Mr. F-. Walker's Descriptions of Aphides. 195 



2nd variety. The head and the feelers are brown, and the lat- 

 ter are nearly as long as the body : the nectaries are also brown. 



3rd variety. The chest and the breast are almost black. 



4th variety. In the beginning of June : it is red while a pupa, 

 but is black when its wings are unfolded at the end of June : 

 the abdomen is dark red : the feelers are longer than the body : 

 the mouth is yellow with a black tip : the nectaries are rather 

 more than one-third of the length of the body : the thighs are 

 pale yellow towards the base ; the shanks excepting the tips are 

 dull yellow : the wing-ribs are pale yellow ; the wing-brands and 

 the veins are pale buff. 



5th variety. The body is dark green : the head, the disc of the 

 chest and that of the breast are black : the feelers are also black, 

 and longer than the body : the mouth is dull green with a black 

 tip. 



6th variety. The body is black : the abdomen is green with a 

 row of black spots on each side. 



The following variations occur in the structure of the veins : — 



1st variety. The lower branch of the first fork is divided like 

 the upper branch. 



2nd variety. There is no first fork. 



3rd variety. The fourth vein is forked, and both the forks are 

 curved. 



4th variety. The upper branch of the second fork is obsolete 

 towards the tip. 



The part of the head on which the feelers are seated is pro- 

 duced on each side, so as to have the appearance of a basal joint 

 to those organs ; these projections are oblique at the tip, and thus 

 form an acute angle on the inner side ; their growth and the con- 

 sequent narrowing of the front much increases as the insect ap- 

 proaches its full development : the first joint of the feelers is broad 

 and is very slightly curved, being convex on the inner side and 

 concave on the outer side ; the second joint is rather more than 

 half the length and half the breadth of the first ; the third is 

 much narrower than the second : the fore-chest is rather long, 

 narrower in front, and slightly convex on each side : the nec- 

 taries are slightly curved and are somewhat narrower, and as it 

 were compressed, near their tips : the tip of the abdomen is 

 compressed, sickle-shaped, and nearly half the length of the 

 nectaries : the legs are long ; the thighs are slightly clavate ; the 

 shanks are somewhat bristly, and very slightly curved, as are 

 also the second joints of the feet : the wing-rib at a little beyond 

 half the length of the wing begins to widen very gradually into 

 the brand, which is long, and irregularly spindle-shaped ; the 

 angle on its hind-border is very obtuse, and the line thence to 

 the tip is slightly curved ; the fourth vein is much curved at its 



