Contents
Birds Observed in the Grande Prairie -- Peace River Region of Northwestern Alberta, Canada
J. Dewey Soper
Critical Periods and Causes of Death in Avian Embryonic Development
Alexis L. Romanoff
Success of Marsh Hawk Nests in North Dakota
Merrill C. Hammond and C. J. Henry
Five New Birds from the Philippines
E. Thomas Gilliard
Twenty-fourth Supplement to the American Ornithologists' Union Check-list of North American Birds
The Auk
Notes and News
The Auk
Recent Literature
The Auk
Obituaries
The Auk
General Notes
Hummingbird Captured by Preying Mantis
Earl M. Hildebrand
Dexterous Alighting Maneuver of Passenger Pigeons
Herbert H. Beck
Hummingbird Killed by Preying Mantis
Christella Butler
Scissor - Tailed Flycatcher in Southern Louisiana in Winter
Joseph D. Biggs
Muscivora Forficata in Florida
Allan D. Cruickshank
Crested Flycatchers Nesting Some Distance from Their Foraging Area
William L. Engels
Probable Destruction of Queen Bees by Swallows
Chapman Grant
January Singing in the Black-capped Chickadee and Other Species
Louise De Kiriline Lawrence
Courtship Feeding by the Carolina Chickadee and Tufted Titmouse
Hervey Brackbill
House Wrens Feeding a Cowbird
James Hodges
Catbird's Defense Behaviorism
F. J. Freeman
Recent Emigrations of Northern Shrikes
David E. Davis
Covers
Front Matter
The Auk
Back Matter
The Auk