Contents
Mount St Helens Ash: Its Impact on Breeding Ring-billed and California Gulls
James L. Hayward, Don E. Miller, and Calvin R. Hill
Patterns of Genic and Morphologic Variation among Sparrows in the Genera Zonotrichia, Melospiza, Junco, and Passerella
Robert M. Zink
Food, Predation, and Reproductive Ecology of the Dark-eyed Junco in Northern Utah
Kimberly G. Smith and Douglas C. Andersen
Sex Ratio Varies with Egg Sequence in Lesser Snow Geese
C. Davison Ankney
Notes and News
The Auk
Temperature Regulation in Two Endangered Hawaiian Honeycreepers: the Palila (psittirostra Bailleui) and the Laysan Finch (psittirostra Cantans)
Wesley W. Weathers and Charles Van Riper III
Home Ranges of Red-cockaded Woodpeckers in Coastal South Carolina
Robert G. Hooper, Lawrence J. Niles, Richard F. Harlow, and Gene W. Wood
Heritability of Egg Size, Hatch Weight, Body Weight, and Viability in Red Grouse (lagopus Lagopus Scoticus)
R. Moss and A. Watson
Spring Movements of Female Blue Grouse: Evidence for Socially Induced Delayed Breeding in Yearlings
Susan J. Hannon, Lennart G. Sopuck, and Fred C. Zwickel
Vegetation, Ground, and Frugivorous Foraging of the American Robin
Cynthia A. Paszkowski
Avian Reproduction Over an Altitudinal Gradient: Incubation Period, Hatchling Mass, and Embryonic Oxygen Consumption
Cynthia Carey, Edward L. Thompson, Carol M. Vleck, and Frances C. James
Rejection of Cowbird Eggs by Crissal Thrashers
Deborah M. Finch
Correction
The Auk
A Critique of Cracraft's Classification of Birds
Storrs L. Olson
Remarks on a World-wide Inventory of Avian Anatomical Specimens
Richard L. Zusi, D. Scott Wood, and Marion Anne Jenkinson
Book Reviews
The Auk
Index to Volume 99
The Auk
Covers
Front Matter
The Auk
Back Matter
The Auk
Short Communications
Effect of Intrusion Pressure on Territory Size in Black-chinned Hummingbirds (archilochus Alexandri)
Mary E. Norton, Peter Arcese, and Paul W. Ewald
Further Notes on the Juvenal Plumage of the Lesser Nighthawk
Robert W. Dickerman
A Note on the Occurrence of Diatoms on the Feathers of Diving Seabirds
Donald A. Croll and Robert W. Holmes
Enlarged Sex Chromosomes of Woodpeckers (piciformes)
Gerald F. Shields, Gordon H. Jarrell, and Elizabeth Redrupp
Individuality of Vocalizations in Dunlin: a Possible Acoustic Basis for Recognition of Parent by Offspring
Myron Charles Baker
Wetland Salinity and Salt Gland Size in the Redhead Aythya Americana
Stephen E. Cornelius
Occurrences of the Asiatic Marbled Murrelet [brachyramphus Marmoratus Perdix (pallas)] in North America
Spencer G. Sealy, Harry R. Carter, and Delise Alison
Notes on the Breeding of the Chestnut-bellied Heron (agamia Agami) in Venezuela
Cristina Ramo and Benjamin Busto
Nesting by One-year-old Black-crowned Night Herons on Hope Island, Rhode Island
Thomas W. Custer and William E. Davis Jr.
Records of the Crimson-collared Grosbeak (rhodothraupis Celaeno) from Texas
Michael J. Braun and Victor Emanuel
Effects of Stage of the Breeding Cycle on Sage Sparrow Detectability
Louis B. Best and Kenneth L. Petersen
Does the Woodcock Bob or Rock--and Why?
William H. Marshall
Commentaries
Variation and Nomenclature of Leach's Storm-petrels
W. R. Bourne and J. R. Jehl Jr.
The Condor Case: a Rallying Cry!
William D. Severinghaus
The Condor Case: a Continuing Plea for Realism
Frank A. Pitelka