Thomas Sinclair (ca 1805-1881) of Philadelphia produced this pre-press chromolithographic proof of "Euphonia refiventis [Vieill] adult male and Chlorophonia occipitalis [Du Bus] adult male," now "Euphonia rufiventris" (Rufous-bellied eupohina) and "Chlorophonia occipitalis" (Blue-crowned chlorophonia), from an original illustration by William Dreser (ca 1820, fl. 1849-1860). The image was published as Plate XX in Volume 2, following page 182 of Appendix F (Zoology-Birds) by John Cassin (1813-1869) in the report describing "The U.S. Naval Astronomical Expedition to the Southern Hemisphere during the Years 1849, 1850, 1851, and 1852" by James M. Gillis (1811-1865). The volume was printed in 1855 by A. O. P. Nicholson (1808-1876) of Washington, D.C.
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