See also
Find flower flies information at Animal Diversity Web
Flower flies
Syrphidae
Identifications
flower flies
Syrphidae
Caption
These "worms" are actually larvae of an unknown species of Flower Fly. They are eating aphids.
Contributors
Jim Kalisch, University of Nebraska-Lincoln, Department of Entomology
(photographer; copyright holder)
More details: 
http://entomology.unl.edu/images/beneficials/flies/bene_flies.htm
(photographer; copyright holder)
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