Georgiaphis gillettei Maxson & Hottes

Forms leaf-curl galls on Ulmus americana and U. fulva (for illustration see Hottes & Frison 1931, as G. ulmi). Fundatrix and apterous fundatrigeniae are greenish blue, dusted with wax. Monoecious holocyclic on Ulmus. Alate sexuparae maturing in galls in June are greenish brown to greenish blue, wax-dusted; BL c. 1.5-1.6 mm) (Maxson & Hottes 1926). In eastern North America (Illinois, Iowa, North Carolina, Pennsylvania; BMNH collection). Synonymised with G. ulmi by Hottes & Frison (1931), but reinstated as a distinct species by Smith (1985). G. gillettei has R IV+V equal to or longer than HT II, whereas G. ulmi has R IV+V distinctly shorter than HT II.