944 LIST OF HOMOPTEROUS INSECTS. 



than that of the whole length of the brand, and also rather less than 

 the space between its tip and that of the second fork of the third 

 vein ; the third vein is invisible at its source, but its direction is to- 

 wards the rib-vein at the point where the latter begins to widen ; its 

 length before the first fork is longer than its second fork, and still 

 more so than the space between the forks ; its distance from the 

 second vein at the base is less than half of their mutual distance at 

 their tips, and hardly half the distance between the base of the 

 second and that of the first vein ; the distance between the tip of 

 the forks of the third vein is about equal to the space between the 

 tip of the second fork and that of the fourth vein, and less than that 

 between its tip and that of the first fork ; the distance between the 

 second and the third veins at their tips is very much less than that 

 between the tips of the second and first veins ; the distance between 

 the first and the second veins at the base less than half the distance 

 between them at their tips. 



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

 tion. 



14. Aphis Alni. 



Aphis Alni, Fair. Sp. Ins. ii. 386, 21. Mant. Ins. ii. 316, 26. Ent. 



Syst. iv. 215, 26. Syst. Rhyn. 298, 26. Gmel. Ed. Syst. Nat. 



i. 2206, 54. Beg. Ins. iii. 47, 4, pi. 3, f. 15—17. Berk. Syn. 



i. 121. Stew. El. Nat. Hist. ii. 110. Latr. Gen. iii. 173. 



Kirby $• Spence, Intr. Ent. iii. 76. St. Farg. et Serv. Enc. 



Meth. Hist. Nat. x. 248. Kalt. Mon. Pflan. i. 137, 105. 



Ratz. Forst. Ins. iii. 219, 24. Walk. Ann. Nat. Hist Ser. 2, i. 



341, 14. 

 Kermes Alni ? Enc. MSth. Hist. Nat. Ins. pi. 119, f. 2—4. 

 Aphis maculata, Von Heyden, Mus. Senk. ii. 297. 

 Clethraphis, Amyot, Ann. Soc. Ent. Fr. 2me Serie, v. 480. 



The rib-vein is parallel to the fore border till it approaches the 

 latter, and again diverges from it ; it encloses no brand, and does 

 not form an angle, but is slightly curved outward till it joins the 

 fore border ; the widened part is rather short ; there are no traces 

 of the fourth vein except at its tip, which is nearer to the tip of the 

 third vein than to that of the rib-vein : the third vein springs from 

 the rib-vein a little after the beginning of the widened part ; its 

 length before the first fork is as long as the space between the forks, 

 and a little longer than the second fork ; the distance between the 

 tips of the forks is much more than that between the tip of the 



