Thomas Sinclair (ca 1805-1881) of Philadelphia produced this chromolithographic print of "Ericornis melanura [Gray] adult and Scytalopus fuscus [Gould],” now "Chilia melanura" (Crag chilia), and "Scytalopus fuscus" (Dusky tapaculo), from an original illustration by William Dreser (ca 1820, fl. 1849-1860). The image was published as Plate XXI in Volume 2, following page 188 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.