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Phaethornis Koepckeae, a New Species of Hummingbird from Peru
John S. Weske and John W. Terborgh

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Winter Territoriality of Townsend's Solitaires (myadestes Townsendi) in a Pinon-juniper-ponderosa Pine Ecotone
Michael G. Salomonson and Russell P. Balda

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Nesting Behavior of Herring Gulls: Invasion into Spartina Salt Marsh Area of New Jersey
Joanna Burger

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Variation and Distribution of Glaucons Gulls in Western Alaska
Carl A. Strang

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Reproductive Interactions of the Shiny Cowbird and the Yellow-shouldered Blackbird
William Post and James W. Wiley

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Local Variations in the Time of Breeding of Female Blue Grouse
Fred C. Zwickel

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Territory Quality and Mating Success in the Field Sparrow (spizella Pusilla)
Louis B. Best

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Reproductive Responses of Sparrows to a Superabundant Food Supply
Ted R. Anderson

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Songs of the Fox Sparrow. I. Structure of Song and Its Comparison with Song in Other Emberizidae
Dennis J. Martin

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Vocal Response to Predators in Pair-bonded Carolina Wrens
Eugene S. Morton and Michael D. Shalter

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A Discriminant Function Analysis of Assemblages of Fruit-eating Birds in Central America
Robert E. Ricklefs

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A Pantropical Comparison of Bird Community Structure on Six Lowland Forest Sites
David L. Pearson

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Nesting of Ferruginous Hawks (buteo Regalis) in Washington 1974-75
R. E. Fitzner, D. Berry, L. L. Boyd, and C. A. Rieck

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Nesting and Other Habits of the Bolivian Blackbird (oreopsar Bolivianus)
Gordon H. Orians, Lynn Erckmann, and John C. Schultz

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Breeding and Postnuptial Molt of the Red-vented Bulbul in Western Samoa
Andre A. Dhondt

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External Markers of Social Rank in Willow Ptarmigan
Ase Gjesdal

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News and Notes
The Condor

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Cooper Ornithological Society
The Condor

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Statement of Cash Receipts and Disbursements and Changes in Fund Balances
The Condor

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Recent Publications
The Condor

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The Bulletin Board
The Condor

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Back Matter (PDF)
The Condor

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Front Matter (PDF)
The Condor

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The Nest, Eggs, and Relationships of the Half-collared Gnatwren (microbates Cinereiventris)
Lloyd F. Kiff

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Food Habits of a White-tailed Kite Population in Central Chile
Peter L. Merserve

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Food of Nestling Tricolored Blackbirds
Frederick T. Chase and Richard W. Dehaven

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The Relation of Hunting Site Changes to Hunting Success in Green Herons and Green Kingfishers
Burr J. Betts and Donna L. Betts

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Weather-dependent Foraging Behavior of Some Birds Wintering in a Deciduous Woodland Horizontal Adjustments
Thomas C. Grubb Jr.

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Taxonomy and Range of Pionus Seniloides" in Peru"
John P. O'Neill and Theodore A. Parker III

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Serum Proteins of Canada Goose (branta Canadensis) Subspecies
Raymond F. Morgan, Shelley T. Sulkin, and Charles J. Henny

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Northern Finches Feeding from Floating Vegetation
Spencer G. Sealy