PASSERINE BIRDS OF NEW YORK 321 



Beckham, C. W. 



'87 Scarcity of adult birds in autumn 

 Auk, IV. 1887. pp. 79, 80 



Beddard, F. E. 



'92 Animal coloration 



i2mo. pp. vii, 288. London, 1892 



Reviewed by Allen, J. A., Auk, X. 1893. pp. 195-199 



Bicknell, E. P. 



'78 Evidences of the Carolinian fauna in the Lower Hudson 

 valley. Principally from observations taken at Riverdale, 

 N. Y. 

 Bull. Nutt. Orn. Club, III. 1878. pp. 128-132 



Birtwell, F. J. 



1900 The occurrence of aptosochromatism in Passerhia cyanea 

 Science, n. ser. , XL 1900. pp. 292-299 



Birtwell, F. J. 



1900 Aptosochromatism 



Pop, Sci., XXXIV. 1900. pp. 64, 65 

 Blyth, E. 



'36 Observations on the various seasonal and other external 

 changes which regularly take place in birds, more particu- 

 larly in those which occur in Britain ; with remarks on their 

 great importance in indicating the true affinities of species ; 

 and upon the natural system of arrangement 

 Loudon's Mag. Nat. Hist., IX. 1836. pp. 393-409 

 (continued with new title), pp. 505-514 

 Blyth, E. 



'37 On the reconciliation of certain apparent discrepancies ob- 

 servable in the mode in which the seasonal and progres- 

 sive changes of colour are effected in the fur of mammalians 

 and feathers of birds ; with various observations on moult- 

 ing 



Charlesworth^ s Mag. Nat. ZT/V/. (London), I. 1837. 

 pp. 259-263, 300-311 

 Bock. 



'53 Ausfallen der Mauser bei einem Vogel \Einbe7'iza lapponicci\ 

 in der Gefangenschaft 

 Journ.f. Orn., I. 1853. p. 207 

 Bock. 



'53 Zu der Frage iJber die Mauser [bei Emberiza laponicc{\ 



Journ.f. Orn., I. 1853. p. i,Zt^ 

 Annals N. Y. Acad. Sci. XIII., Oct. 31, 1900 — 21. 



