BIRDS OF BOULDER COUNTY, COLORADO I 85 



Order STEGANOPODES, Totipalmate Swimmers 



Family PELECANIDAE, The Pelicans 

 Pelecanus erythrorhynchos, White Pelican (125) 



The writer saw six on a small slough on the Plains May 12, 191 2. This appears 

 to be the only definite date for the county, though hunters state that it is occasion- 

 ally seen. Reported as infrequent, though regular, at the Barr Lakes. 



Order ANSERES, Lamellirostral Swimmers 



Family ANATIDAE, The Ducks, Geese and Swans 

 Mergus americanus, Merganser (129) 



C. W. Rowland took one near Boulder on November 23, T913 (Henderson). 

 Occurs regularly as a winter resident and migrant at the Barr Lakes. 



Mergus senator, Red-breasted Merganser (130) 



Reported as a migrant by Rowland (Henderson). Reported as regular in 

 occurrence at the Barr Lakes. 



Lophodyles cucullatus, Hooded Merganser (131) 



Henderson has seen one taken in the county. Probably of regular occurrence 

 as it is "not uncommon" at the Barr Lakes. 



Anas platyrhynchos, Mallard (132) 



Migrant; common on the lakes of the Plains. There are several records for 

 late December and early January; a few individuals may occasionally remain all 

 winter. At the Barr Lakes there are many species of ducks which are indicated 

 in the present list as migrants only. In Boulder County there are no large bodies 

 of water that remain open all winter. Pierce (Kellogg, 1889) reported the mallard 

 as a summer resident at Estes Park. 



Chaulelasmus streperus, Gadwall (135) 



Migrant; common on the lakes of the Plains. Birds have been seen during the 

 last of May; one was noted by the writer on August 3; Kellogg noted a pair in 

 summer in Horseshoe Park (Estes Park). It is a resident at the Barr Lakes. 



Mareca americana, Baldpate (137) 



Migrant; reported as common on the lakes of the Plains. Some have been 

 seen as late as the latter part of May. It is common at the Barr Lakes and a few 

 breed there. 



Nettion carolinense, Green-winged Teal (139) 



Migrant; common on the lakes of the Plains. Pierce (Kellogg, 1889) reported 

 it as a summer resident at Estes Park. 



