In Coahuila, habitats vary from those characteristic near tree-line to those of the floors of the low deserts. Because of the variety of habitats, many kinds of birds are present in the State; at least 312 living named kinds of 249 species have been recorded. Possibly another 100 species will be reported after further studies have been made there. At least 154 of the species listed in this paper probably breed in Coahuila. The bird fauna in the State includes species characteristic of eastern North America and of western North America, species that range from the Atlantic to the Pacific Ocean, and species found only, or mostly, in México.
I thank Professor E. Raymond Hall, Doctor Richard F. Johnston and Doctor Robert M. Mengel for their kind help, and Doctor Harrison B. Tordoff for first suggesting this study to me. Unless otherwise stated, the nomenclature in this paper is that of the A.O.U. Check-list Committee (1957). Catalogue numbers are those of the Museum of Natural History at the University of Kansas. In so far as known to me, all birds recorded in the literature from Coahuila are listed below. In a few instances the only support for occurrence is the ascription of a given kind to Coahuila (without mention of date, catalogue number, or precise locality) by Friedmann, Griscom, and Moore (1950), and/or the A.O.U. Check-list Committee (1957); when this is so the entire entry is inclosed within brackets. In the accounts beyond, an asterisk indicates that the kind breeds in Coahuila; two asterisks indicate probable breeding in the State.
LIST OF COLLECTORS
Persons who have obtained specimens of birds from Coahuila for the Museum of Natural History are as follows:
| Albert A. Alcorn | John William Hardy |
| Joseph Raymond Alcorn | Gerd H. Heinrich |
| Sydney Anderson | William McKee Lynn |
| Rollin Harold Baker | Jack M. Mohler |
| James Sheldon Carey | Roger O. Olmstead |
| Peter Stanley Chrapliwy | Robert Lewis Packard |
| W. Kim Clark | Robert Julian Russell |
| Robert William Dickerman | William J. Schaldach, Jr. |
| John R. Esther | Harrison Bruce Tordoff |
| James Smith Findley | South Van Hoose, Jr. |
| John Keever Greer | Olin Lawrence Webb |
GAZETTEER OF LOCALITIES IN COAHUILA
The following place-names were used to record the localities of Coahuilan birds now specimens in the University of Kansas Museum of Natural History. Each place-name is followed by its location in degrees and minutes of latitude and longitude, respectively.
| Acebuches.—28°17′, 102°56′. | Múzquiz.—27°53′, 101°32′. |
| Americanos.—27°12′, 103°14′. | Nava.—28°25′, 100°46′. |
| Australia.—26°18′, 102°18′. | Ocampo.—27°22′, 102°26′. |
| Bella Unión.—25°26′, 100°51′. | Paila.—25°38′, 102°09′. |
| Boquillas.—29°11′, 102°55′. | Parras.—25°25′, 102°12′. |
| Castillón.—28°21′, 103°33′. | Piedras Blanca.—29°02′, 102°33′. |
| Cuatro Ciénegas.—26°58′, 102°04′. | Piedras Negras.—28°43′, 100°32′. |
| Diamante.—25°22′, 100°54′. | Sabinas.—27°52′, 101°07′. |
| Don Martin.—27°32′, 100°37′. | Saltillo.—25°26′, 101°00′. |
| Fortín.—28°48′, 101°41′. | San Antonio de las Alazanas.—25°16′, 100°37′. |
| General Cepeda.—25°22′, 101°28′. | San Buenaventura.—27°06′, 101°32′. |
| Gómez Farías.—24°58′, 101°02′. | San Francisco.—27°37′, 102°37′. |
| Hermanas.—27°13′, 101°13′. | San Gerónimo.—28°30′, 101°48′. |
| Iglesias.—27°34′, 101°20′. | San Isidro.—27°33′, 102°27′. |
| Jaco.—27°50′, 103°55′. | San Juan de Sabinas.—27°55′, 101°17′. |
| Jiménez.—29°04′, 100°42′. | San Lorenzo.—25°28′, 102°12′. |
| La Babia.—28°33′, 102°03′. | San Marcos.—26°41′, 102°07′. |
| La Gacha.—28°09′, 101°31′. | San Miguel.—29°14′, 101°22′. |
| La Mariposa.—28°12′, 101°49′. | San Pedro de las Colonias (San Pedro).—25°45′, 102°58′. |
| La Ventura.—24°48′, 100°38′. | Santa Teresa.—26°27′, 101°21′. |
| Las Delicias.—26°10′, 102°49′. | Tanque Alvarez.—27°56′, 102°38′. |
| Las Margaritas.—28°42′, 101°14′. | Torreón.—25°33′, 103°27′. |
| Mesa de Tablas.—25°14′, 100°24′. | Villa Acuña.—29°19′, 100°56′. |
For mountain ranges, the approximate center of the highland of each range is used as the point of reference.
| Pico de Jimulco.—25°08′, 103°16′. | Sierra de Guadalupe.—25°13′, 101°32′. |
| Sierra del Carmen.—29°00′, 102°30′. | Sierra del Pino.—28°15′, 103°03′. |
| Sierra de la Encantada.—28°25′, 102°30′. | Sierra de la Madera.—27°03′, 102°30′. |