123. Detmers — Reptile Book. 



124. Detmers— Zoologica, Vol. I, p. 237. 



125. Detmers— Bull. N. Y. Zool. Soc, July, 1904, p. 158. 



126. Hawes and Swinnerton — Trans. Zool. Soc, London, 

 Feb., 1901. 



127. Jewett— Condor, March, 1916, p. 75. 



128. Newberry— Condor, March, 1916, p. 65. 



129. Skinner— Condor, March, 1916, p. 64. 



130. Whitaker— Ibis, 1899, p. 502. 



131. Le Souef— Ibis, 1899, p. 9. 



132. Gurney— Ibis, 1899, p. 19. 



133. Oustalet^La Nature, 1900, p. 378. 



134. Murphy, R. C. — Personal communication. 



135. Beebe— Bull. N. Y. Zool. Soc. Jan., 1906, p. 258. 



136. La Nature, July 6, 1912. 



137. Beetz and Townsand— Auk, July, 1916, p. 287. 



138. Pycraf^-History of Birds, 1914. 



139. Mills — Animal Physiology, p. 402. 



140. Curtis— Maine Agric. Exp. Station, Bull. No. 228, 

 June, 1914. 



141. Pickerel], Arizona Ostrich Farm — Personal communi- 

 cation. 



142. Bellchambers — So. Australian Ornithologist, April, 

 1916 (vide Auk, July, 1916). 



143. Menegaux — Revue Francais d'Ornith., Oct., 1915 (vide 

 Auk, Jan., 1916). 



144. Internat. Encyclop., Vol. VIII, p. 660. 



145. Ridgway — ^Man. No. Am. Birds, 4th Edition. 



146. Macdonald— Auk, Oct., 1916, p. 435. 



147. Smith, R. W. — Physiology of Domestic Animals. 



148. Howell— Text Book of Physiology, 1915. 



149. Bates— Wilson Bull., No. 96, p. 151. 



150. Gadow— Bonn's Tier. |leich, Vogel, VI. 4, p. 698. 



151. International Encyclop., Vol. I, p. 518. 



152. Phillips, Clyde and Bergtold, W. H.— Personal ob- 

 servation. 



153. Morgan — So. Australian Ornithologist, July, 1916. 



154. Beeb^-Bull. N. Y. Zool. Soc, Oct., 1908, p. 459. 



155. Encyclop. Britt., Edit. IX, Vol. XX, p. 411. 



156. Pombery — Schafer's Physiology, Vol. I, p. 785. 



157. Fuertes, Louis — Person,al communication. 



158. Mousley— Auk, July, 1916, p. 281. 



159. Beebe— Bull. N. Y. Zool. Soc, Jan., 1908, p. 397. 



160. Pickerell— U. S. Dept. Agric. Yearbook, 1905, p. 401. 



161. Hatch — Birds of Minnesota, p. 73. 



162. Heinroth— Zool. Beobachter, Vol. XLIX, No. 1, p. 14. 



163. Blaauw— Avicult. Mag., Vol. VII, No. X, 1916. 



164. Simpson— Trans. Royal Soc. Edinburgh, Vol. XL VII, 

 part 1, No. 5, p. 607. 



108 



