Mr. F. Walkers New British Aphides. xliii 



Art. IX. — Descriptions of New British Aphides. By Francis Walker, Esq., F.L.S. 



Aphides on the Petti/ Spurge (Euphorbia peplus). 

 Aphis Euphorbias. 



The wingless viviparous female. — The body is saffron colour, somewhat small, ra- 

 ther flat, nearly linear, or slightly broader towards the abdomen ; the borders and the 

 sutures of the segments are pale yellow : the antennae are pale yellow and very nearly 

 as long as the body ; the tips of the joints are black : the eyes are bright red : the 

 rostrum is pale yellow, with a black tip : the tubes are pale yellow, with black tips, 

 and as long as one-sixth of the body : the legs are long and pale yellow ; the thighs 

 are pale green ; the knees and the tips of the tibiae are dark yellow ; the tarsi are 

 black. 



In the beginning of October. 



Aphides on the Wild Celery (Apium graveolens). 

 Aphis inculta. 



The wingless oviparous female. — The body is very small, short, elliptical, green, 

 covered with white powder : the head, the eyes and the antennas are black, and the 

 latter are nearly one half of the length of the body : the tubes are black and not more 

 than one-twentieth of the length of the body : the tip of the abdomen is black and 

 slightly tapering : the legs are black ; the thighs, except their tips, are green ; the 

 hind tibiae are broad. 



In October, near Fleetwood. 



Aphides on the Parsnip (Pastinaca sativa). 

 Aphis robusta. 



The winged viviparous female. — The body is deep black, larger and stouter than 

 that of A. capreae, which also infests the parsnip : the antennas are black and much 

 shorter than the body : the rostrum is green, with a black tip : the tubes are black 

 and about one-eighth of the length of the body : the legs are black and moderately 

 long ; the tibiae, except the tips, are yellow : the wings are colourless and nearly twice 

 the length of the body; the squamulae are pale yellow; the stigmata are dull buff; 

 the veins are brown, and their tips are slightly clouded. 



The wingless viviparous female. — When young it is very dark green or almost 

 black : the antennae and the legs are short and stout : the tubes are very stout : the 

 body soon becomes quite black, and increases in breadth and thickness. 



Aphides on the Willow (Salix caprea). 



Aphis alterna. 



The winged viviparous female. — The body is small and black : the abdomen is ra- 

 ther dark green : the antennae are almost filiform and much shorter than the body : 



