapering : the legs are very dark green, and mode- 

 rately long. When young it is green, linear, and somewhat 

 narrow and flat. In thick swarms on the shoots of the elder, 

 which are sometimes quite hidden by the clusters, from the end 

 of May to July. 



2nd var. Like the preceding, but with a reddish tinge. 



3rd var. The body is green. 



4th var. The nectaries are about one-sixth of the length of the 

 body. 



The viviparous ivinged female. While a pupa it is elliptical, 

 rather paler and more flat than the wingless female, and it has 

 interrupted white bands across the abdomen : the chest and the 

 rudiments of the wings are green, and they have sometimes a 

 reddish tinge. Wlien winged the body is rather large, black, 

 shining, nearly linear : the feelers are black, stout and thick, and 

 more than half the length of the body ; the fourth joint is much 

 shorter than the third ; the fifth is full as long as the fourth ; 

 the sixth is rather more than half the length of the fifth ; the 

 seventh is longer than the sixth : the abdomen beneath and the 

 mouth are very dark green : the nectaries are black, and about 

 one-sixth of the length of the body : the legs are black ; the 

 fore-thighs are dark green at the base : the wings are slightly 

 gray, and not much longer than the body; the wing-ribs are 

 yellowish white ; the brands are pale brown ; the veins are black, 

 strongly marked, and very slightly clouded ; the first vein diverges 

 more from the second than the second from the third ; the latter 

 is obsolete at its source, and its first fork is after one-third, and 

 its second still more after two-thirds of its length ; the fourth 

 vein is moderately curved at its base, nearly straight towards its 

 tip, and the angle whence it springs is very slight. Length of 

 the body 1-1 \ line ; of the wings 2|-3^ lines. 



[To be continued.] 



