FAMILY APHIDAE 3 
the loan of a number of slides and the contribution of over 200 
slides of beautiful aphid mounts. N. Cholodkovsky, A. Mordvilko, 
P. van der Goot and J. M. Mimeur also contributed determined 
specimens of many European aphids. 
Former staff members here deserve major credit for laying the 
foundation and building the structure of which this work is the 
culmination. Chief of these was C. P. Gillette, the founder of the 
project, who determined the major portion of the collection and 
described many new species. C. F. Baker and J. H. Cowen served 
as early assistants in the starting of the work. L. C. Bragg, an en- 
thusiastic and tireless collector, made fully one-third of the collec- 
tion upon which this work is based. 
Former comprehensive works on aphids published by the Colo- 
rado State Agricultural Experiment Station, were first, ‘Hemiptera 
of Colorado” by Gillette and Baker, 1895, pp. 115-125, containing 60 
species described by J. H. Cowen, and “The Aphidae of Colorado” 
by Gillette and Palmer, in three parts, published in 1931, 1932, 1934, 
respectively, containing 333 species. 
The present work contains more than 100 additional species, 
thus including all which have been described from the region up to 
1950. The keys have been rewritten and improved and nomen- 
clature brought up to date as far as possible. 
Family Aphidae Samouelle* 
Aphides Linnaeus, 1758:452 (footnote). 
Aphidae Samouelle, 1819 :232. 
Aphidina Burmeister, 1835:85. 
Aphididae Passerini, 1863. 
Aphiidae Baker, 1921:101. 
CHARACTERS 
Baker 1920a:2. 
- Aphids are parasitic on plants, sap sucking and usually living 
in colonies. Sizes 1-5 mm; soft bodied and relatively slow moving. 
Adults are both alate and apterous, the antenna is four to six, usually 
six, segmented, the first two segments very short and the last seg- 
ment bearing a flagellumlike prolongation or unguis varying from 
a mere spur to a long filament; wing venation typically as shown in 
figure 1, but media of fore wing may be once-branched or simple. 
Tarsi two-segmented, the first very short, the second bearing two 
claws; cornicles are nearly always present, varying from mere pores 
to long tubes on the fifth or sixth abdominal segment; cauda present 
*This usage is in conformity with Opinion 143 rendered by the International Commis- 
sion on Zoological Nomenclature in 1943, and with the recommendations of said Com- 
mission as set forth in The Bulletin of Zoological Nomenclature, volume 4, parts 7-9, 
p. 246, 1950. This principle as applied to sub-families, tribes, and subtribes results in 
the changing of names formerly ending in aphidinae, aphidini and aphidina to aphinae, 
aphini, and aphina, and several such modifications are proposed in this paper. 
