Containing more than one-third of the world's bird species, the neotropical region surpasses all other zoogeographic regions in the diversity of its avian fauna. Though the exploration and cataloging stages of ornithology are now virtually complete, new species and undescribed subspecies of birds are still occasionally discovered. In this manual, Emmet R. Blake has drawn on his experience of forty-eight years in the field and laboratory to prepare a comprehensive, detailed, and authoritative synopsis of the avifauna of tropical America as now known.