This document is EENY-199 (originally published as DPI Entomology Circulars 29 and 315), one of a series of Featured Creatures from the Entomology and Nematology Department, UF/IFAS Extension. Published March 2001. Revised January 2015. This document is also available on Featured Creatures website at http://entomology.ifas.ufl.edu/creatures. Please visit the EDIS website at http://edis.ifas.ufl.edu.