1040 LIST OF HOMOPTEROUS INSECTS. 



fifth shorter than the fourth ; sixth shorter than the fourth ; seventh 

 about twice the length of the sixth : nectaries a little more than one- 

 twentieth of the length of the body : legs of moderate length. 



The viviparous winged female. Feelers almost as long as the 

 body ; seventh joint about thrice the length of the sixth : disk of the 

 chest black : legs pale ; feet and tips of the thighs and of the shanks 

 brownish : wings colourless ; distance between the first and second 

 veins almost twice farther at the tips than at the base ; third much 

 nearer to the second at the base than at the tip, as near to the second 

 as the second is to the first; first fork nearer to the third vein than 

 to the second fork, much nearer to the third vein than the third is to 

 the second; second fork generally a little nearer to the fourth vein 

 than to the first fork; fourth vein much curved, a little farther from 

 the tip of the rib-vein than from the second fork. 



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

 tion. 



311. Aphis gracilis. 



Nigricans, gracilis, subtus pollinosa ; antenncs corpora vix breviores ; 

 abdomen viride, cornieulis brevissimis ; pedes pallidi, femori- 

 bus tibiisque apice tarsisque nigris ; alcB albce. 



Blackish, slender, covered beneath with white powder: feelers 

 slender, nearly as long as the body; fourth joint very much shorter 

 than the third; fifth shorter than the fourth ; sixth subclavate,much 

 shorter than the fifth; seventh longer than the fifth: abdomen 

 green; nectaries very short: legs pale, long, slender; feet and tips 

 of the thighs and of the shanks black : wings white ; brands pale, 

 rather long ; veins black towards the tips ; distance between the first 

 and second veins at the tips about thrice that between them at the 

 base ; third much farther from the second at the tip than it is at the 

 base, a little farther from the second at the base than the second is 

 from the first; first fork at the tip nearer to the third vein than to 

 the second fork, much nearer to the third vein than the third is to 

 the second ; second fork nearer to the fourth vein than to the first 

 fork ; fourth vein curved, especially near the base, nearer to the se- 

 cond fork than to the tip of the rib-vein. From the willow, in 

 October. Length of the body 1^ line ; of the wings 3^ lines. 



Var. First fork wanting towards the tip. 



a. England. Presented by F. Walker, Es(X. 



