UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 826 
Contribution from the Bureau of Entomology 
L. O. HOWARD, Chief 
Wasliington, D. C. 
PROFESSIONAL PAPER 
August 10, 1920 
GENERIC CLASSIFICATION OF THE 
HEMIPTEROUS FAMILY APHIDIDAE 
By 
A. C. BAKER, Entomologist 
Deciduous Fruit Insect Investigations 
CONTENTS 
Page 
Superfamlly Aphidoidea 2 
Phyiogenyof the Aphididae 3 
Key to the Subfamilies of the Aphididae 10 
Subfamily I, Aphidinae 10 
Tribe Lachnini 12 
Tribe Thelaxini 20 
Tribe Caiiipterini 21 
Tribe Greenideini 37 
Tribe Setaphidini 38 
Tribe Aphidini 39 
Subfamily n, Mindarinae 61 
Page 
Subfamily HI, Eriosomatinae 62 
Tribe Eriosomatini 65 
Tribe Pemphiginl 68 
Tribe Melphini 73 
Tribe Prociphilini 75 
Tribe Fordini 77 
Subfamily IV, Hormaphidinae .... 81 
Tribe Hormaphidin! 83 
Tribe Oregmini 84 
Tribe Cerataphidini 86 
Genera Not Placed 88 
WASHINGTON 
GOVERNMENT PRINTING OFFICE 
1920 
