LIST OF HOMOPTEKOUS INSECTS. 937 



length, and its second very soon after two-thirds, but this structure 

 is variable ; space between the first and second branch-veins at the 

 base, one-fourth of that between them at the tips ; tip of the third 

 vein a little farther from the tip of the second than it is from the tip 

 of the first fork, and than the latter is from the tip of the second 

 fork ; third vein near the tip slightly inclined towards the fourth ; 

 the latter much curved near the base, slightly so from the middle to 

 the tip ; space from its base to the tip of the rib-vein nearly equal to 

 that between the latter and its tip. 



V"ar. Space between the angle of the rib-vein longer in one 

 wing than in the other ; fourth vein moderately curved from the 

 middle to the tip. 



Var. Fourth vein straight from the middle to the tip. 



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



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

 tion. 



4. Aphis comes. 

 Aphis comes, Walk. Ann. Nat. Hist. 2nd Serie, i. 258, 4. 

 England. 



Group 3. Walk. Ann. Nat. Hist. Ser. 2, i. 259. 

 5. Aphis oblonga. 



Aphis oblonga, Von Heyden, JEJnt. Beitr. Mus. Senkenb. ii. Heft. 3. 



Stet. Ent. Zeit. Jahr. v. 12. Kalt. Mon. Pflan. i. 144. Ratz. 



Forst. Ins. iii. 219, 23. Stet. Ent. Zeit. 1844, 9, 81, 133, 410. 



Walk. Ann. Nat. Hist. Ser. 2, i. 259, 5. 

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



Distance between the first and second veins at the base less than 

 one-fourth of that between them at the tips ; third not farther from 

 the second at the tip than at the base, more than twice farther from 

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

 little nearer at the tip to the second fork than to the tip of the third 

 vein, very little farther from the third vein than the third is from the 

 second ; second fork a little farther from the third vein than from the 

 first fork ; fourth vein curved near the base, almost straight towards 

 the tip, much farther from the second fork than from the tip of the 

 rib-vein. 



a. England. (In Canada Balsam). From Mr. Walker's collection. 



3n3 



