20 BRITISH APHIDES. 



lengtli of the sixth, but is somewhat variable in length. 

 Thoracic lobes brown. Abdomen slightly ringed. 

 Nectaries very small. Cauda yellow and rather large. 

 Legs moderately long. Wings pointed. Cubitus and 

 stigma yellow. Other veins pale brown and clouded 

 at their tips. Often the cubital vein does not touch 

 the cubitus. 



Apterous oviparous female, 



luch. Millimetres. 



Size of body O-lOOxO-050 2-54xl-27. 



Length of antennee 0*040 1*01. 



Less linear than the pupal form. Bright yellow 

 tinged with crimson. A crescental brown mark on 

 the head carried over the thorax. Abdomen with a 

 broad brown bar followed by three or more other inter- 

 rupted bars, and a very broad pa.tch of the same colour 

 on the lower dorsum. Tail elongated into a kind of ovi- 

 positor and tipped with bristles. AntennjB and necta- 

 ries very short. The seventh joint of the latter reduced 

 almost to a " nail." 



Apterous male. 



Very small. Bright yellow, or pale brick-red, with 

 a red dorsal stripe crossed by seven or more transverse 

 stripes of the same colour, thus giving a gay appear- 

 ance to the insect. These males are not uncommon 

 in early October, when they mix with the oviparous 

 forms. Their bodies are internally crowded with 

 oily globules, which in great measure furnish the 

 general ground colour of the insects, pigment being 

 alone deposited in the fascial marks. Dissection clearly 

 proved the sex of these specimens. 



Winged male. 



These insects are more brilliant in colour and band- 

 ing than the other forms. Grround colour fine yellow. 



