310 BIRDS OF THE ROCKIES 



120. Double-crested cormorant. Phalacrocorax dilo- 

 PHus. Perhaps breeds in Colorado, as it breeds abundantly 

 in Utah ; all present records from eastern foothills. 



125. American white pelican. Pelecanus erythro- 

 RHYNCHOS. Once a common migrant ; a few remained to 

 breed ; now rare ; still note'd on both sides of the range. 



129. American merganser. Merganser americanus. 

 Resident ; common migrant and winter sojourner ; a few 

 breed in mountains and parks ; generally distributed in 

 North America. 



130. Red-breasted merganser. Merganser serrator. 

 Rare winter sojourner ; common migrant ; breeds far 

 north. 



131. Hooded merganser. Lophodytes cucullatus. 

 Rare resident both summer and winter ; breeds in east- 

 ern part and in the mountains ; general range, North 

 America. 



132. Mallard. Anas boschas. Very common in mi- 

 gration ; common in winter ; breeds below 9,000 feet, on 

 plains as well as in mountains ; general range, whole 

 northern hemisphere. 



134<a. Mottled duck. Anas fulvigula maculosa. Rare 

 migrant ; an eastern species, sometimes wandering west to 

 plains. 



135. Gadwall. Chaulelasmus streperus. Summer resi- 

 dent ; common in migration ; breeds on plains ; also in 

 sloughs and small lakes at an elevation of 11,000 feet in 

 southern part of State ; breeds abundantly at San Luis 

 Lakes. 



137. Baldpate. Mareca Americana. Summer resi- 

 dent ; breeds from plains to 8,000 feet. 



