Aphids
Aphididae
Identifications
aphids
Aphididae
Caption
Wingless adult aphid (species Sitobion avenae, the English Grain Aphid)
Contributors
University of Nebraska-Lincoln, Department of Entomology
(photographer; copyright holder)
More details: 
http://entomology.unl.edu/images/smgrains/smgrains.htm
(photographer; copyright holder)
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