Note 18 — Chapter IV · ACROSS THE MEXICAN MOUNTAINS TO ALTAR
Reading edition
The Cliff Swallow (Petrochelidon lunifrons) is described in Audubon's Birds of America, ed. 1840, vol. i, p. 177. Audubon proposed the name Hirundo republicana in 1824, but Say had named the species Hirundo lunifrons the year before. I am indebted to Dr. F. H. Snow for reference to the synonymy and the account of the discovery of this species in Coues's Birds of the Colorado Valley, part i, pp. 426-429.