112 BRITISH APHIDES. 



Ineli. Millimetres. 



Length of antennee 0*055 1"39. 



cornicles 0'005 0-12. 



Small, linear, brilliant green, covered more or less 

 with yellowish meal. One, or sometimes three, darker 

 green stripes down the back. Antennae and legs pale 

 green. Tarsi smoky. Cornicles dark grey, and very 

 small. Eyes black. Abdomen pointed. Cauda green 

 or smoky-grey. 



Winged viviparous female. 



Pale green. Head, pro thorax, and thoracic lobes 

 shining dark olive-green or olive-black. Abdomen 

 oval, pointed behind ; wholly green. Cornicles as in 

 the larva. Tail minute, about as long as the cornicles. 

 Wings delicately veined; insertions, cubitus, and 

 stigma green ; other veins darker. Legs green, with 

 dark tarsi. The insect is more or less coated with 

 meal. 



The pupa is not unlike the apterous female. 



Taken on the river-reeds near Bramber, Sussex, and 

 on Arundo phragmitis, in the fens near Norwich. They 

 sometimes are exceedingly numerous on the uiypev 

 surface of the leaves, and powder them with their 

 yellow dust. 



In smaller numbers, they form small depressions on 

 the leaf, within which they cluster. Walker considers 

 that this species is identical with H. pruni, but says 

 that it is not the insect he took from Salsola hali, to 

 which he gave the name Aphis arundinis. I consider 

 H. arnndinis to be distinct from H. pruni^ from which 

 it differs both in size, in form, and habit. It is much 



