Serpophaga is a genus of birds in the tyrant flycatcher family Tyrannidae that are found in Central and South America.
The genus contains five species: Image Scientific name Common name Distribution Serpophaga cinerea Torrent tyrannulet Costa Rica south to northern Bolivia and northwestern Venezuela. Serpophaga hypoleuca River tyrannulet Orinoco and Amazon Basin Serpophaga nigricans Sooty tyrannulet Argentina, Brazil, and Uruguay; also southern Paraguay. Serpophaga subcristata White-crested tyrannulet Argentina, Bolivia, Brazil, Paraguay, and Uruguay Serpophaga griseicapilla Straneck's tyrannulet Argentina
References
Straneck, R. 2007. Una nueva especie de Serpophaga (Aves Tyrannidae). Revista FAVE - Ciencias Veterinarias 6 (1-2): 31–42.