MILLER, A. H., FRIEDMANN, H., GRISCOM, L., and MOORE, R. T. 1957. Distributional check-list of the birds of Mexico, Pt. 2. Pacific Coast Avifauna, 33:1-436, December 20. MOORE, R. T. 1939. A review of the House Finches of the subgenus _Burrica_. Condor, 41:177-205, September-October. 1941. Three new races in the genus Otus from central Mexico. Proc. Biol. Soc. Washington, 54:151-159, November 17. 1947. New species of parrot and race of quail from Mexico. Proc. Biol. Soc. Washington, 60:27-28, April 3. MULLER, C. H. 1947. Vegetation and climate of Coahuila, Mexico. Madrono, 9:33-57, April. OBERHOLSER, H. C. 1902. A review of the larks of the genus _Otocoris_. Proc. U.S. Nat. Mus., 24(1271):801-883, June 9. 1912. A revision of the forms of the Ladder-backed Woodpecker (_Dryobates scalaris_ [Wagler]). Proc. U.S. Nat. Mus., 41(1847):139-159, May 20. 1919a. Distribution of a new Red-winged Blackbird from Texas. Wilson Bull. 31:20-23, March. 1919b. The geographic races of _Hedymeles melanocephalus_ Swainson. Auk, 36:408-416, July. 1921. A revision of the races of _Dendroica auduboni_. Ohio Jour. Sci., 21:240-248, May. PACKARD, R. L. 1957. Broad-winged Hawk in Coahuila. Wilson Bull., 69:370-371, December. PHILLIPS, A. R. 1950. The Great-tailed Grackles of the southwest. Condor, 52:78-81, March. PITELKA, F. A. 1948. Notes on the distribution and taxonomy of Mexican game birds. Condor, 50:113-123, May. RIDGWAY, R. 1901. The birds of North and Middle America. U.S. Nat. Mus., Bull. 50(Pt. I):xxxii+715 pp., October 24. 1902. _Ibid._ (Pt. II):xx+834 pp., October 16. 1904. _Ibid._ (Pt. III):xx+801 pp., December 31. 1907. _Ibid._ (Pt. IV):xxii+973 pp., July 1. 1914. _Ibid._ (Pt. VI):xx+882 pp., April 8. 1916. _Ibid._ (Pt. VII):xiv+543 pp., May 5. RIDGWAY, R., and FRIEDMANN, H. 1946. The birds of North and Middle America. U.S. Nat. Mus., Bull. 50(Pt. X):xii+484 pp., December 18. SCLATER, P. L. 1857. Review of the species of the South American subfamily Tityrinae. Proc. Zool. Soc. London, Pt. XXV, pp. 67-80. SELANDER, R. K., and BAKER, J. K. 1957. The Cave Swallow in Texas. Condor, 59:345-363, November-December. SIBLEY, C. G. 1950. Species formation in the Red-eyed Towhees of Mexico. Univ. California Publ. Zool., 50:109-194, November 24. SUTTON, G. M., and BURLEIGH, T. D. 1939a. A list of birds observed on the 1938 Semple Expedition to northeastern Mexico. Occas. Papers Mus. Zool., Louisiana State Univ., 3:15-46, April 5. 1939b. A new Screech Owl from Nuevo Leon. Auk, 56:174-175, April. VAN HOOSE, S. G. 1955. Distributional and breeding records of some birds from Coahuila. Wilson Bull., 67:302-303, December.