Green-backed Goldfinch. Astragalinus psaltria hesperophilus. = Spinus psaltria hesperophilus

Date 1923
Source http://www.flickr.com/photos/biodivlibrary/7699539986
Author Allan Brooks; William Leon Dawson; Donald R Dickey; William L Finley; Wright M Pierce
Full title The birds of California : a complete, scientific and popular account of the 580 species and subspecies of birds found in the state /
BHL Page URL http://www.biodiversitylibrary.org/page/39754137
Source: https://commons.wikimedia.org/wiki/File:The_birds_of_California_(Plate_18)_(7699539986).jpg

The lesser goldfinch (Spinus psaltria) is a small songbird of the Americas. It may be the smallest true finch in the world. The lesser goldfinches range from the southwestern United States to Venezuela and Peru.