1926] Swarth: Birds and Mammals from the Atlin Region 129 



body coloration, but the former is slightly darker colored as a rule. 

 Corormta has a heavier bill than the white-crowned sparrows, and this 

 character is apparent in the young' birds. 



The accompanying illustration (pi. 4) was made from studies of 

 the freshly killed bird. The yellowish tinge to the lower parts, as there 

 shown, is an evanescent color that soon disappears from the study skin. 

 Color of bill and feet in the picture is, of course, as those parts were 

 in the living bird. 



On September 5 I made my last climb to the summit of Monarch 

 Mountain, and on that day but a single golden-crowned sparrow was 

 noted, the last for the season. 



In all, I collected six specimens of the golden-crowned sparrow 

 (nos. 44822-44827), as follows: one adult female (with the first set 

 of eggs), two males in juvenal plumage, and three birds in various 

 stages of the post- juvenal molt. 



Spizella monticola ochracea Brewster. Western Tree Sparrow 



An abundant summer visitant in the region at an altitude higher 

 than the town of Atlin. Tree sparrows may appear in the lowlands 

 upon their advent in the spring, but when we arrived, at the end of 

 May, they were already established on their nesting ground and we 

 saw none in the valley. We found them in abundance at the head of 

 Canon Creek (from 3500 to 4500 feet altitude) and in somewhat 

 similar surroundings at the same elevation on upper Otter Creek. In 

 each place they occurred where willow is the prevailing tree growth, 

 ranging in size from scrubby, mat-like thickets that can be walked 

 over, to tangled bushes ten feet high or more. The tree sparrows were 

 practically always found in or about the willows. 



On June 30 tree sparrows appeared to be carrying food to young 

 in the nest ; by the last week in July the young were going through the 

 post- juvenal molt. During September a few migrating tree sparrows 

 appeared in the lowlands. Single birds were seen at Lake Teslin, 

 September 12, and near Atlin on September 19 and 21. Eleven 

 specimens were collected (nos. 44828-44838), two adult females in 

 worn breeding plumage, eight young (July 30 to August 6) in various 

 stages of the post- juvenal molt, and one immature female in first 

 winter plumage. 



