2l6 UNIVERSITY OF COLORADO STUDIES 



leaves, October 13-21 (4 records). Gale found many sets of eggs between June 

 16 and July 9, one at about 11,000 feet. 



Dendroica striata, Black-poll Warbler (661) 



Henderson saw one at Boulder, May 7, 1905, with full opportunity to study it 

 at short range. It is rare in Colorado. 



Dendroica townsendi, Townsend's Warbler (668) 



Migrant ; rather common in the fall migration. It has been noted from the 

 edge of the Plains to about 10,500 feet. Arrives, August 28 — September 5 (4 

 records) ; the latest fall date is October 3. It has not been recorded in the spring 

 though it probably passes through the county at that time, as Chapman gives 

 May n as a date for arrival at Loveland (just north of the county). 



[Seiurus aurocapillus, Oven-bird (674)] 



Minot believed he heard the notes of this species at Boulder and Nederland 

 in 1880. It is rare in Colorado. 



Seiurus novoboracensis nolabilis, Grinnell's Water-thrush (675a) 



Minot observed it at Boulder and Nederland in the latter part of May, 1880. 

 One was taken by Bragg at Boulder, May 14, 1904. Widmann saw one in the 

 Yellow Pine zone east of Estes Park, July 16. It may prove to be a regular 

 migrant, though it has not been seen very often in Colorado. 



Oporomis tolmiei, MacgILLTVRAy's Warbler (680) 



Summer resident ; common in the Yellow Pine and occurring in the Mountain 

 zone at least to 9,000 feet and probably in the spruce regions, as Henderson took 

 one at 10,500 feet in early September. Arrives, May 4-15 (2 records); leaves, 

 September 9 — October 1 (5 records). There is one set of five eggs in the Uni- 

 versity collection taken by Gale on June 28, 1883, on "Left Hand Creek." Chap- 

 man records a nest taken at Estes Park, June 15. 



Geothlypis trichas occidentalis, Western Yellow-throat (6810) 



Summer resident; common about the marshes of the Plains. There is one 

 record for the Yellow Pine at Estes Park where Widmann observed a male, June 

 30, at about 7,500 feet. Arrives, (April 14, earliest) May 8-20 (2 records); 

 leaves, September 10-30 (4 records). Gale found eggs twice, June 17 and 20. 



Icteria virens longicauda, Long-tailed Chat (683a) 



Summer resident; rather common along the base of the foothills, where the 

 Yellow Pine meets the Plains. Arrives, May 8-17 (3 records); leaves, August 

 25 — September 9 (2 records). No nesting dates are available. 



