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The Auk A Quarterly Journal of Ornithology

EDITOR

JOHN A. WIENS

ASSISTANT EDITOR

JEAN FERNER

ASSOCIATE EDITORS

WALTER BOCK, HERBERT W. KALE II

VOLUME 98

PUBLISHED BY

THE AMERICAN ORNITHOLOGISTS • UNION

1981

DATES OF ISSUES OF "THE AUK"

VOL. 98, NO. 1--13 March 1981

VOL. 98, No. 2--2 June 1981

VOL. 98, NO. 3--31 July 1981

VOL. 98, No. 4--10 November 1981

CONTENTS OF VOLUME 98

NUMBER 1

Otus marshalii, A NEW SPECIES OF SCREECH-OWL FROM PERI}. John S. Weske and John W. Terborgh ....................................................... 1

BIRD COMMUNITIES ALONG A MONTANE SERE: COMMUNITY STRUCTURE AND ENERGETICS.

Kimberly G. Smith and James A. MacMahon ............................. 8

THE ROLE OF NUTRIENT RESERVES IN MALLARD REPRODUCTION. Gary L. Krapu ....... 29 PARENTAL COMPONENTS OF VARIANCE IN GROWTH RATE AND BODY SIZE OF NESTLING

EUROPEAN STARLINGS (Sturnus vulgaris) IN EASTERN PENNSYLVANIA. Robert E. Ricklefs and Susan Peters ......................................... S9

INTERHABITAT MOVEMENTS BY SANDERLINGS IN RELATION TO FORAGING PROFITABILITY AND

THE TIDAL CYCLE. Peter G. Connors, J.P. Myers, Carolyn S. W. Connors, and F. A. Pitelka .............................................. 49

CHANGES IN DIET AND BODY COMPOSITION OF CANADA GEESE BEFORE SPRING MIGRATION.

M. Robert McLandress and Dennis G. Raveling ....................... 65

SONG VARIATION WITHIN A POPULATION OF WHITE-EYED VIREOS (Vireo griseus). Richard A. Bradley ............................................. 80

DISPERSAL OF A NEOTROPICAL NUTMEG (Virola sebifera) BY BIRDS. Henry F. Howe _ _ 88

NEST SPACING, REPRODUCTIVE SUCCESS• AND BEHAVIOR OF THE GREAT BLACK-BACKED GULL (Larus marinus). Ronald G. Butler and Wayne Trivelpiece ............... 99

GOLDEN-WINGED WARBLERS AND BLUE-WINGED WARBLERS: THE RELATIVE SUCCESS OF A HABITAT SPECIALIST AND A GENERALIST. John L. Confer and Kristine Knapp ___ 108

DABBLING DUCK ACTIVITY AND FORAGING RESPONSES TO AQUATIC INVERTEBRATES. Rich- ard M. Kaminski and Harold H. Prince ............................. 115

ESTIMATION OF DISTANCE OF SINGING CONSPECIFICS BY THE CAROLINA WREN. Douglas G. Richards ................................................. 127

EXTRAMARITAL AND PAIR COPULATIONS IN THE CATTLE EGRET. Masahiro Fujioka and Satoshi Yamagishi ............................................. 134

BEHAVIOR AND ATTENDANCE PATTERNS OF THE FORK-TAILED STORM-PETREL. Theodore R. Simons ................................................ 145

IN MEMORIAM: GEORGE H. LOWERY, JR. Thomas R. Howell and John P. O'Neill ...... 159

IN MEMORIAM: WILLIAM T. mEETON. Stephen T. Emlen ................. 167

IN MEMORIAM: ALFRED M. BAILEY. Allan R. Phillips ..................... 173 SHORT COMMUNICATIONS

A Temperate Species-rich Assemblage of Migrant Frugivorous Birds. Robert Rybczynski and Donald K. Riker ................................................ 176

Sex-related Differences in Territorial Aggression by Ring-billed Gulls. Linda Kinkel Southern .... 179

Fertility of Albinistic Eggs of Mountain Bluebirds. Hugh L. Munro, Donita H. Munro, and Richard C. Rounds ............................................. 181

Black Vulture Nesting, Behavior, and Growth. Laurie A. McHargue ............... 182

Song and Territory Defense in the Red-winged Blackbird. Ken Yasukawa ............. 185

Discovery of the Nest and Eggs of the Cinereous Finch (Piezorhina cinerea), a Peruvian Endemic. Morris D. Williams ................................... 187

The Capture Efficiency of Flickers Preying on Larval Tiger Beetles. Elizabeth J. Mury Meyer ....... 189

Nocturnal Activities of Brazilian Hummingbirds and Flycatchers at Artificial Illumination. Helmut Sick and Dante Martins Teixeira ............................ 191

COMMENTARY

The Museum Tradition in Ornithology--a Response to Ricklefs. Storrs L. Olson ............. 193

Old Specimens and New Directions: a Comment. Mary C. McKitrick ................. 196

Response: It's Time for Museums and Biology Departments to Get Back Together. Robert E. Ricklefs 196

REVIEWS. Edited by Walter Bock ...................................................... 199

BREWSTER AND COUES AWARDS, 1980 ....................... 213

NOTES AND NEWS ................................. 64, 126, 144, 158

NUMBER 2

Do SHOREBIRDS COMPETE ON THEIR WINTERING GROUNDS? David C. Duffy, Natasha Arkins, and David C. Schneider ............................................................. 215

GENIC VARIABILITY AND DIFFERENTIATION IN THE GALAPAGOS FINCHES. Suh Y. Fang and James L. Patton ............................................................................ 230

THE INCIDENCE OF VAGRANT LANDBIRDS ON NOVA SCOTIAN ISLANDS. lan A. McLaren ......................................................................... 243

REPRODUCTIVE BIOLOGY OF THICK-BILLED MURRES (Uria lornvia): AN INTER-COLONY COMPARI- SON. T. R. Dirkhead and D. N. Nettleship ............................................... 258

NEST-SITE HABITAT SELECTED BY WOODLAND HAWKS IN THE CENTRAL APPALACHIANS.

Kimberly Titus and James A. Mosher .................................................. 270

THE TAXONOMY OF ROUGH-WINGED SWALLOWS (Stelgidopteryx; HIRUNDINIDAE) IN SOUTHERN CENTRAL AMERICA. F. Gary Stiles ..................................................... 282

INTRINSIC FACTORS IN THE SELECTION OF FORAGING SUBSTRATES BY PINE WARBLERS: A TEST

OF AN HYPOTHESIS. John T. Emlen and Michael J. DeJong ............................. 294 EFFECTS OF DENERVATION OF THE TRACHEO-SYRINGEAI, MUSCLES ON FREQUENCY CONTROL IN

VOCALIZATIONS IN CHICKS. Richard E. Phillips and Orlan M. Youngren ............... 299 LABORATORY STUDIES OF FORAGING IN FOUR BIRD SPECIES OF DECIDUOUS WOODLAND.

Virginia Pierce and Thomas C. Grubb, Jr .................................................. 307 FORAGING BEHAVIOR OF THE RED-COCKADED WOODPECKER IN SOUTH CAROLINA. Robert

G. Hooper and Michael R. Lennartz ............................................. 321 COURTSHIP BEHAVIOR AND REPRODUCTIVE ISOLATION BETWEEN WESTERN GREBE COLOR

MORPHS. Gary L. Nuechterlein .................................................... 335

PREY DROPPED BY HERRING GULLS (Larus argentatus) ON SOFT SEDIMENTS. Bretton W. Kent ................................................................................ 350

THE EFFECT OF STIMULUS PRESENTATION SEQUENCE ON THE RESPONSE OF RED-WINGED BLACKBIRDS IN PLAYBACK STUDIES. Eliot A. Brenowitz ............................ 355

GROWTH AND ENERGETICS OF CHICKS OF THE SOOTY TERN (Sterna fuscata) AND COMMON TERN (S. hitundo). Robert E. Ricklefs and Susan C. White ............................ 361

SHORT COMMUNICATIONS

Interaction between the Two Subspecies Groups of the Seed-Finch Sporophila angolensis in the Magdalena Valley, Colombia. Storrs L. Olson ................................................................. 379

A New Subspecies of Coppery Metaltail (Metallura theresiae) from Northern Peru. Gary R. Graves .... 382

Interspecific Song Acquisition by a White-crowned Sparrow. Luis F. Baptista and Martin L. Morton __ 383 Bigamy in a Male Mockingbird. Cheryl A. Logan and Mary Rulli ................................ 385

Male Starlings Delay Incubation to Avoid Being Cuckolded. Harry W. Power, Elizabeth Litovich, and Michael P. Lombardo ................................................................ 386

Importance of Structural Stability to Success of Mourning Dove Nests. Richard A. Coon, James D. Nichols, and H. Franklin Percival ................................................................. 389

A Muscle Biopsy Procedure for Use in Electrophoretic Studies of Birds. Myron Charles Baker .......... 392

Whooping Crane Preyed Upon by Golden Eagle. Ronald M. Windingstad, Harry E. Stiles, and Roderick C. Drewien .................................................................. 393

New Brazilian Records for the Golden Parakeet (Aratinga guarouba). David C. Oren and Edwin O. Willis ......................................................................... 394

Field Notes on Winter Flocks of the Ocellated Turkey (Agriocharis ocellata). George Sugihara and Katherine Heston ..................................................................... 396

New Southerly Record for the Macaroni Penguin (Eudyptes chrysolophus) on the Antarctic Peninsula. Nell P. Bernstein and Paul C. Ticcell ...................................................... 398

COMMENTARY. ORNITHOLOGY AND SOCIOBIOLOGY: A FORUM ................................... 400

The Ornithological Roots of Sociobiology. Stephen T. Emlen ............................................ 400

Sociobiology in Relation to Ornithology. Brian C. R. Bertram .................................... 403

Demography is a Cornerstone of Sociobiology. John W. Fitzpatrick and Glen E. Woodenden ............ 406

On Experimental Tests of Sociobiological Theory. H. Ronald PullJam .................................. 407 Sociobiology Is for the Birds. J. David Ligon ..................................... 409

Some Comments on Sociobiology. Amotz Zahavi ..................................... 412

Sociobiology as Learned from a Drab, Blue Bird. Russell P. Balda ............................ 415 On Socio-ornithology. Jerram L. Brown ........................................................... 417

Electrophoresis and Avian Genealogical Analyses. Paul W. Sherman ................ 419

Searching for Altruism in Birds. Harry W. Power ................................ 422

REVIEWS. Edited by Walter Lock ......................................... 426

NOTES AND NEWS ................ 269, 281, 298, 354

NUMBER 3

THE ECOLOGY OF SEABIRD FEEDING FLOCKS IN ALASKA. Wayne Hoffman, Dennis Heine- mann, and John A. Wiens ............................................. 437

SEXUAL SIZE DIMORPHISM AND SURVIVAL OF MALE AND FEMALE BLACKBIRDS (ICTERIDAE). William A. Searcy and Ken Yasukawa ..................................... 457

HIND LIMB MORPHOLOGY, PHYLOGENY, AND CLASSIFICATION OF THE PICIFORMES. Ed- ward V. Swierczewski and Robert J. Raikow ............................. 466

THE PHYLOGENETIC RELATIONSHIPS OF THE PICIFORMES (CLASS AVES). Sharon F. Simpson and Joel Cracraf! ............................................ 481

LACK OF DIFFERENTIAL SURVIVAL AMONG YOUNG IPSWICH SPARROWS. Howard A. Ross and lan A. McLaren .................................................... 495

OVERWINTER MORTALITY AND SEXUAL SIZE DIMORPHISM IN THE HOUSE SPARROW. Richard F. Johnston and Robert C. Fleischer ................................ 503

SONG DIALECTS, MIGRATION, AND POPULATION STRUCTURE OF PUGET SOUND WHITE-CROWNED SPARROWS. Dennis Heinemann ............................ 512

COLONIAL DEFENSE BEHAVIOR IN DOUBLE-CRESTED AND PELAGIC CORMORANTS. Douglas Siegel-Causey and George L. Hunt, Jr ............................ 522

MALE AND FEMALE PARENTAL ROLES IN THE WESTERN GULL UNDER DIFFERENT ENVIRON-

MENTAL CONDITIONS. Raymond Pierotti ........................ 532

COLONY SITE DYNAMICS AND HABITAT USE IN ATLANTIC COAST SEABIRDS. R. Michael Erwin, Joan Galli, and Joanna Burger ................................... 550

SEASONAL CHANGES IN WOODPECKER FORAGING PATTERNS. Richard N. Conner ........... 562

MOVEMENTS OF ADULT AND JUVENILE BANANAQUITS WITHIN A MORPH-RATIO CLINE. Joseph M. Tuncleric, Jr ..................................... 571

THE STRUCTURE OF WESTERN WARBLER ASSEMBLAGES: ANALYSIS OF FORAGING BEHAVIOR AND H^BIT^T SELECTION IN OREGON. MichaelL. Morrison ................... 578

ARRIVAL AND DEPARTURE FREQUENCIES OF GREAT BLUE HERONS AT TWO OREGON ESTUARINE COLONIES. Range D. Bayer ...................................... 589

SECOND-WAVE NESTING OF THE CALIFORNIA LEAST TERN: AGE COMPOSITION AND REPRODUC- TIVE SUCCESS. Barbara W. Massey and Jonathan L. Atwood ................ 596

IN MEMORIAM: LESLIE MILLS TUCK. W.A. Montevecchi ................... 606

SHORT COMMUNICATIONS

Effects of Abundant Species on the Ability of Observers to Make Accurate Counts of Birds. J. Michael Scott and Fred L. Ramsey ..................................... 610

Responsiveness of Male Swamp Sparrows to Temporal Organization of Song. William A. Searcy, Evan Balaban, Richard A. Canady, Stephen J. Clark, Steven Runfeldt, and Heather Williams _ 613

The Development of Effective Endothermy and Homeothermy by Nestling Pition Jays. L. Clark and Russell P. Balda ........................................... 615

Geographic Variation in the Juvenal Plumage of the Lesser Nighthawk (Chordeiles acutipennis). Robert W. Dickerman .......................................... 619

A Blue Bunting [Passerina (Cyanocompsa) parellina] Record for the United States from Louisiana. Steven W. Cardiff and J. V. Remsen, Jr ................. 621

Male Participation in Incubation and Brooding in the Blue Jay. Harriet Laine ......... 622

Predator Alarm Calls of Young Black-capped Chickadees. Karen M. Apel and Millicent S. Ficken ...... 624

Nest-site Tenacity and Mate Fidelity in Female-female Pairs of Ring-billed Gulls. Kit M. Kovacs and John P. Ryder .......................... 625

Near-ultraviolet Light Reception in the Mallard. John Parrish, Roger Benjamin, and Ricky Smith ..... 627

Courtship Display and Copulation Observed in a Pair of Philippine Hanging Parrots (Loriculus philip- pensis philippensis). Elisha W. Burr ............................... 629

Autumn Selection of Breeding Location by Field Sparrows. Raymond J. Adams, Jr. and Richard Brewer ............................. 629

A Probable Record of Intraspecific Egg Dumping for Sandhill Cranes. Carroll D. Littlefield ...... 631

COMMENTARIES

Freedom and Responsibility: the International Ornithological Congress. Helmut C. Mueller ............ 632

The International Ornithological Congress: a Counter View. Donald S. Farner ........................ 633

The Condor Case: an Uphill Struggle in a Downhill Crush. Frank A. Pitelka .......................... 634

Ornithology as Science. George T. Austin, Emmet R. Blake, Pierce Brodkorb, M. Ralph Browning, W. Earl Godfrey, John P. Hubbard, Guy McCaskie, Joe T. Marshall, Jr., Gale Monson, Storrs L. Olson, Henri Ouellet, Ralph S. Palmer, Allan R. Phillips, Warren M. Pulich, Mario A. Ramos, Areacleo M. Rea, and Dale A. Zimmerman .......................................................... 636

Response: In the Eye of the Beholder. Elliot J. Tramer ................................................ 638

Response: Ornithology as Science. Robert C. WhitEore ................................................ 638

Response: Ornithology and Ecology as Sciences. James A. MacMahon and Peter B. Landres .......... 639

REVIEWS. Edited by Walter Bock ...................................................................... 641

NOTES AND NEWS ...................................................................................... 531, 549

NUMBER 4

NESTING SYNCHRONY AND DISPERSION IN RED-WINGED BLACKBIRDSi IS THE HAREM COMPETI- TIVE OR COOPERATIVE? Ken Yasukawa and William A. Searcy ................................ 659

GENIC HETEROZYGOSITY IN THE WHITE-CROWNED 8PARROW: A POTENTIAL INDEX TO BOUN- DARIES BETWEEN SUBSPECIES. Kendall W. Corbin .............................................. 669

TOWARD A PHYLOGENETIC CLASSIFICATION OF THE RECENT BIRDS OF THE WORLD (CLASS AVES). Joel Cracraft .................................................................................. 681

LIMITATION IN SMALL HABITAT ISLANDS: CHANCE OR COMPETITION? Thomas E. Martin ...... 715

MOLT OF THE SPOTTED OWL. Eric D. Forsman ...................................................... 735

GEOGRAPHICAL VARIATION AND FUNCTIONS OF SONG TYPES IN WARBLERS (PARULIDAE). Donald E. Kroodsma ............................................................................................ 743

VARIATION OF BODY WEIGHT IN GAMBEL'S WHITE-CROWNED SPARROWS IN WINTER AND

SPRINGi LATITUDINAL AND PHOTOPERIODIC CORRELATES. James R. King and L. Richard Mewaldt ................................................................................................ 752

SEASONAL VARIATION IN THE FORAGING BEHAVIOR OF SOME MIGRATORY WESTERN WOOD WARBLERS. Richard L. Hutto ...................................................................... 765

EFFECTS OF SOCIAL FACILITATION AND OBSERVATIONAL LEARNING ON FEEDING BEHAVIOR OF

THE RED-WINGED BLACKBIRD ( Agelaius phoeniceus). J. Russell Mason and Russell F. Reid- inger, Jr ................................................................................................ 778

RAREFACTION, RELATIVE ABUNDANCE, AND DIVERSITY OF AVIAN COMMUNITIES. Frances C. James and Stephen Rathbun .......................................................................... 785

TIMING OF SHOREBIRD MIGRATION IN RELATION TO PREY DEPLETION. David C. Schneider and Brian A. Harrington .................................................................................. 801

USE OF EXCLOSURES IN STUDIES OF PREDATION BY SHOREBIRDS ON INTERTIDAL MUDFLATS.

Millicent L. Quatureen ................................................................................ 812 VEGETATION CHARACTERISTICS ASSOCIATED WITH ABERT'S TOWHEE NUMBERS IN RIPARIAN

HABITATS. Julie K. Meents, Bertin W. Anderson, and Robert D. Ohmart .................... 818 SHORT COMMUNICATIONS

Song Sparrow "Rules" for Feeding Nestlings. Jonathan R. Reed ........................................ 828

Consumption of Green Wheat Enhances Photostimulated Ovarian Growth in White-crowned Sparrows. Amelia O. Ettinger and James R. King .............................................................. 832

Wing- and Tail-flapping in Anhingas: a Possible Method for Drying in the Absence of Sun. Ann M. Francis .............................................................................................. 834

Male Incubation in Wilson's Plover ( Charadrius wilsonia). Peter W. Bergstrom ........................ 835

Sunbathing Vermilion-crowned Flycatchers Repulse Mates. Lawrence Kilham .......................... 839

Ingestion of Plastics by Laysan Albatross. Ted N. Pettit, Gilbert S. Grant, and G. Causey Whirtow ...... 839

Ficus ovalis Seed Predation by an Orange-chinned Parakeet (Brotogeris jugularis) in Costa Rica. Daniel H. Janzen ............................................................................................ 841

Rete Mirabile Ophthalmicum in Hawaiian Seabirds. Ted N. Pettit, G. Causey Whirtow, and Gilbert S. Grant .............................................................................................. 844

Back-crossing of a Common MEtre (Uria aalge) and a Common MEtre-Thick-billed MEtre Hybrid (U. aalge x U. lornvia). D. K. Cairns and Brad deYoung .......................................... 847

EDITORIAL

On Skepticism and Criticism in Ornithology. John A. Wiens ....... 848

P,•VIEWS. Edited by Walter Bock .......................... 850 ERRATA ..................................................................... 742

NOTES AND NEWS ....................................................... 811

INDEX TO VOLUME 98. Compiled by Jean Ferner .......................... 859

SUPPLEMENTS

PROCEEDINGS OF THE NINETY-EIGHTH STATED MEETING OF THE AMERICAN ORNITHOLOGISTS • UNION ...................................................... 1AA-23AA

RECENT LITERATURE .................... 1A-28A, 1B-26B, 1C-35C, 1D-38D

THE AUK ^ Quarterly Journal of Ornithology PUBLISHED BY THE AMERICAN ORNITHOLOGISTS' UNION

Editor: JOHN A. WIENS, Department of Biology, University of New Mexico, Albuquerque, New Mexico 87131

Assistant to the Editor: JEAN FERNER

Editorial Board: JAMES R. KING, HELMUT C. MUELLER, RICHARD L. ZusI

Associate Editors: WALTER BOCK (Reviews), HERBERT W. KALE, II (Periodical Liter- ature) -

THE AUK welcomes original reports dealing with the biology of birds, emphasizing the documentation, analysis, and interpretation of laboratory and field studies, tbeoretical or methodological developments, or reviews of existing information or ideas. Contributions are welcomed from throughout the world, but must be written in Engiisb.

SUGGESTIONS TO CONTRIBUTORS. Submit the typewritten original and two copies of tbe text, tables, illustrations, and all other material to the Editor. All typewritten material must be double-spaced on one side of numbered 8[5 x 11 incb (21V2 x 28 cm) good quality bond paper, with at least 1 inch (2V2 cm) margins. Originals typed on erasable, light weigbt, or mimeo bond will not be considered, but copies may be clear reproductions. Number pages through the Literature Cited. Avoid footnotes. The style of manuscripts should conform to general usage in recent issues. A cover page should contain the full title, a shortened version of the title (not to exceed 35 characters in length) for use as a running head, and your address at the time the research was conducted, followed by your present address, if different. The cover page should also include the name and full address of the individual to whom proof is to be sent.

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A more detailed set of instructions for contributors appeared in The Auk, Vol. 94, No. 1 (January 1977), copies of which are available from the Editor.

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No. 13. Evolutionary Trends in the Neotropical Ovenbirds and Woodhewers, by Alan Feduccia. 1973. $3.50 ($2.50).

No. 14. A Symposium on the House Sparrow (Passer domesticus) and European Tree Sparrow (P. moatanus) in North America, S. Charles Kendeigh. 1973. $6.00 ($4.50).

No. 15. Functional Anatomy and Adaptive Evolution of the Feeding Apparatus in the Hawaiian Hon, eycreeper Genus Loxops (Drepanididae), by Lawrence P. R/chards and Walter J. Back. 1973. $9.00 ($7.50).

No. 16. The Red, tailed Tropicblrd on Kure Atoll, by Robert R. Fleet. 1974. $5.50 ($4.$0).

No. 17. Comparative Behavior of the American Avocet and the Black, necked Stilt (Recurviroatrldae), by Robert Bruce Hamilton. 1975. $7.50 ($6.00).

No. 18. Breeding Biology and Behavior of the Oldsquaw (Clan•ula hyemalis L.), by Robert M. Alison. 1975. $3.50 ($2.50).

No. 19. Bird Populariaaa of Aspen Forera in Western l•orth America, by J. A. Douglas Flack. 1976. $7.50 ($6.00).

No. 20. Sexual Size Dimorphism in Hawks and Owls of North America, by Noel F. R. Snyder and James W. Wiley. 1976. $7.00 ($6.00).

No. 21. Social Organization and Behavior of the Acorn Woodpecker in Central Coastal California, by Michael H. MacRoberts and Barbara R. MacRoberts. 1976. $7.50 ($6.00).

No. 22. Maintenance Behavior and Communication in the Bro•vn Pelican, by Ralph W. Schreiber. viii + 78 pp., 38 text figures. 1977. Price $6.$0 ($$.00 to AOU members).

No. 23. Species Relationships in the Arian Genus Aimophila, by Larry L. Waft. viii + 220 pp., 17 text figures + 10 plates, long-play phono disc album. 1977. Price $12.00 ($10.$0 to AOU mem- bers).

No. 24. Land Bird Communities of Grand Bahama Island: The Structure and Dynamics of an Avifauna, by John T. Emlen. xi + 129 pp., 38 text figures, appendix. 1977. Price $9.00 ($8.00 to AOU members).

No. 25. Systematics of Smaller Asian Night Birds Based on Voice, by Joe T. Marshall. viii + $8 pp., frontispiece, 15 plates, phono disc supplement, appendices I-IlL 1978. Price $7.00 ($6.00 to AOU members).

No. 26. Ecology and Behavior of the Prairie Warbler Deadroles discolor, by Val Nolan, Jr. xx + 595 pp., color frontispiece, 42 text figures, 8 appendices. 1978. Price $29.50.

No. 27. Ecology and Evolution of Lek Mating Behavior in the Long-tailed Hermit Hum- mingbird, by F. Gary Stiles and Larry L. Wolf. viii + 78 pp., 26 text figures. 1979. Price $8.50 ($7.50 to AOU members).

No. 28. The Foraging Behavior of Mountain Bluebirds •vith Emphasis on Sexual Foraging Differences, by Harry W. Power. x + 72 pp., color frontispiece, 12 text figures. 1980. Price $8.50 ($7.50 to AOU members).