586 CoLoRAuo College Publication 



County to the pinon and cedar region in the southwest corner, 

 where they were observed all through the summers of 1872-73 



Seiurus aiirocapillus. Oven-bird. 



Rare ; but one record for the County, a female with ovaries 

 well developed taken by Aiken at Ramah June 5, 1898. With 

 one exception this is the only Colorado record. 



Oporornis tolmiei. MacGillivray's Warbler. 



Summer resident; common. Arrives the first or second 

 week in May. Departs in September. 



Breeds along creek bottoms from the lowest edge of the 

 foothills and in the mountains up to above 9,000 feet. Shaw 

 found it common in Crystal Park at 8,500 feet. It is common 

 along the plains streams in the spring migration, and Aiken 

 found it at Ramah, June 6, 1898, where it was very common 

 as a migrant. 



Gcothlypis trichas occidentalis. Western Yellow-throat. 



Summer resident ; common. Arrives usually the first week 

 in May; early records are April 13, 1882, and April 17, 1907. 

 Departs in August and early September. The latest date is 

 September 17, 1897. 



Frequents the neighborhood of streams and ponds on the 

 plains and along the foothills, rarely going above 8,000 feet, 

 and breeding in datrp thickets and swampy places. Aiken took 

 a female near Bear Creek, July 25, 1897, which had an egg 

 in the ovary. He noted a pair in Manitou Park, 8,500 feet> 

 in June, 1905. 



Icteria virens longicauda. Long-tailed Chat. 



Summer resident ; common. Arrives the first week in May. 

 Leaves in September; latest date September 8, 1897. 



Breeds along the valley streams to the foothills, but does 



