l86 UNIVERSITY OF COLORADO STUDIES 



Querquedula discors, Blue-winged Teal (140) 



Summer resident; common in migration on the lakes of the Plains. Many 

 remain late in the spring. Three broods of young ducks (about half grown on 

 August 4) and several pairs of adults were noted by the writer in the summer of 

 1912. Three birds were observed on May 30, 1910, on a mountain lake (9,000 

 feet) and Mr. Acord reported that a pair of teal had nested for three successive 

 summers at Beaver Lake (about 9,500 feet). 

 Querquedula cyanoptera, Cinnamon Teal (141) 



Migrant; from reports of hunters apparently infrequent though regular on 

 the lakes of the Plains. 

 Spatula clypeata, Shoveller (142) 



Migrant; common on the Plains. Some remain well into May. 

 Dafila acuta, Pintail (143) 



Migrant; common on the Plains. 

 Aix sponsa, Wood Duck (144) 



James Cowie and Bert Werley took three near Boulder in 1904 (Henderson) . 

 It is rare in northeastern Colorado. 

 Marila americana, Redhead (146) 



Migrant; reported as common on the Plains. 

 Marila valisineria, Canvas-back (147) 



Migrant; reported as regular though less common than the Redhead., 

 Marila affinis, Lesser Scaup Duck (149) 



Migrant ; common on the Plains lakes. 

 Clangula clangula americana, Golden-eye (151) 



Migrant; reported by hunters as rather infrequent. One in the University 

 collection was taken February 17. 

 Clangula islandka, Barrow's Golden-eye (152) 



Gale lists this species as a "summer visitant" for the mountain region and 

 states that he "saw one of the goldeneye ducks with three young ones on upper 

 lake of North St. Vrain, about ten days old," July 19, 1886. It occurs regularly 

 as a migrant at the Barr Lakes. 

 Charitonetta albeola, Buffle-head (153) 



Migrant ; reported as common on the lakes of the Plains. 

 Harelda hyemalis, Old-Squaw (154) 



Rare migrant; reported by Rowland (Henderson). One was taken by Judge 

 Park (recorded by H. G. Smith) about November 20, 1903, at Longmont; as Long- 

 mont is near the county line, the record may not belong to Boulder County. 

 The species is rare in Colorado. 



