North American Birds

VOLUME 70 NO2 2018

A Quarterly Journal of Ornithological Record Published by the American Birding Association. The mission of the journal is to provide a complete overview of the changing panorama of our continent’s birdlife.

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153 V O L U M E 7 0 ( 2 0 1 8 ) • N U M B E R 2 PRESUMED COLIMA x VIRGINIA'S WARBLER HYBRIDS IN TEXAS Lockwood, M. W. and B. Freeman. 2014. The Texas Ornithological Society, Handbook of Texas birds. Texas A&M Press, College Station, Texas. Newman, George A. 1979. Compositional Aspects of Breeding Avifaunas in Selected Woodlands of the Southern Guadalupe Mountains, Texas. In Biological Investigations in the Guadalupe Mountains National Park, Texas. Proc. of a Sym. held at Texas Tech University in 1975, NPS Pro - ceedings and Transactions Series Number Four. Oberholser, Harry C. 1974. The Bird Life of Texas. Austin: University of Texas Press. Olson, C. R. and T. E. Martin. 1999. Virginia's War- bler ( Oreothlypis virginiae), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology. Peterson, J. J., G. W. Lasley, K. B. Bryan, and M. W. Lockwood. 1991. Additions to the breeding avi - fauna of the Davis Mountains. Bulletin of the Texas Ornithological Society 24: 39-48. Acknowledgements The late Dr. Wesley Lanyon assisted with early attempts to analyze this problem by supplying comments on some of the first recordings, providing discussion of the re- sults, and producing our initial sonograms. David Hedges and David Poteet assisted with efforts to capture selected individuals for in- hand examination. We are thankful to and acknowledge the Nature Conservancy of Texas for allowing these important surveys to be conducted in the early years of the Da- vis Mountains Preserve. In particular, John Karges deserves special credit for implemen- tation and organization of that effort, begin- ning in the late 1990s. All song recordings have been deposited at the Macaulay Library, Cornell University, Ithaca, New York. All original recordings were made with a Sony CM-5000V cassette recorder using a Sennheiser shotgun mi- crophone. Birds were captured and banded under valid permits issued by Texas Parks and Wildlife Department, Austin, Texas, and the USGS Bird Banding Laboratory, Laurel, Maryland. We thank Steven W. Cardiff and Donna L. Dittmann for their critical review of this manuscript and suggestions for its improve- ment. BIBLIOGRAPHY American Ornithologists' Union. 1998. Checklist of North American birds. 7 th edition. Ornithological Union, Washington, D. C. Benson, R. C. and R. H. Wauer. 2013. Colima War- bler (Oreothlypis crissalis), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology. Bryan, K. B. and J. P. Karges. 2001. Recent bird re- cords in the Davis Mountains. Texas Birds 3(1): 40-53. Bryan, K. B., R. Moldenhauer, and D. E. Kroodsma. 1987. Geographic uniformity in songs of the Pro- thonotary Warbler. Wilson Bull., 99(3): 369-376. Curson, J., D. Quinn, and D. Beadle. 1994. Warblers of the Americas. Houghton Mifflin Co., Boston. Johnson, N. K. 1976. Breeding distribution of Nash- ville and Virginia's warblers. Auk 93: 219-230. Kroodsma, D. 2005. The Singing Life of Birds: The Art and Science of Listening to Birdsong. Houghton, Mifflin & Harcourt, Trade and Reference Pub- lishers. Lasley, G. W. and C. Sexton. 1990. Texas Region: Summer report on observations of Steve Howell and Sophie Webb in the Davis Mountains. Ameri- can Birds 44(4): 1156-1158. Pyle, P. 1997. Identification guide to North Ameri- can birds: Part 1: Columbidae to Ploceidae. Slate Creek Press, Bolinas, California. Stein, R. C. 1968. Correlations among song pattern, morphology, and distribution within the genus Vermivora (Parulidae). Beih. Vogelwelt 1: 139- 146. Tweit, R. C. 2007. Colima Warbler. Texas Breeding Bird Atlas. https://txtbba.tamu.edu/species- accounts/colima-warbler/ Wauer, R. H. 1994. A closer look: Colima Warbler. Birding 26: 250-253. Wauer, R. H. and J. D. Ligon. 1974. Distributional relations of breeding avifauna of four South- western mountain ranges. In Transactions of the Symposium on the Resources of the Chi- huahuan Desert Region – U. S. and Mexico. R. H. Wauer and D. H. Riskind, eds. National Park Service Proc. And Trans. Series No. 3: 567-578. n 18a 18b 19 Spectrogram of the song of (18a) a possible Colima X Virginia's warbler hybrid recorded along the ridge east of Mount Livermore on 25 May 2003. Cut 025-B9 by Kelly B. Bryan; and (18b) a Virginia's Warbler at the summit of Mount Livermore on 2 May 2003. Cut 023-B7 by Kelly B. Bryan. Spectrogram of the song of a Colima Warbler recorded on 12 May 2014 in the Chisos Mountains by Jerome Fisher, showing note pattern type as previously described (cut XC163951).

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