THE CANADIAN ENTOMOLOGIST - 235 



Moreover, the two last never have white flecks upon them, 

 so often noticed in Aphis rumicis, especiaWy in the nympha?. 



In the alate female stage it can at once be told from Aphis 

 cratcEgi by the absence of the basal pale abdominal band and 

 general absence of farinose matter. As I have not seen any alatse 

 of A. nigra, I cannot compare them, but the resemblance to rumicis 

 is great. 



Siphocoryne avenae, Fabricius. 



Aphis aven(E Fabricius. 



Aphis avencE-sativcB Schrank. 



Aphis annua Oestlund. 



Aphis mali Fitch (non Fabricius). 



Aphis cratcEgifolice Fitch. 



Aphis fitchii Sanderson. 



Fabricius, Ent. Syst. IV, 214, 22, 1774; Syst. Rhyng, 297, 21, 1803. 



Schrank, Fr. Boica, II, p. 104, 1801. 



Kaltenbach, Mono. Pflanz., p. 108, 1854. 



Walker, Ann. Mag. Nat. Hist., Sc. 2, V, p. 269, 1849. 



Fitch, 1st Rept. Nox. & Ben. Ins., St. N. Y., pp. 49-60, 1856. 



Fitch, 4th Ann. Rept. Reg. Univ., N. Y., p. 65, 1851, and p. 66 { = crat3^gi- 

 iolis) and Cat. Horn. N. Y., St. Cat., 1851. 



Walker, Cat. Brit. Mus. Homop., p. 986 (mali), 1852. 



Fitch, 6th Rept. Ins. N. Y., pp. 91-97, 1865. 



Walsh, Phil. Ent. Soc, p. 301 { = mali), 1862. 



Walsh, Proc. Ent. II, p. 37 { = mali), 1867. 



Riley, Am. Ent. I, p. 99 ( = mo/0, 1869; and II, p. 178 { = ma[i), 1870. 



Kaltenbach, Die Pflanz. a. d". Klasse, Ins., p. 216, No. 79, 1874. 



Saunders, Rept. Ent. Soc. Ont., p. 344 {=mali), 1877. 



Riley & Monell, Bull. U. S. Geol. & Geog. Surv. V, 1, 25 {^cratsgifoliz), 

 1879. 



Thomas, 8th Report St. Ent. 111., p. 83, 1879. 



Saunders, Canad. Ent. XV, pp. 96-97 { = mali), 1883. 



Osborn, Bull. Iowa Agri. Coll., 2, 91 {=mali), 1884. 



Saunders, Rept. Ent. Soc. Ont., p. 23 { = mali), 1884. 



Fletcher, Rept. Canad. Cent. Exp. Farms, 22 { = mali), 1887. 



Forbes, Trans. 111. St. Hort. Soc, p. 92, 1887. 



Lintner, Rept. Inj. Ins., N. Y., for 1886, p. 118, 1887. 



Oestlund, Aphid. Minn., p. 64 (=ma/0, P- 51 { = cratzgifolix), 1887. 



Riley, Sec. Agri. Rept. U. S. Ent., 1889, p. 348, 351, 1890. 



Hillman, Bull. II, Neb. Agri. Exp. Sta., 1890. 



Hieronvmus & Pax., Herb. Cec. fasc. VI, No. 192, 1890. 



Osborn & Sirrine, Proc. Iowa Acad. Sci. I, pt. Ill, p. 99 { = cratxgifoLia£), 

 1893. 



Webster, Journ. N. Y. Ent. Soc. Ill, p. 119 {=mali), 1893. 



Webster, Insect Life, VI, p. 152 {=mali), 1893. 



Weed, Trans. Am. Ent. Soc. XX, p. 299 {=mali.), 1893. 



Bruner, Rept. Nebr. Hort. Soc, p. 172 { = mali), 1894. 



