WOOLL"^ APHIDS OF THE ELM. 279 



Hamamelistes betulae Mordwilko. (Mss. correction of Cerata- 

 phis betulae Mordwilko). Mordwilko, 1899, p. 973. 



Hamamelistes (Tetraphis) hetulina Horvath. Kirkaldy, 1906, 

 p. 17. 



Hamamelistes spinosus Shimer (Hormaphis papyraceae Oest- 

 lund). Pergande, 1901, p. 25. 



Symdobins oblongus (Heyden). Mordwilko, 1899, p. 409. 



Symdobius oblongus Heyden. Schouteden. 1906a, p. 210. 



Vacuna betulae Kalt. Kaltenbach, 1874, p. 610. 



CAR PIN US. Hornbeam. 



C. Betulus L. 



Callipterus carpini Koch. (A. coryli Kalt?). Buckton, 3, p. 19. 

 Callipteriis coryli (Goetze) Koch. Buckton, 3, p. 18. 

 Myzocallis coryli (Goetze) Pass. (A. avellanae Schrank) (C. 

 coryli Koch) (C carpini Koch). Passerini, 1863, p. 55. 



CORYLUS. Hazelnut. 



C. Avellana L. 



Callipterus carpini Koch (A. coryli Kalt.). Koch, p. 216. 



Callipterus coryli (Goetze) Koch. (Myzocallis coryli Pass.) 

 Buckton, 3, p. 18. 



Myzocallis coryli (Goetze) (Callipterus carpini Koch). Ferrari, 

 1872, p. 75. 



Myzocallis coryli (Goetze) Pass. (A. avellanae Schrank) (C. 

 coryli Koch) (C. carpini Koch). Passerini, 1863, p. 55. 



Myzus tetrarhoda Walker (Aphis) (Siphonophora rosarum 

 Koch) Ferrari, 1872, p. 61. 



Siphonophora avellanae (Schr.) Koch (coryli Mosley) Buckton, 

 I, p. 150. 



Siphonophora avellanae Koch. (A. avellanae Walker). Pas- 

 serini, 1863, p. 12. 

 C. sp. 



Callipterus (Myzocallis) coryli Goetze. Davis, 1910b, p. 417. 



OSTRYA. Hop Hornbeam. 



O. virginiana Mill. American Hop Hornbeam, Leverwood. 



Siphonophora sp. ("apparently identical with S. geranii Oest- 

 lund"). Osborn and Sirrine, 1893, p. 236. 



FAGACEAE. BEECH FAMILY. 



CASTANEA. Chestnut. 



C. dentata Marsb. Chestnut. 



Calaphis casfaneae (Fitch). Gillette, 1910, p. 368. 

 Callipterus castaneae Fitch. Thomas, 1879, p. 1T4 



