Contents
A New Genus and Species of Nine-primaried Oscine of Uncertain Affinities from Peru
George H. Lowery Jr. and Dan A. Tallman
M Iliotibialis Medialis and a Review of the M Iliotibialis Complex in Flamingos
James C. Vanden Berge
Abnormal Chicks and Pcb Residue Levels in Eggs of Colonial Birds on the Lower Great Lakes (1971-73)
Michael Gilbertson, Ralph D. Morris, and Rodger A. Hunter
A Case of Bigamy in the Florida Scrub Jay
Glen E. Woolfenden
Vocalizations of the Boreal Chickadee
Margaret A. Mclaren
Wading Bird Predation in a Seasonally Fluctuating Pond
James A. Kushlan
Cowbird Parasitism of the Cedar Waxwing and Its Evolutionary Implications
Stephen I. Rothstein
Burrowing Owls Wintering in the Oklahoma Panhandle
Kenneth O. Butts
Nesting Mortality in the Red-winged Blackbird
Donald F. Caccamise
Renesting by the Black-bellied Whistling Duck
Don Delnicki and Eric G. Bolen
Avian Populations in Herbicide Treated Brush Fields
Donald L. Beaver
Angle of Canada Goose V Flight Formation Measured by Radar
Timothy C. Williams, Thomas J. Klonowski, and Philip Berkeley
Social Organization in Ruddy and Maccoa Ducks
W. Roy Siegfried
Breeding Bird Use of a Pinyon-juniper-ponderosa Pine Ecotone
William F. Laudenslayer Jr. and Russell P. Balda
Thermal Adaptiveness of Plumage Color in Screech Owls
James A. Mosher and Charles J. Henny
In Memoriam: Charles Vaurie
Lester L. Short
Notes and News
The Auk
General Notes
Brown Noddy Incubation Shifts
William Y. Brown
Avian Nesting Success under Gamma Radiation Exposure
Richard R. Buech
Nocturnal Predation by a Black-crowned Night Heron at a Common Tern Colony
Rodger A. Hunter and Ralph D. Morris
The Affinities of the Falconid Genus Spiziapteryx
Storrs L. Olson
California Condors Soaring into Opaque Clouds
John C. Borneman
Fishing Behavior of Common Grackles
Steven J. Zottoli
Occurrences of Duck Hybrids at James Bay
R. M. Alison and J. P. Prevett
An Unusual Foraging Behavior of Tree Sparrows
Peter Goldman
Scissor-tailed Flycatcher Breeding in Southwestern Indiana
David Howell and Ed Theroff
An Addition to Two Florida Pleistocene Avifaunas
David W. Steadman
Plumage Aberrancy in Blue-winged Teal
David L. Trauger
On the Status of Buteo Nitidus in New Mexico
Dale A. Zimmerman
Western Flycatcher in Oklahoma
John S. Weske
First Breeding Records of Wilson's Phalarope for James Bay, Ontario
R. I. G. Morrison and T. H. Manning
Female Ptarmigan Reoccupying Nest Site
R. M. Alison
Covers
Front Matter
The Auk
Back Matter
The Auk