Tyrant-flycatchers (Tyrannidae)

Yellow-bellied Tyrannulet (Ornithion semiflavum) - HBW 9, p. 274

French: Tyranneau à ventre jaune German: Gelbbauch-Kleintyrann Spanish: Mosquerito Ventriamarillo

Taxonomy: Tyrannulus semiflavus P. L. Sclater and Salvin, 1860, Choctum, Alta Verapaz, Guatemala.
Formerly placed in a separate genus, Microtriccus, together with O. brunneicapillus. The two form a superspecies; previously considered conspecific, but now split by most authors on basis of plumage, voice and habitat, also no apparent intergradation where ranges come together in Costa Rica. Monotypic.

Distribution: S Mexico (Veracruz, Tabasco, Chiapas), Guatemala, Belize, Honduras, Nicaragua and Pacific slope of Costa Rica and W Panama (W Chiriquí).