948 LIST OF HOMOPTEROUS INSECTS. 



Group 10. Walk. Ann. Nat. Hist. Ser. 2, i. 445. 

 19. Aphis Populi. 



Aphis Populi, Linn. Syst. Nat. ii. 736, 27. Faun. Suec. 997. 



Swammerd. Hist. Nat. Coll. Acad. v. 531. RSaum. Ins. iii.pl. 



26, f. 7— 11, pi. 27, f. 1—14. Deg. Ins. iii. 94, 15, pi. 7, f. 



1—7. Fabr. Sp. Ins. ii. 386, 22. Mant. Ins. ii. 316, 27. 



Ent. Syst. iv. 216, 27. Syst. Rhyn. 298, 27. Schrank, Faun. 



Boic. ii. 1, 113, 1211. Gmel Ed. Syst. Nat. i. 2207, 27. 



Hausmann, Illig. Mag. i. 443, 6. Stew. El. Nat. Hist. ii. 111. 



Turt. Syst. Nat. ii. 705. Rossi, Faun. Etrusc. 260, 1371. 



Samouelle, Comp. i. 4. Enc. Meth. Hist. 527. Ins. pi. 116, 



f. 1 — 5. Nouv. Diet. Hist. Nat. xxviii. 254. Rusticus, Ent. 



Mag. iii. 337. Kalt. Mon. Pflan. i. 126, 98. Ratz. Forst. Ins. 



iii. 218, 16. Walk. Ann. Nat. Hist. Ser. 2, i. 445, 19. 

 Aphis Populeti, Panz. Faun. Ins. Germ, lxxviii. 18. 

 Aphis Populi albae? Fonscol. Ann. Soc. Ent. Fr. 187, 29. 



Rib-vein hardly approaching the fore border, and then very 

 slightly diverging from it ; its angle is very hlunt and hardly per- 

 ceptible ; the space thence to the tip is full three-fourths of the whole 

 length of the part which forms the angle, and rather more than half 

 the length from its tip to the tip of the fourth vein ; first vein very 

 oblique to the rib-vein ; the length from its source to the base of 

 the wing is less than three-fourths of the length of the base from its 

 tip ; second vein more oblique than the first vein, from which its dis- 

 tance at the base is almost one-third of that at their tips; its 

 distance at the base from the first vein is rather less than one- 

 third or than one-fourth of that length from the base of the 

 first to the base of the wing ; the distance between the tips of 

 the first and second veins is nearly half that between the tip of 

 the first and the base of the wing; third vein vanishing at its 

 source, almost parallel to the second till near the tip, their mutual 

 distance on the hind border a little exceeding that between them on 

 the rib- vein, and the latter distance is much more than that between 

 the first and second veins, but on the hind border it is much less ; 

 space between the two forks of the third vein much longer than 

 the basal part or than the second fork, which are about equal in 

 length ; space between the tip of third vein and that of its first fork 

 more than that between the tips of the second and third veins, and 

 still more than that between the tips of the first and second forks; 

 space between the tips of the first and second forks a little less 



