208 UNIVERSITY OF COLORADO STUDIES 



Pooecetes gramineus confinis, Western Vesper Sparrow (540a) 



Summer resident; common on the Plains and found to the upper limit of the 

 Yellow Pine zone. Gale took a specimen in migration on Bald Mountain at 

 11,000 feet, September 15, 1888. Arrives, April 2-23(4 records); leaves, Septem- 

 ber 24 — October 8 (4 records). 



Passerculus sandwichensis alaudinus, Western Savannah Sparrow (5426) 



Summer resident; common in the breeding season in a large grassy park at 

 Tolland, Gilpin County (9,000 feet), just south of the Boulder County line. 

 Common in migration on the Plains. Arrives, April 14 — May 8 (2 records); 

 leaves, September 28-30 (2 records). A specimen was taken on the Plains, May 

 14. The writer has seen birds on the Plains in summer which appeared to be of 

 this species but specimens were not taken. 



Ammodramus savannarum bimaculatus, Western Grasshopper Sparrow (546a) 

 Summer resident; infrequent in the meadows on the Plains. No migration 

 data available. One specimen was collected by Bragg on the plains in the summer 

 of 1903, and the writer noted several in June, July and August of 1910 and 191 1. 

 On June 1 2 one was feeding a young bird just able to fly. 



Chondestes grammacus strigatus, Western Lark Sparrow (552a) 



Summer resident ; abundant on the Plains in the dry areas. Arrives, May 5- 

 15 (7 records) ; leaves, August 12-29 (4 records). Gale found a nest with eggs on 

 the Plains, June 3. 



Zonolrichia querula, Harris's Sparrow (553) 



An immature female was taken by the writer on the Plains near Boulder, 

 November 5, 191 2. It is infrequent in the state, though probably of regular 

 occurrence as a fall migrant. 



Zonotrichia leucophrys leucophrys, White-crowned Sparrow (554) 



Summer resident; abundant in the grassy parks from the upper part of the 

 Yellow Pine zone to a little above timberline. It is the characteristic bird of the 

 mountain meadows and at Tolland (9,000 feet), in early June, its song is the 

 dominant one in the morning chorus. Arrives, April 24-28 (4 records) ; leaves, 

 September 30 — October 22 (3 records). It has been noted on the Plains as late 

 as June 2-8 in the spring. Gale mentioned seeing birds on December 13 but he 

 apparently did not separate the White-crowned and the Gambel's Sparrows, the 

 latter of which has since been found wintering. Gale found many nests between 

 June 15 and July 20, and believed they nested but once. Widmann observed sing- 

 ing males in June in Estes Park (7,500 feet). 



