203 
Wilson-Vickery—List of Aphidddae. 
Aphis punctipennis Zetterstedt. 
Myzocallus coryli Goeze. 
Pemphigus imhricator Fitch. 
Prociphilus tesselata Fitch. 
Rhyncholes longirostris Altum. 
Thalaxes betulina Buckton. 
Betula alba. 
Aphis comes Walker. 
Aphis impingens Walker. 
Aphis nigritarsis Heyden. 
Aphis quadrituherculata Kaltenbach. 
Calaphis betulella Walsh. 
Callipterus betulae Koch. 
Callipterus hetul'aria Kaltenbach. 
Callipterus hetulicola Kaltenbach. 
Callipterus carpini Koch. 
Callipterus tuberculata Heyden. 
Chaitophorus annulatus Koch. 
Chaitophorus betulae Buckton. 
Chaitophorus betulinus Van Der Goot. 
Chaitophorus tricolor Koch. 
Euceraphis betulae Linnaeus. 
Euceraphis betulaecolens Fitch. 
Glyphina alni Schrank. 
Hamamelistes betulae Mordwilko. 
Mamamielistes betulina Horvath. 
Hamamelistes spinosus Shimer. 
Hamamelistes tullgreni Meijere. 
Hormaphis papyraceae Oestlund. 
. Monaphis antennata Kaltenbach. 
Pterocallis minimus Van Der Goot. 
Symdobius alter Mordwilko. 
S'lpndobius oblongus Heyden. 
Vacuna betulae Kaltenbach. 
Vacuna betulina Buckton. 
♦ 
Betula alpestris, 
Hamamelistes betulae Mordwilko. 
Betula fontinalis. 
Callipterus betulae Koch. 
Callipterus betulaecolens Monell. 
Euceraphis betulaecolens Fitch. 
Euceraphis gillettei Davidson. 
Hamamelistes spinosus Shimer. 
