Explanation of Names
Graphocephala coccinea (Forster 1771)
Cicada coccinea Forster, 1771
Tettigonia quadrivittata Say, 1830
G. c. coccinea (confined to the Atlantic coast): ♂♂ 5.7-6.2 mm, ♀♀ 6.7-7.3 mm
G. c. quadrivittata (inland): ♂♂ 6.6-7.6 mm, ♀♀ 7.2-8.4 mm
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 AR, w. MS & e. TX, is similar to G. coccinea but is smaller (6.2-7.4 mm). [from Andy Hamilton's comments]
Hamilton K.G.A. (1985) The Graphocephala coccinea Complex in North America (Homoptera, Auchenorryncha, Cicadellidae). Entomologische Abhandlungen 49(6): 105-11.