Warbler - British Trust for Ornithology

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Genus HIPPOLAIS Notes on Field identification icterina Icterine Warbler polyglotta Melodious Warbler pallida Olivaceous Warbler caligata Booted Warbler olivetorum Olive-tree Warbler languida Upcher's Warbler Tables of measurements Keys to genera and species Acknowledgements References Index to scientific names PLATES I. Savi's Warbler. Eric Hosking. II. Gray's Grasshopper-Warbler. Irene Neufeldt. III. Grasshopper Warbler. Eric Hosking. IV. Moustached Warbler. C. C. Doncaster. V. Sedge Warbler. Eric Hosking. VI. Great Reed-Warbler. Eric Hosking. VII. Thick-billed Warbler. Irene Neufeldt. VIII. Icterine Warbler. Eric Hosking. 53 55 57 58 61 63 64 .. 66 •. 70 75 1
INTRODUCTION THERE IS LITTLE DOUBT that the next decade will see a great change in field-ornithology in this country, and the pattern ofthis change is already becoming clear. The growing enthusiasm for serious field-work, including migration studies along lines established by bird observatories-both at permanent observatories and at new and often temporary situations pioneered by keen amateurstogether with the increasing use ofmist-nets and the development of other trapping teclmiques as an aid to bird-ringing, bring the rare bird within reach of every active worker, and invest him with a greater responsibility for correct identification than ever before. No fewer than thirty new forms were added to the British avifauna between 1947 and 1959, eleven of them of Palearctic origin-an average of one new Palearctic bird a year; and, with increasing opportunities and efficiency, there is no reason why this rate should not be continued. Species and subspecies which have occurred on only one or a few occasions will come to notice more frequently, and some which have not yet been admitted to the British List (and which are not therefore described in The Handbook ofBritish Birds or P. A. D. Hollom's more recent work) may be expected to appear. We have already reached the stage where the genus Hippolais is proving something ofan embarrassment, due to incomplete knowledge of the species characters at different seasons; and there are other genera such as Acrocephalus, Locustella and PhYlloscoPus which are equally fraught with potential headaches for the man with a mist-net or a Heligoland trap. Since the basis of all knowledge is correct identification-not only ofspecies, but ofrace, age and sex where possible-the time is ripe for a publication designed to arm the field-worker with such information, in a condensed form, as will enable him to identify in the hand the rare species and 'extra-limitals' which could conceivably come his way in the course of trapping and bird-ringing.
Page 1: y KEN ETH WILLlAMSO F.R.S.E. (Popul
Page 5: Introduction Preface to the Second
Page 10 and 11: 8 INTRODUCTION introduce difficulti
Page 16: 14 LOCUSTELLA LUSCINIOIDES Cambridg
Page 33 and 34: ACROCEPHALUS PALUDICOLA 31 Measurem
Page 35 and 36: ACROCEPHALUS BISTRIGICEPS 33 A. bis
Page 39: ACROCEPHALUS SCIRPACEUSjPALUSTRIS 3
Page 43: THE PADDYFIELD WARBLER 41 S. Russia
Page 51 and 52: ACROCEPHALUS STENTOREUS 49 ACROCEPH
Page 54: 52 ACROCEPHALUS ORINUS A. s. toxope
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58 HIPPOLAIS POLYGLOTTA Wing-formul
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- --------------- ., TABLS I-contin
Page 72 and 73:
70 USING THE KEYS Two main keys are
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KEY to the genera LOCUSTELLA and AC
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I ACKNOWLEDGEMENTS The information
Page 79 and 80:
TICEHURST, C. B. (193S). A Systemat
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THE BRITISH TRUST FOR ORNITHOLOGY T
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Warbler - British Trust for Ornithology

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