UNITED STATES DEPARTMENT OF AGRICULTURE 



BULLETIN No. 826 



Contribution from the Bureau of Entomology 

 L. O. HOWARD, Chief 



J&tr^&mTL 



Washington, D. C. 



PROFESSIONAL PAPER. 



August 10, 1920 



GENERIC CLASSIFICATION OF THE HEMIPTEROUS 

 FAMILY APHIDIDAE. 1 



By A. C. Baker, 

 Entomologist, Deciduous Fruit Insect Investigations. 



CONTENTS. 



Page. 



Superfamily Aphidoidea 2 



Phylogeny of the Aphididae 3 



Key to the subfamilies of the Aphididae 10 



Subfamily I, Aphidinae 10 



Tribe Lachnini 12 



Tribe Thelaxini 20 



Tribe Callipterini '. 21 



Tribe Greenideini 37 



Tribe Setaphidini 38 



Tribe Aphidini 39 



Subfamily II, Mindarinae 61 



Subfamily III, Eriosomatinae 62 



Tribe Eriosomatini 65 



Tribe Pemphigiui 68 



Tribe Melphini 73 



Tribe Prociphilini 75 



Tribe Fordini 77 



Subfamily IV, Hormaphidinae 81 



Tribe Hormaphidini 83 



Tribe Oregmini 84 



Tribe Cerataphidini 86 



Genera not placed 88 



Probably no group of insects has received more attention at the 

 hands of economic entomologists than aphids, or plant-lice. Their 

 interesting and often complicated biologies have attracted the atten- 

 tion of investigators, not only among entomologists, but among 

 workers in the larger fields of zoology and general biology. While 

 a large amount of work on the life histories and biologies of aphids 

 has been done, corresponding progress in their classification has not 

 been made. This is probably due to several causes, such as the lack 

 of correlation of biologic and taxonomic facts, and the failure of 

 aphidologists to consider sufficiently the results of the work of others. 



On account of the great economic importance of aphids and the 

 necessity of their study in the development of control measures, the 

 lack of knowledge concerning their systematic relationships results 

 in much confusion. Some biologic workers, in fact, do not now at- 

 tempt to give the name of the species being studied on account of the 

 difficulty experienced in securing correct determinations. 



1 This paper is the first of a series treating the Aphididae. It will be followed by others dealing with 

 the economic importance, biologies, and relationships of species in the different genera. 

 141613°— 20— Bull. 826 1 



