946 LIST OF HOMOPTEROUS INSECTS. 



species, the chest is much developed, and the abdomen is small. In 

 two instances the female has a distinct brand like that of the male. 



Var. Male. — The third vein is joined by a cross- vein to the 

 second a little before half the distance from the base of the first 

 fork. 



Var. Male. — The second branch-vein is obsolete for the latter 

 half of its length, and the lower branch of the first fork of the third 

 vein is also forked soon after its source ; these forks diverge much 

 from each other, and pass to the lower border of the wing. 



Var. Fern. — The second vein is forked near its base, one fork 

 joins the rib-vein, and the other fork joins the base of the third vein. 



Var. Male. — A little cross-vein communicates between the se- 

 cond and the third veins near their base. 



Var. Male and Fern. — Third vein before the first fork longer 

 than the space between the forks, and much longer than the second 

 fork. 



a— u. England. (In Canada Balsam). From Mr. Walker's collec- 

 tion. 



16. Aphis Platani. 



Lachnus Platani, Kalt. Mon. Pflan. i. 152, 5. 



Aphis Platani, Walk. Ann. Nat. Hist. Ser. 2, i. 344, 16. 



Rib-vein approaching the fore border, near the brand beneath 

 it diverges much, and forms an obtuse angle; brand broad, brown, 

 with a colourless spot ; distance between the first and second veins 

 more than twice farther at the tips than at the base ; second and 

 third veins slightly undulating ; third almost twice farther from the 

 second at the tip than at the base, much nearer to the second at the 

 base than the second is to the first: first fork a little nearer to the 

 second fork than to the third vein, generally as near to the third 

 vein as the third is to the second ; no fourth vein. 



This species, with A.Juglandis and the eight preceding species, 

 forms a genus or group, which is chiefly characterised by the up- 

 rightness of the first vein. 



a—f. Russia. Presented by F. Walker, Esq. 



