Key to the Espírito Santo species of Fulvius (based on Carvalho & Costa 1994, and Capriles 1969)

1 Scutellum with apex whitish; body length less than 3 mm Body brown to dark brown; hemelytra with white and translucent areas; antennal segment I lighter than the other segments; II black, pale in the apical portion; mesoscutum without two patches; transverse band of corium not reaching the embolium. Male genitalia, as shown in figure 12D................ F. minimus

- Scutellum uniformly black or brown; body length greater than 3mm Body black to brown; hemelytra without translucent areas; apex of the antennal segment I and II whitish; two spots on mesoscutum; sub-basal fascia of corium reaching embolium. Male genitalia as in figure 12C.................................................................... F. bisbistillatus