Electronic Biologia Centrali-Americana is a collaboration between the Smithsonian, Missouri Botanical and Kew Gardens, the British Natural History Museum and various other institutions which has enabled the digitizing of 58 volumes of natural history about central America produced between 1880 and 1920. It includes descriptions of more than 50,000 species with images of more than 18,000 birds, more birds, snakes, turtles, centipedes, spiders, more spiders, plants, mollusks, more plants, butterflies, orthoptera insects, more butterflies and their family's (moth-like) families, mammals and even some historic maps of the region. There is a parallel project attempting to provide access to much more scientific data and specimens between these institutions. Note: 'next' button at top +/- bottom of these large thumb pages; large high resolution jpegs work (in most cases) but zoom and .pdfiles are not yet enabled. I've only just scratched the surface.
"A natural history of birds. Most of which have not been figur'd or describ'd, and others very little known from obscure or too brief descriptions without figures, or from figures very ill design'd."  and "Birds of North America"  Samples (the last 15 from each link): : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15. : 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15. [MI]