686 : Rosert MATHESON 
Aphis avenae is very characteristic in color and is easily identified. 
It is yellowish green, with a dark green band extending the full length 
of the abdomen. This band is expanded laterally at the base of each 
segment, as shown in Plate XXI. 
THE GREEN APPLE APHIS 
(Aphis pomi De Geer) 
SYNONYMY 
The green apple aphis is a European insect. When and where it was 
introduced into America will in all probability never be definitely known. 
Unfortunately European writers have so confounded this species with 
the other two common plant lice of apple that it is extremely difficult, 
and in many cases impossible, to determine which insect is under dis- 
cussion. Frequently in the same article the three well-marked species 
are described as if they were identical. Owing to this confusion American 
writers have, until recent years, failed to correctly identify the species 
under discussion, and the literature is in a sadly confused state. In 
order to clarify the situation, the following synonymical bibliography 
should be of considerable value: 
1773 Aphis pomi De Geer, Mém. 3:58, pl. 3, figs. 18-21. 
1775 Aphis mali Fabricius, Syst. Ent., p. 737, no. 19. 
1794 Aphis mali Fabricius, Ent. Syst. 4:216, no. 29. 
1802 Aphis pomi Vallot, Cone. Syst. Ouvr. Réaumur, p. 95. 
1803. Aphis mali Fabricius, Syst. Rhyng., p. 298, no. 29. 
1837 Aphis pyri mali Schmidberger, KGllar’s Ins. Inj. Gard., For., and Farmers. 
1843 Aphis mali Kaltenbach, Mon. Fam. Pflanzenlause, p. 72. 
1850 Aphis mali (in part) Walker, Ann. and Mag. Nat. Hist. 2:5:269. 
1851 Aphis mali (in part) Fitch, Cat. Ins. Cab. Nat. Hist., p. 65. 
1855 Aphis mali (in part) Fitch, Trans. N. Y. State Agr. Soc. 14:753. 
1856 Aphis mali Fitch, Trans. N. Y. State Agr. Soc. 16:333. 
1857 Aphis mali Koch, Die Pflanzenlause, p. 107. 
1863 Aphis mali Passeirni, Aphidae Ital. 
1868 Aphis mali Walker, The Zoologist, p. 1297. 
1871 Aphis mali Taschenberg, Ent. f. Gartner und Gartenfreunde, p. 465466. 
1879 Aphis mali (in part) Buckton, Mon. Brit. Aphides 2: 44-50. 
1880 Aphis mali Taschenberg, Prakt. Ins. Kunde, pt. 5:53-55. 
1887 Aphis mali (in part) Oestlund, Syn. Aphididae Minn., p. 64. 
1900 Aphis mali Smith, N. J. Agr. Exp. Sta., Bul. 143. 
1900 Aphis mali Smith, Ent. News 11:448. 
1901. Aphis padi Sanderson, Del. Agr. Exp. Sta., Ann. Rept. 12: 191-192, 
1902 Aphis pomi Sanderson, Del. Agr. Exp. Sta., Ann. Rept. 13: 1380-136. 
1904 Aphis mali Pergande, U.S. Div. Ent., Bul. 44:5. 
