400 



BULLETIN OF THE 



13. Melospiza melodia. 



14. Melospiza palustris. 



15. Dolichonyx oryzivorus. 



16. Tyrannus carolinensis. 



1 7. Myiarchua crinitus. 



18. Contopus virens. 



19. Trochilus colubris. 



20. Ant- stomus vociferus. 



21. Sayornis fuscu° 



22. Cyanura cnstata. 



23. Buteo lineatus. 



24. Buteo pennsylvanicus. 



25. Accipiter Cooperi. 



26. ?Syrnium ncbulosum. 



27. Butorides virescens. 



28. Porzana Carolina. 



29. iE^ialitis vociferus. 



30. iEgialitis melodus. 



31. Philohela minor. 



32. Actiturus Bartramius. 



33. Aix sponsa. 



34. Chaulelasmus streperus. 



35. Aythya vallisneria. 



36. Hydrocbelidon fissipes. 



VI. Hudsonian Fauna. The next ornithological fauna north of 

 the Canadian may well be termed the Hudsonian Fauna. Its northern 

 limit seems to nearly coincide with the isotheral line of 50° Fahrenheit, 

 its southern limit being the isotheral of 57°, or the northern boundary 

 of the Canadian Fauna. It will include at least the southern third of 

 Labrador, the northern peninsula of Newfoundland, Anticosti Island, 

 the more elevated parts of the Height of Land separating the low- 

 lands bordering Hudson's Bay from the lowlands of the St. Lawrence 

 and the Winnipeg district, and the basin of the Mackenzie's from Lake 

 Athabasca to a point considerably north of Fort Simpson, extending in 

 the Mackenzie's River valley some distance within the Arctic Circle, 

 probably to the Arctic coast. Extending still westward, it embraces 

 the valleys of Liard's and Peel's Rivers, and probably the valley and 

 adjoining lowlands of the Youkon, including the greater part of that 

 portion of the Territory of Alaska situated to the southward of the 

 Arctic Circle. In other words, that portion of boreal America situ- 

 ated between the Canadian Fauna and the Barren Grounds. It is 

 far from certain that a western or Alaskan Fauna will not have to 

 be separated, embracing all the more temperate portions of Alaska. 

 Although strictly western species occur here, they appear to be con- 

 fined mainly to the western coast and the lower part of the Youkon 

 valley. The faunal differences between the western shore of Alaska 

 and the valley of Mackenzie's River become far greater when the 

 marine species are taken into account, even if only the birds and 

 mammalia are considered. The Pacific coasts of Alaska and Si- 

 beria have many species peculiar to the shores of those countries 



