208 The Wilson Bulletin — No. 81. 



mals to permit them to increase to tlie point where crowding must 

 inevitably result in a decreased efficiency in meeting the demands 

 of life, for in such case there is real danger to the species. 



L. J. 



A Revision of the Subspecies of the Green Heron {Butorides . 

 t-lrescens [Linnaeus]). By Harry C. Oberholser, Assistant Orni- 

 thologist, Biological Survey, Department of Agriculture. No. 1916. 

 • — From the Proceedings of the United States National Museum, 

 Vol. 42, pages 529-577. Published August 29, 1912. Washington. 



To the six previously existing forms of this heron there are 

 here added twelve subspecies, all south of the United States. In 

 addition to the study of this species, and as a necessary preliminary 

 to it, Mr. Oberholser found it necessary to determine the exact 

 status of Butorides hruneticens (Lembeye), which he concludes 

 is a good species, occurring in Cuba with the form which inhabits 

 Cuba, here newly named Butorides mrescens eubanus. The evi- 

 dent thoroughness of this revision inspires the confidence that the 

 splitting of this species of heron into subspecies is settled for 

 years to come. l. j. 



THE ORNITHOLOGICAL JOURNALS. 



The Ontario Natural Science Bulletin, No. 7, 1912. Journal of 

 the Wellington Field Naturalists' Club, Guelph, Ontario. 



The bird notes in this excellent annual are : The IJattramiaB 

 Sandpiper Breeds near Guelph, Herbert Groh ; The Yellow-breasted 

 Chat at Alma, Out., John Allan, Jr. ; Notes on the Winter Birds at 

 Guelph, Ontario, in 1911-12, E. }Y. Calvert; A. Late Migration of 

 the Evening Grosbeak in Ontario, A. B. Klugh ; A Chipping Spar- 

 row's Nest on the Ground, J. W. Noble ; A Large Colony of Bank 

 Swallows' Nests, J. W. Noble ; Spring Bird Notes from Oakville, 

 Ontario, E. W. Calvert. l. j. 



The Auk. October, 1912. Vol. XXIX, No. 4. 



The Freezing of Cayuga Lake in Its Relation to Bird Life. By 

 Alvin R. Cahn, four plates. 



The Niagara Swan Trap. By J. H. Fleming. 



Methods of Estimating the Contents of Bird Stomachs. By W. 

 L. McAtee. 



The Breeding Birds of Southern Center County. Pennsylvania. 

 Bv Richard C. Harlow. 



