- Order: Passeriformes
- Family: Thraupidae
The Oleaginous Hemispingus is a rather dull-colored member of its genus, predominantly dull yellow below and olive-green above, with a poorly marked yellowish supercilium, although this is more obvious in the Venezuelan races, especially those farthest from the main Andean chain. In a sense, it is well named; oleaginous—having the property or appearance of oil—is derived from olive, and this species is most certainly largely olive-colored. It is most liable to be confused with one of the smaller and finer-billed Basileuterus warblers, or the Superciliaried Hemispingus (Hemispingus superciliaris), which, as its name suggests, has a much more obvious supercilium. Its habits and behavior are typical of the genus as a whole.
. 2010. Oleaginous Hemispingus (Hemispingus frontalis), Neotropical Birds Online (T. S. Schulenberg, Editor). Ithaca: Cornell Lab of Ornithology; retrieved from Neotropical Birds Online: http://neotropical.birds.cornell.edu/portal/species/overview?p_p_spp=584876