vent being a brighter yellow. V. c. griseobarbatus (von Berlepsch & Taczanowski, 1884) – Found in west Ecuador and northwest Peru. It weighs , with a bill length of in males and in females and a wing length of . It tends to have a brighter green back than the nominate, with dark line bordering the crown and more yellow on the underparts, especially the flanks. V. c. caucae (Chapman, 1912) – Found in west Colombia, on the Pacific coast, the western slopes of the West Andes and the valleys of the upper Río Patía and Río Cauca. It looks similar to the nominate subspecies, but is darker with more grayish ear coverts. V. c. vividior Hellmayr & Seilern, 1913 – Found in Colombia, Venezuela, the Guianas, north Brazil and Trinidad. It weighs , with a bill length of and a wing length of . It has brighter yellow-green upperparts, with a relatively longer bill. V. c. solimoensis Todd, 1931 – Found in east Ecuador, northeast Peru and extreme west Brazil. It weighs , with a bill length of in males and in females and a wing length of . It is small, with a bright yellow behind, and the gray crown extending over to the hindneck. V. c. tobagensis Hellmayr, 1935 – Found in Tobago. It is a large subspecies, with a heavy bill and a darker back. V. c. diversus Zimmer, JT, 1941 – Found in east Paraguay, southeast Brazil, Uruguay and northeast Argentina. It weighs , with a wing length of . Looks similar to agilis, but has darker and duller upperparts, a brown-tinged back, and a mouse-gray on the top of the head. It is differs from chivi by having greener upperparts, flanks and sides, and a more yellow crissum (area surrounding the cloaca). V. c. pectoralis Zimmer, JT, 1941 – Found in north Peru, with a suspected population in Zamora-Chinchipe in southeastern Ecuador. Similar to griseobarbatus, but larger, with gray-tinged breast and throat and darker and duller green on the back. Description The species looks similar to the related red-eyed vireo and yellow-green vireo. It is in length, with the mass and length of the bill and wings varying in different subspecies. Hatchlings are born almost naked with yellow skin and sparse down. Juveniles have brownish or tawny (depending on subspecies) upperparts, with the greater and median coverts having brownish-green tips, and the head showing