Size
In the subspecies G. c. coccinea, confined to the Atlantic coast, males are 5.7-6.2 mm long, and females 6.7-7.3 mm. In the inland subspecies, G. c. quadrivittata, males are 6.6-7.6 mm and females are 7.2-8.4 mm.
See Also
G. picta and G. fennahi are more green than red (at most, equally marked green and red) whereas G. coccinea is usually dominantly red. G. constricta, known only from Arkansas, western Mississippi, and eastern Texas, is similar to G. coccinea but is smaller (6.2-7.4 mm). [Extracted from comments by Andy Hamilton]
Internet References
live adult image [courtesy U. of Kentucky] and common name reference [Candystriped Leafhopper] (Purdue U., Indiana)
