ne.

1955b. A hybrid woodpecker and its significance in speciation in the
genus _Dendrocopos_. Evolution, 9:317-321, September.

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