A fleahopper is a 1/8 inch long, yellowish-green insect. It has an elongated, oval-shaped body that is slightly flattened over the top, which is typical for most true bugs. Adult fleahoppers have a few dark spots near the rear of the upper surface of the back. Nymphs may be white to light green, small and appear to be all legs and antennae.
Source of information
J.P. Michaud (http://entomology.k-state.edu/extension/insect-information/crop-pests/cotton/fleahopper.html))
Pest photo source
JP Michaud and Phil Sloderbeck, KSU Entomology