7 Aves. 
Titles. 
5800 
York Zoological Socioty. Vol. 1 (I- 
504), 143 pis. and figs. New York 
(N.Y. Zool. Soc.) 1917 8vo. 51 
Begg, W. Autumn migration at 
Little Ross Lighthouse, Kirkcudbright- 
shire. Scot. Nat. Edinburgh 1917 (3- 
5). 52 
Begg, W, Siberian Chiffchaff ( Phyllo - 
scopus collybitci tristis) at Little Ross 
Lighthouse, Kirkcudbrightshire. Scot. 
Nat. Edinburgh 1917 (33). 53 
Bedchambers, T. P. Notes on the 
Mallee Fowl ( Leipoa ocellata rosinae). 
No. 2. Adelaide S. Austr. Orn. 3 1917 
(78-81) text-fig. 54 
Bergtold, W. H. A study of the in- 
cubation periods of birds. What 
determines their lengths ? (1-109). 
Denver (Kendrick- Bellamy) 1917 8vo. 
55 
Bergtold, W. H. Regurgitation in 
the Bohemian Waxwing. Auk Cam- 
bridge Mass. 34 1917 (341-342). 56 
Bergtold, W. H. The birds of 
Denver. Wilson Bull. Oberlin Ohio 29 
1917 (113-129). 57 
Berlepsch, H. Freiherr von. Wiehtige 
Beobachl ungen im Paraguavisclien Ur- 
wald. J. Ornith. Leipzig 65 Bd. ii 
1917 (5-8). 58 
Berlioz, J. Sur les variations de 
plumage chez les oiseaux. I. Etude 
de VHalcyon albicillus Cuv. et du 
Chloropsis hardtvicki Jard. et Selby. 
Rev. Fram?. d’Orn. Paris 9 1917 (173- 
174). 59 
Berry, W. A chair of economic 
ornithology. Scbt. Nat. Edinburgh 
1917 (121-135). 60 
Bickerton, W. Notes on Birds ob- 
served in Hertfordshire during the year 
1915. Watford Trans. Herts. Nat. 
Hist. Soc. 16 1917 (141-156). 61 
Bishop, S. C. and Wright, A. H. 
Note on the Passenger Pigeon. Auk 
Cambridge Mass. 34 1917 (208-209). 
62 
Blaauw, F. E. Een en ander over 
bastaarden en Kleurslagen. [Einiges 
liber Bastarde und Farbenvarietaten.J 
Ardea Leiden 6 1917 (56-61). 63 
Blaauw, F. E. Some notes on the 
BJack-facod'Ibis (Theristicus melanops). 
Avicult. Mag. London 8 1917 (146-148) 
photo. 64 
Blaauw, F. E. On the breeding of 
the Tropical Seed -Finch ( Oryzoborus 
torridus). Avicult. Mag. London 9 
1917 (40^13). 65 
Blaauw, F. E. On the breeding of 
the South African Black Duck ( Anas 
sparsa). Ibis London 1917 (69-71) 
1 pi. 66 
Blaauw, F. E. vide Phillips. 
Blagg, E. W. H. A blue-grey 
variety of the Rook. Avicult. Mag. 
London 8 1917 (178-179). 67 
Blakeslee, A. F. vide Harris. 
Boase, H. Observations on some 
habits of the Coot. Scot. Nat. Edin- 
burgh 1917 (59-64). 68 
Bolam, G. Jottings from the east 
nook of Cumberland. Vasculum 
Hexham 3 1917 (40-^4). 69 
Bolam, G. Notes on the winter of 
1916-17 in the Alston district. Vas- 
culum Hexham 3 1917 (78-82 1 10-114). 
70 
Boring, A. M. and Pearl, R. Sex 
studies. IX. Interstitial cells in the 
reproductive organs of the chicken. 
Anat. Rec. Philadelphia 13 1917 (253- 
268) 6 figs. 71 
Bouet et Millet-Horsin. Liste des 
oiseaux recueillis ou observes a la Cote 
d’Ivoire en 1906-1907 et en 1913-1914. 
Rev. Fran?,. d’Orn. Paris 9 1917 (3-6). 
72 
Bowles, J. H. Coloration of down 
in adult ducks. Auk Cambridge Mass. 
34 1917 (206-207). 73 
Bowles, J. H. Notes on the Kenni- 
cott’s Screech Owl (Otus asio kenni- 
cotti) in the Puget Sound region. Auk 
Cambridge Mass. 34 1917 (422-427). 
74 
Bowles, J. H. The winter migration 
of 1916—17 in the Northwest. Condor 
Hollywood Cal. 19 1917 (125-129) 
2 photos. 75 
Bowles, J. II. Two new records for 
the Slate of Washington. Condor 
Hollywood Cal. 19 1917 (187). 76 
Bowdish, B. S. vide Philipp. 
Boyd, A. W. Birds of the Suez 
Canal zone and Sinai Peninsula. Ibis 
London 1917 (539-557). 77 
