40 BRITISH APHIDES. 



Abdomen fusiform, banded with colour. 



Cauda small, pilose ; anal valves very marked. 



Cornicles small, and buccinate in the winged 

 females. 



Legs robust, short, and pilose. 



Wings much shorter and narrower than in Galli- 

 pterus ; cuneato at the tips ; cubitus strong, nervures 

 dilated at their ends into triangular fuscous spots. 



Ptychodes juglandis, Frisch. Plate XCV. 



ApJiis juglaiidis, Frisch. 

 Lachnus juglandis, Kalt., Walk. 

 Gallipterus juglandis^ Koch, Pass. 



It is remarkable that no description of the apterous 

 viviparous female of this species has yet been given 

 by any author. I have never met with it myself, 

 although not a few examples of the other forms have 

 come under my observation. This peculiarity recalls 

 the circumstance that the apterous viviparous female 

 of Drejjanosijjhum ijlatanoides is also unknown. Thus 

 these very different species would seem to show in 

 their metamorphosis a similar characteristic, which 

 amounts to this, that every insect which hatches from 

 the egg assumes wings before it commences its vivi- 

 parous multiplication. Unlike other species of Aphis, 

 every so-called larval form directly passes into a pupa 

 and thence into its imago. 



Pupa. 



Long oval. Head broad. General colour fine 

 yellow tinted with brown and greenish shades. Head 

 with an irregularly cleft rich brown mark, followed by 



