Figure 1. Panyptila melanoleuca, Baird. White-throated Swift.
Figure 2. Chaetura vauxii, Dekay, (upper figure.) Plate XVIII, p. 35
This image was included in: Reports of Explorations and Surveys .... Volume
X. 1859. Plate XVIII. P. 35 of U. S. Pacific Railroad Explorations and Surveys
near the 35th Parallel. Call Number F593 .U58 1855 .