[Photo] Colony of greenbugs with a few corn leaf aphids mixed in.

Greenbug (Schizaphis graminum)
The greenbug is lime-green colored with a darker green stripe running down the length of its back. The outer half of its antennae and tips of the legs are black, as are the tips of its cornicles (tail pipe looking projections on the rear of the aphid).

Greenbug Management Decision Support Tool http://www.ento.okstate.edu/gbweb/