1922] Swarth: Birds and Mammals of the Stikine Region 151 



more study than we did to the fauna of the spruce belt of the interior 

 mountains, for our data are admittedly scanty; but at any rate it is 

 evident that the bird population, at least, of that region contains a 

 large proportion of forms that are characteristic of lower levels at the 

 coast. The presence of the several animal and plant species noted 

 serves for the recognition of a strip of Hudsonian zone on the mountain 



Fig. N Fig. O 



Fig. N. Ascending the mountains, the poplar woods are gradually left be- 

 hind while spruce and fir, appearing first as scattered thickets on north-facing 

 slopes or in cool canon beds, gradually become the dominant forest growths. 

 This, the Hudsonian zone, is the home of the Canada jay, pine grosbeak, golden- 

 crowned sparrow, and golden-crowned kinglet. Photograph taken in the upper 

 reaches of Telegraph Creek, looking toward the Summit, June 28, 1919. 



Fig. O. Above the spruce woods is a strip of dwarfed and prostrate balsam 

 fir; still higher, Alpine-Arctic slopes and ridges extend that are bare of trees 

 but well covered with grass, heather and moss. This timberless area is the 

 home of the mountain goat and marmot, among mammals; of white-tailed ptar- 

 migan, pallid horned lark, Hepburn rosy finch and pipit, among birds. Photo- 

 graph taken on the mountain above Doch-da-on Creek, July 23, 1919. 



sides, as distinguished from the Canadian zone of the valley below. 

 There are certain birds, apparently all of high altitudes inland, of 

 which we learned regrettably little regarding their relationship to the 

 coast fauna. They are as follows: Canachites canadensis osgoodi is 

 believed to be mainly a bird of the spruce belt on the mountains. 



