165. Simpson— Proc. Eoyal Soc. Edinburgh, Vol. XXXII, 

 part 1, No. 5, p. 19. 



166. Simpson— Proc. Eoyal Soc. Edinburgh,, Vol. XXXII, 

 part 1, No. 11, p. 10. 



167. Simpson and Galbraith — Jour. Physiology, Vol. 33, 

 p. 225. 



168. Crisp,' E.— Proc. Brit. Soc. Adv. Sci., 1864 and 1865, 

 p. 92. 



169. Wilbur, A. P., and Watts, E. A. — Personal communi- 

 cation. 



170. Post, K. C— Wilson Bull., Dec, 1916, p. 178. 



171. Wetmore, Alex. — ^U. S. Dept. Agric. Farmers Bull., 

 No. 770, p. 16. 



172. Sherman, A. E.— Wilson Bull., Dec, 1916, p. 196. 



173. Spohn and Eiddle— Am. Jour. Physiology, Vol. XLI, 

 No. 3, p. 408. 



174. Buchanan — Jour. Physiology (Cambridge), Vol. 

 XXXVIII, 1909, p. 62-66. 



175. Colo. Mus. Nat. Hist., F. C. Lincoln — Personal com- 

 munication. 



176. Evans— Birds, 1898. 



177. Oberholser— U. S. Nat. Mus. Bull. 86. 



178. Meyer— Auk, 1916, p. 82. 



179. Hitchcock— Bird-Lore, March- April, 1917, p. 79. 



180. Eaton— Birds of New York. 



181. Lanning— Wild Life in China, 1911. 



182. Colo. Mus. Nat. Hist., E. J. Niedrach — Personal com- 

 munication. 



183. Wilbur— Youth's Companion, Feb. 22, 1917, p. 111. 



184. Day— Bird-Lore, June, 1899, p. 78. 



185. Lucas— Auk, Vol. IV, p. 2. 



186. Campbell— Bird-Lore, Jan.-Feb., 1903, p. 5. 



187. Seton and Chapman — Bird-Lore, Jan.-Feb., 1904, p. 1. 

 188.- Lemmon — Bird-Lore, May-June, 1901, p. 108. 



189. Whitten— Bird-Lore, May-June, 1902, p. 95. 



190. Lemmon — Bird-Lore, May- June, 1904, p. 89. 



191. Campbell— Bird-Lore, Jan.-Feb., 1903, p. 5. 



192. Jackson— Bird-Lore, Nov.-Dec, 1903, p. 184. 



193. Moore— Bird-Lore, Sept.-Oct., 1902, p. 162. 



194. Hegner— Bird-Lore, Sept.-Oct., 1906, p. 154. 



195. Shufeldl^Auk, July, 1893, p. 304. 



196. Heil— Bird-Lore, May-June, 1908, p. 101. 



197. Heil— Bird-Lore, July-Aug., 1909, p. 158. 



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