34 BRITISH APHIDES. 



Body long, oval. Plentifully covered with a whitish 

 mealy coat, both on the upper and under sides. When 

 this is removed by a drop of spirits of wine the body 

 below is greyish green, with eight black spots ranged 

 down each side of the back, which increase in size as 

 they approach the tail. Antennae green, with black tips, 

 shorter than the body. Eyes and legs black. Cornicles 

 very short and black. Tail also small and black. 



The young when first hatched are oval, shining, 

 and bright yellow. They are divested of the mealy 

 coat above noticed. Their antenna are rudimentary 

 and deficient in the true number of joints. 



Pupa. 



Dirty green, much corrugated. Wing-cases dark 

 olive green or grey black. 



Winged viviparous female. 



Incli. Millimetres. 



Expanse of wings 0"270 6'85. 



Size of body 0*080 X 0-035 2-02 X O'OBB. 



Length of antennse 0*060 1'54. 



„ cornicles 0*005 0*12. 



Head, neck, and thoracic lobes, black. Antennae 

 and nectaries dark brown. Eyes black. Rest of the 

 body yellowish green. Abdomen with a row of fine 

 punctures on each lateral edge, with several obscure 

 transverse dorsal marks. Legs dusky brown, pilose. 

 Tail dark green or brown, hairy. Cornicles short and 

 brown, as also is the tip of the rostrum. This last 

 organ reaches to the second coxae. Wings rather 

 short, with stout coarse veins and dark stigma. 



This species feeds on a variety of plants, such as 

 Raphanus sativus, Sinapis arvensis, Gapsella hursa- 

 pastoris, and the garden cabbage, Brassica oleracea, 

 both the upper and under sides of the foliage of which 

 last plant it often crowds in such numbers that the 

 leaves become hidden by the living mass. Indeed, 



