FIGURE 4 in Taxonomy and geographic variation of Formicivora serrana (Hellmayr, 1929) and Formicivora littoralis Gonzaga and Pacheco, 1990 (Aves: Passeriformes: Thamnophilidae)

FIGURE 4. Observed patterns of the character white supercilium. A. large and uninterrupted (F. s. serrana, MNRJ 27247). B. thin and uninterrupted (F. s. interposita, MNRJ 44422). C. post ocular thin and uninterrupted (F. s. littoralis, MNRJ 39171). D. thin and interrupted (MNRJ 36750—holotype of F. s. interposita). E. thin and interrupted with only a few feathers (F. s. littoralis, MNRJ 36800). F. post ocular white macula (F. s. littoralis, MNRJ 43737).