986 LIST OF HOMOPTEBOUS INSECTS. 



Distance between the first and second veins at the base less 

 than half that between them at the tips ; third much farther from 

 the second at the tip than at the base, a little farther from the se- 

 cond at the base than the second is from the first ; first fork very 

 much nearer to the second fork at the tip than to the third vein, as 

 near to the third vein as the third is to the second ; second fork as 

 near to the fourth vein as to the first fork ; fourth vein curved near 

 the base, almost straight towards the tip, very much nearer to the 

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



Var. First fork a little nearer to the third vein than the third is 

 to the second. 



Var. Distance between the first and second veins at the base 

 less than one-third of that between them at the tips ; third a little 

 farther from the second at the tip than at the base, much farther 

 from the second at the base than the second is from the first ; first 

 fork at the tip four times farther from the third vein than from the 

 second fork ; second fork more than twice farther from the fourth 

 vein than from the first fork. 



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

 lection. 



86. Aphis Padi. 



Aphis Padi, Linn. Syst. Nat. ii. 734, 8. Faun. Suec. 981. Reaum. 



Ins. iii. pi. 23, f. 9, 10. Fabr. Sp. Ins. ii. 389, 45. Mani. Ins. 



ii. 317, 50. Ent. Syst. iv. 220, 50. Syst. Rhyn. 301, 50. 



Gmel. Ed. Syst. Nat. i. 2203, 8. Schrank, Faun. Boic. ii. 



115, 1216. Stew. EL Nat. Hist. ii. 110. Turt. Syst. Nat. ii. 



708. Kalt. Man. Pfian. i. 74, 53. Ratz. Forst. Ins. iii. 217, 



8. Walk. Ann. Nat. Hist. Ser. 2, v. 274, 78. 

 Padifex, Amyot, Ann. Soc. Ent. Fr. 2me SSrie, v. 477, 523. 



Distance between the first and second veins at the tips full 

 thrice that between them at the base ; third very much farther from 

 the second at the tip than at the base, very much farther from the 

 second at the base than the second is from the first ; first fork much 

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

 third vein than the third is to the second ; second fork as near to the 

 fourth vein at to the first fork ; fourth vein long, curved near the 

 base, straight towards the tip, full twice farther from the tip of the 

 rib-vein than from the second fork. 



a. Scotland. Presented by E. Doubleday, Esq. 

 b — zzz. England. (In Canada Balsam). From Mr. Walker's col- 

 lection. 



