Rhodospiza obsoleta -- Desert Finch. Alternate name on piece: Erythrospiza obsoleta [Rosy-winged finch] Drawing on tissue. The deciduous twigs were changed to a coniferous frond, as in Gould item 2009. Artist's name(s): Gould, John; Hart, William Matthew. Originally, there were probably just 2 birds, then a rough sketch by Gould established a new pose for the second, which was added to the composition by Hart, and finally new positions were indicated by Gould.