Lawson on Aphis Avenoe. 269 



tips; third farther from the second at the tip than it is at the 

 base, as near to the second at the base as the second is to the 

 first ; first fork nearer to the second fork than to the third vein, 

 nearer to the third vein than the third vein is to the second ; se- 

 cond fork a httle nearer to the fourth vein than to the first 

 fork ; fourth vein much curved near the base, almost straight to- 

 wards the tip, very much nearer to the second fork than to the 

 tip of the rib-vein." 



The synonymy of this species is as follows : — 



Aphis Avence, Fabricius. Schrank ; Gmelin Ed., Syst. Nat. 

 Linn. 1, pt. 4, p. 2206. Villers, Stewart, Turton Ed., Syst. Nat. 

 Linn. 11, pt. 1, p. 705. Macquart, Walker, " Ann. Nat. Hist, 

 ser. 2, III, pp. 45, 57," and in List of Homop. Insects in Brit. 

 Mus. IV, p. 972. 



Aphis granaria^ Kirby, " Linn. Trans. IV, p. 238," 



Curtis. Fitch, Count. Gent., Albany, N. Y., Aug. 16,1861, 

 XVUI, p. 114. 



Aphis Hordei^ Kyber. 



Aphis cerealis, Kaltenbach. 



Bromaphis, Amyst, *• Ann. Soc. Ent. Fr., 2e Serie, V, p. 479. 



In order to ascertain with precision whether our Canadian in- 

 sect was identical with the European one, I sent specimens to Mr. 

 Walker of the British Museum, who is well known to be the 

 ablest authority in this difficult and confused branch of Entomo- 

 logy, and he, in the kindest manner examined the specimens and 

 expressed himself as sure of its identity with the European species. 

 Dr. Asa Fitch, of Salem, Mass., who has studied the habits of the 

 new aphis with great care, writes to me that he is satisfied of its 

 identity with the A. avence of Europe. Mr. Walker in his letter 

 to me dated South Grove, Highgate, near London, Sept. 19, 1861, 

 observes : — " The colour of this and of many other kinds of Aphis 

 is very variable, and is therefore of no use in identifying the spe- 

 cies. It occurs of different shades of green-red and of brown, and is 

 occasionally mottled with these colours. I do not think that there 

 is need to be much alarmed at its appearance, or that it will inflict 

 serious or permanent injury, for its swarms are only occasional, 

 and not annual. When it is once established on the corn, the 

 attempt to arrest its ravages is useless, neither do 1 believe that it 

 can be hindered from migrating to the corn, for its natural or 

 original food is various kinds of grass, and when its wings are 



