Vol 'i9i9 XVI ] Blackwelder, Birds of the Upper Yukon. 63 



Passerculus sandwichensis alaudinus. Western Savannah Spar- 

 row. — Commonly associated with Pipits on the mountains twenty-five 

 miles west of Circle about the middle of July. At this season it is always 

 above timber-line. 



Zonotrichia 1. gambelli. Gambel's Sparrow. — This is the most 

 common bird along Yukon canyon and in the mountains west of Circle. 

 It became scarce about July 10, and was last seen on August 8. It prob- 

 ably migrates early. 



Spizella monticola ochracea. Western Tree Sparrow. — Common 

 near timber-line in the mountains west of Circle. 



Junco hyemalis hyemalis. Slate-colored Junco. — Common in 

 the spruce and birch timber everywhere. 



Passerella iliaca(?). Fox Sparrow. — Several were seen in the willow 

 thickets in the Birch Creek flats on August 12. 



Petrochelidon lunifrons lunifrons. Cliff Swallow. — A small 

 colony was found nesting on the limestone cliffs on the Yukon River below 

 Thanksgiving Creek. None were seen elsewhere. 



Tachycineta thalassina lepida. Northern Violet-green Swal- 

 low. — Abundant along the Yukon and locally in the mountains farther 

 west. Normally it nests among the cliffs in chinks in the rocks, but it was 

 also seen going in and out of the Bank Swallow's burrows in the silt 

 terraces along the river and was also using old mud nests of the Cliff 

 Swallows. It was last seen on August 11. 



Riparia riparia. Bank Swallow. — Nests locally in silt banks along 

 Yukon canyon. Not abundant. 



DendroBca sestiva rubiginosa. Alaska Yellow Warbler. — A few 

 were seen among the willows along the Yukon in June. 



Dendroica coronata. Myrtle Warbler. — Rather common in the 

 spruce woods along Beaver Creek in July and August. Last seen August 14. 



Seiurus noveboracensis notabilis. Grinnell's Water Thrush.— 

 A few were seen along the banks of the creeks in July and August. 



Anthus rubescens. Pipit. — Present everywhere on the mossy 

 slopes above timber-line. Seen at Fort Yukon on the Flats August 17. 



Penthestes hudsonicus hudsonicus. Hudsonian Chickadee. — 

 Common in spruce forest near the White Mountains in July and in the 

 Yukon Flats in August. 



Regulus calendula calendula. Ruby-crowned Kinglet. Common 

 in spruce forest around White Mountains in July. Last seen August 12. 



Hylocichla alicits aliciae (?). Gray-cheeked Thrush. — A thrush with 

 the peculiar wiry buzzing note of the Veery was heard rather frequently 

 along the flood plains of the Yukon River and Birch Creek, from June 10 

 to August 15. 



Hylocichla ustulata swainsoni. Olive-backed Thrush. — Very 

 common along the Yukon in June, but much less so in the mountains in 

 July. Last heard August 9. 



Planesticus migratorius migratorius. Robin. — Rather scarce hut 



