Vol i909" VI ] Felger, Colorado Water Birds. 279 



Terns. Have seen flocks of as high as one hundred twenty-five in May and 

 flocks of from twenty to sixty in June and July. 



[120. Phalacrocorax auritus. Double-crested Cormorant. — Mi- 

 grant. (March 20-?; about October 1-November 23.) Rare in adjacent 

 and near-by localities. H. G. Smith records a flock of about twenty from 

 Sloan's Lake, one specimen from Marston's Lake, and one from Jones's 

 Lake, all near Denver. He also records one from ''about twenty miles 

 from Denver." (Auk, III, 1886, p. 284, and Nid., Ill, 1896, p. 48.) I 

 have records of one at Bowles's Lake, near Littleton; a flock of four at 

 Rocky Mountain Lake, in Denver; and one shot by H. W. Theden, of 

 Denver, on November 23, 1903, locality unknown. I have no records 

 for this area, but it doubtless has been present in this region.] 



121. Phalacrocorax vigua mexicanus. Mexican Cormorant. — Mi- 

 grant. (Only date, October 15.) Very rare. The only specimen taken 

 in Colorado is one recorded by the writer as being in his collection, it 

 having been taken at Smith's Lake, October 15, 1899. (Auk, XVIII, 1901, 

 p. 189.) This lake lies across the Platte River west of Henderson, Adams 

 County, and is, as far as the writer can determine from information at 

 hand, on the boundary line of this area. 



125. Pelecanus erythrorhynchos. American White Pelican. — Mi- 

 grant or summer resident. (About April 15-November 22.) Not com- 

 mon in migration; in summer, rare. Not known to breed, but I place it 

 as a possible summer resident from the following note: Mr. Durward 

 Luper, of Evans, Weld County, informs me that during July, 1906, there 

 was a small flock on a reservoir of 200-300 acres, which lies 3-4 miles from 

 Evans. This flock remained there for some time; just how long, or 

 whether before or after July, I do not know. Nearly every season a flock, 

 sometimes large, sometimes small, frequents the Barr Lake Chain. In the 

 spring of 1903 there was a flock of about twenty on Andre's Lake, one of 

 the Barr Lake Chain, and on May 13, 1905, I counted forty-one on Ban- 

 Lake. 



129. Mergus americanus. American Merganser. — Winter resident. 

 (Nov. 1-March 16.) Not uncommon in winter, more common in migration. 

 Quite a number remain during the winter along the South Platte River, 

 especially in localities down the river from Hardin, where there are sand 

 bars in mid-river. I have found, as Mr. Cook remarks, that the river 

 about Fort Morgan is a favorite place for them. A few frequent, during 

 the winter, lakes in which there is some open water. 



130. Mergus serrator. Red-breasted Merganser. — Winter resident. 

 (About same dates as previous species.) In migration, not uncommon; 

 in winter, uncommon. This species is never so common as the former 

 species. It may be found in about the same localities. 



131. Lophodytes cucullatus. Hooded Merganser. — Winter resident. 

 (Oct-.-April 1). In migration, common; in winter, not uncommon. A 

 few remain through the winter in same localities as American Merganser. 

 One should see from one to a dozen on almost any day in winter and early 

 spring along the Platte River between Hardin and Fort Morgan. 



