198 Mr. F. Walker's Desciiptions 0/ Aphides. 



ning, brassy, with six rows of tubercles along its back : the feelers 

 are black, and very nearly as long as the body : the eyes and the 

 mouth are also black : the nectaries are black, cylindrical, and as 

 long as one-fifth of the body : the tip of the abdomen is prominent, 

 and forms a short tail : the legs are long and black ; the base of 

 the thighs is white. When the insect is very young it is dull 

 dark red : the feelers and the legs are brown : the nectaries are 

 as long as one- eighth of the body, or sometimes shorter : the 

 bronze colour appears first on the fore-part of the body. 



1st variety. Black, dull, slightly bristly, with transverse rows 

 of tubercles across each segment : the head and the abdomen are 

 dark reddish brown : the feelers are bristly and a little longer 

 than the body : the nectaries are as long as one -fourth of the 

 body : the legs are hairy; the thighs are yellow towards the base. 

 The young ones are dark red. 



2nd var. The legs are yellow ; the feet and the tips of the thighs 

 are black. 



3rd var. The body is dark red with a bronze tint : there are 

 four rows of very small tubercles along the back which is finely 

 granulated : the limbs are black ; the base of the thighs and that 

 of the mouth are yellow : the nectaries are as long as one-fifth of 

 the body. 



4th var. The body is green. 



5th var. While young the body is rose-colour or pink : the 

 limbs are white with black tips to the joints. 



6th var. The back is tuberculate in transverse ridges : the feel- 

 ers are a little longer than the body : the mouth is pale yellow 

 with a black tip : the nectaries are as long as one-fourth of the 

 body : the tip of the abdomen is pale red : the legs are yellow ; 

 the feet, the tips of the shanks, and the thighs towards the tips 

 are black. 



7th var. The limbs are dull yellow ; the feelers are black at the 

 base and towards the tips and longer than the body ; the mouth 

 and the nectaries have black tips, and the latter are as long as 

 one-fourth of the bqdy ; the knees, the feet, and the tips of the 

 shanks are also black. 



It continues on the knapweed till the beginning of November, 

 and often resorts to the base of the leaves for shelter during the 

 latter part of the autumn : when punctured by an Aphidius it re- 

 treats to the top of the plant, and dies there. 



The front is convex in the middle, and is narrow, being occu- 

 pied on each side by the tubercles or apparent basal joints on 

 which the feelers are seated : these tubercles are rather shorter 

 than those of A. Rosa; the first joint of the feelers is very 

 slightly curved; the second is about half the length and 

 breadth of the first ; the third is more slender than the second; 



