LIST OF HOMOPTEROUS INSECTS. 979 



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

 hardly nearer to the second fork at the tip than it is to the third vein, 

 a little 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 

 slightly curved, straight towards the tip, farther from the tip of the 

 rib-vein than from the second fork. 



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

 b — r. England. (In Canada Balsam). From Mr. Walkers collec- 

 tion. 



77. Aphis triehoda. 



Aphis trirhoda, Walk. Ann. Nat. Hist. Ser. 2, iv. 45, 69. 



Distance between the first and second veins at the tips more 

 than twice that between them at the base ; third nearer to the second 

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

 second is to the first ; first fork generally nearer to the second fork 

 than to the third vein, as near to the third as the third is to the se- 

 cond ; second fork generally as near to the first fork as to the fourth 

 vein ; fourth vein farther from the rib-vein than from the second 

 fork. 



a—g. England. (In Canada Balsam). From Mr. Walker's coi- 

 tion. 



78. Aphis BrassicvE. 



Aphis Brassicse, Linn. Syst. Nat. ii. 734, 12. Faun. Suec. 2205, 



985. Fair. Sp. Ins. ii. 388, 35. Mant. Ins. ii, 316, 40. Ent. 



Syst. iv. 218, 41. Syst. Rhyn. 300, 41. Gmel. Ed. Syst. Nat. 



i. 2205, 12. Schrank, Faun. Boic. ii. 119, 1228. Mull. Fn. 



Frid. 30, 283. Frisch. Ins. xi. 10, pi. 3, f. 15, 81. Harr. 



Exposit. Engl. Ins. 66, pi. 17, f. 4—6. Berk. Syn. i. 120. 



Stew. El. Nat. Hist. ii. 1 10. Turt. Syst. Nat. ii. 207. Swamm. 



Ins. v. 535. Kalt. Mon. Pflan. i. 106, 81. Harris, Ins. New 



Engl. 190. Curt. Journ. Roy. Agric. Soc. iii. 54, pi. C. f. 5, 



6. Walk. Ann. Nat. Hist. Ser. 2, iv. 46, 70. Fitch, The 



Senate, No. 30, 65. 

 Aphis Bapharis, Schrank, Faun. Boic. ii. 1, 119, 1229. 

 Aphis Isatidis, Fonscol. Ann. Soc. Ent. Fr. x. 165, 4. 

 Aphis Floris Rapae, Curt. Journ. Roy. Agric. Soc. iii. 55, pi. C. f. 



7,8. 



