Aldrich, J. W., and Duvall, A. J.

1958. Distribution and migration of races of the mourning dove. Condor, 60:108-128.

Amadon, D., and Eckelberry, D. R.

1955. Observations on Mexican birds. Condor, 57:65-80.

American Ornithologists' Union Check-list Committee

1957. Check-list of North American Birds. Lord Baltimore Press, Baltimore, Maryland. xiii-691 pp.

Axtell, R. W.

1954. The systematic relationships of certain lizards in two species groups of the genus Holbrookia. M. A. Thesis, Department of Zoology, Univ. Texas. 55 pp.

Axtell, R. W., and Wasserman, A. O.

1953. Interesting herpetological records from southern Texas and northern Mexico. Herpetologica, 9:1-6.

Bailey, V.

1905. Biological survey of Texas. North Amer. Fauna, 25:1-222.

Baker, R. H., and Lay, D. W.

1938. Notes on the mammals of Galveston and Mustang islands, Texas. Jour. Mammal., 19:505.

Behle, W. H., and Selander, R. K.

1953. The plumage cycle of the California gull (Larus californicus) with notes on color changes of soft parts. Auk, 70:239-260.

Blair, W. F.

1952. Mammals of the Tamaulipan Biotic Province in Texas. Texas Jour. Sci., 4:230-250.

Brown, J. L.

1958. A nesting record of the scissor-tailed flycatcher in Nuevo LeÓn, MÉxico. Condor, 60:193-194.

Coffey, B. B., Jr.

1960. Late North American spring migrants in Mexico. Auk, 77:288-297.

Davis, W. B.

1950. Summer range of the scissor-tailed flycatcher. Condor, 52:138.

Dresser, H. E.

1865-1866. Notes on the birds of southern Texas. Ibis, 1865:312-330; 446-495. Ibis, 1866:23-46.

Eisenmann, E.

1951. Northern birds summering in Panama. Wilson Bull., 62:181-185.

Goldman, E. A.

1915. Five new mammals from Mexico and Arizona. Proc. Biol. Soc. Washington, 28:133-138.

1951. Biological investigations in Mexico. Smithsonian Misc. Coll., no. 4017, 476 pp.

Goldman, E. A., and Kellogg, R. R.

1940. Ten new white-tailed deer from North and Middle America. Proc. Biol. Soc. Washington, 53:81-89.

Graber, R. R.

1955. The nighthawks of the Tamaulipas coast of MÉxico. Condor, 57:125-126.

Graber, R. R., and Graber, J. W.

1954a. Yellow-headed vulture in Tamaulipas, MÉxico. Condor, 56:165-166.

1954b. Comparative notes on Fuertes and orchard orioles. Condor, 56:274-282.

Hagar, C. N., and Packard, F. M.

1951. Checklist of the birds of the central coast of Texas. (Privately printed by the authors.)

Hall, E. R.

1951. Mammals obtained by Dr. Curt von Wedel from the barrier beach of Tamaulipas, Mexico. Univ. Kansas Publ., Mus. Nat. Hist., 5:33-47.

Hall, E. R., and Kelson, K.

1960. The mammals of North America. Ronald Press, New York. xxx + 1083 pp.

Haverschmidt, F.

1955. North American shore birds in Surinam. Condor, 57:366-368.

Hedgpeth, J. W.

1947. The Laguna Madre of Texas. Trans. Twelfth North Amer. Wildl. Conf., 364-380.

1953. An introduction to the zoogeography of the northwestern Gulf of Mexico with reference to the invertebrate fauna. Publ. Inst. Marine Sci., Univ. Texas, 3:111-224.

Hellmayr, C. E., and Conover, B.

1948. Catalogue of birds of the Americas.... Field Mus. Nat. Hist., Publ. 615, Zool. Ser., 13 (1), no. 2:vii + 434 pp.

Hildebrand, H. H.

1958. Estudios biolÓgicos preliminares sobre La Laguna Madre de Tamaulipas. Ciencia (Mex.), 17:151-173.

Kennerly, T. E., Jr.

1954. Local differentiation in the pocket gopher (Geomys personatus) in southern Texas. Texas Jour. Sci., 6:297-329.

Johnston, D. W.

1956. The annual reproductive cycle of the California gull. Condor, 58:138-162; 206-221.

Lack, D.

1954. The natural regulation of animal numbers. Clarendon Press, Oxford. viii + 343 pp.

Loetscher, F. W., Jr.

1955. North American migrants in the state of Veracruz, Mexico: a summary. Auk, 72:14-54.

Mayr, E.

1946. History of the North American bird fauna. Wilson Bull., 58:3-41.

Meyerriecks, A. J.

1960. Comparative breeding behavior of four species of North American herons. Publ. Nuttall Ornith. Club, no. 2:158 pp.

Mexican Check-list

1950. Distributional check-list of the birds of Mexico. Part I. Pac. Coast Avif., 29:202 pp.

1957. Distributional check-list of the birds of Mexico. Part. II. Pac. Coast Avif., 33:436 pp.

Orians, G. H.

1961. The ecology of blackbird (Agelaius) social systems. Ecol. Monogr., 31:285-312.

Paynter, R. A., Jr.

1955. The ornithogeography of the YucatÁn peninsula. Peabody Mus. Nat. Hist., Bull. 9:347 pp.

Peterson, R. T.

1960. A field guide to the birds of Texas. Houghton Mifflin Co., Boston. 304 pp.

Pitelka, F. A.

1950. Geographic variation and the species problem in the shore-bird genus Limnodromus. Univ. California Publ. Zool., 50:1-108.

Price, W. A.

1933. Role of diastrophism in topography of Corpus Christi area, south Texas. Bull. Amer. Assoc. Petrol. Geol., 17:907-962.

Robins, C. R., Martin, P. S., and Heed, W. B.

1951. Frigate-bird, oystercatcher, upland plover and various terns on the coast of Tamaulipas, MÉxico. Wilson Bull., 63:336.

Selander, R. K.

1958. Age determination and molt in the boat-tailed grackle. Condor, 60:355-376.

1959. Polymorphism in Mexican brown jays. Auk, 76:385-417.

Selander, R. K., and Alvarez del Toro, M.

1955. A new race of booming nighthawk from southern Mexico. Condor, 57:144-147.

Shantz, V. S.

1949. Three new races of badgers (Taxidea) from southwestern United States. Jour. Mammal., 30:301-305.

Smith, H. M.

1946. Handbook of lizards. Comstock Publ. Co., Ithaca, New York. 557 pp.

Sutton, G. M.

1950. The southern limits of the willet's continental breeding range. Condor, 52:135-136.

Taylor, J. M.

1961. Reproductive biology of the Australian bush rat Rattus assimilis. Univ. California Publ. Zool., 60:1-66.

Thompson, M. C.

1958. Semipalmated sandpiper from Tamaulipas. Wilson Bull., 70:288.

Wynne-Edwards, V. C.

1955. Low reproductive rates in birds, especially sea-birds. Acta XI Internat. Ornith. Congr., 540-547.

1959. The control of population-density through social behaviour: a hypothesis. Ibis, 101:436-441.

Transmitted March 15, 1962.

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