Vol 'i9i8 XV ] Recent Literature. 503 



215), type locality Alabama, is proposed for the Raven of eastern U. S. 

 and southern Canada. C. c. sinuatus is limited to central U. S. and Central 

 Mexico, and C. c. clarionensis extended to include birds of extreme N. W. 

 Mexico and S. W. United States. C. c. principalis remains the form of the 

 far north. 



Oberholser, H. C. Diagnosis of a New Genus of Timaliidae. (Jour. 

 Wash. Acad. Sci., VIII, No. 12, January 19, 1918.) — Sterrhoptilus (p. 

 394), new genus based on Mixornis capitalis. 



Baker, E. C. Stuart. The Game Birds of India, Burma and Ceylon. Pt. 

 XXIII. (Jour. Bombay, Nat. Hist. Soc. XXV, No. 3, January 15, 1918.) 



Anderson, Johannes C. New Zealand Bird-song. Further Notes. 

 (Trans, and Proc. N. Z. Inst. XLIX, December 20, 1917.) — Claims a 

 similarity to human music. 



De Ferris, F. Contribution to a Study of the Cries and Songs of Birds' 

 in Relation to Music. (Bull. Inst. Gen. Psychologie, XVII, No. 4-6.) 

 [In French.] 



Colthrup, C. W. Some Observations on Birds' Songs and Calls. (Wild 

 Life X, No. 3, March 1918.) 



Mullens, W. H. Bullock's London Museum. (The Museum's Journal 

 [London], XVII, Nos. 4, 9 and 12.) — An important account of this 

 historic museum and its collections. 



Swales, B. H. The Purple Sandpiper at Cleveland, Ohio. (Occa- 

 sional Papers of the Museum of Zoology, Univ. of Mich., No. 57, June 20, 

 1918.) — September 3, 1883. 



Oberholser, H. C. The Criterion of Subspecific Intergradation in 

 Vertebrate Zoology. (Science, August 16, 1918.) — In the course of his 

 discussion the author says that the ' degree of difference principle ' so 

 strongly advocated by Dr. C. Hart Merriam " has been found unsatis- 

 factory." This statement would seem to be rather too sweeping as many 

 ornithologists of the highest standing regard as subspecies forms which 

 differ but slightly but do not intergrade, so long as their ranges are distinct. 

 In a very large number of cases too our judgment is actually based on the 

 amount and character of the difference, the intergradation being inferred. 

 As in many other evolutionary problems we shall probably ultimately 

 consider several factors in reaching a conclusion rather than try to bind 

 ourselves to one principle only (cf. p. 487). 



Publications Received. — Bailey, Florence Merriam. Birds of Glacier 

 National Park. (General Information regarding Glacier National Park 

 Season of 1918, pp. 52-64.) 



Bancroft, W. F. Directory of Officials and Organizations Concerned 

 with the Protection of Birds and Game, 1918. (U. S. Department of 

 Agriculture, Biological Survey.) 



Bangs, Outram. (1) Vertebrata from Madagascar. (Bull. Mus. 

 Comp. Zool., LXI, No. 14, pp. 489-511.) (2) Notes on the Geographical 

 Races of Tangara gyroloides. (Proc. N. E. Zool. Club, VI, pp. 73-76, 

 December 21, 1917.) 



