Nov. 1888.] 



AND OOLOGIST. 



165 



A List of the Birds of Colorado, 



BY C'lIA.S. K. JIORIUSON. 



[All Rights Heserved.] 



29. Dnftla acnta (I.iiin). Piiiliiil. A tnui- 

 sieiit visitant piissinj; north to brwil, anil 

 winters in Ct'ntial Ainerii-a. Durinj; .July and 

 August, 1884, I found tliis spt-ciiis quite eoni- 

 nioii at I.Klie Uesniit, Wyoin, wliieii leads me to 

 believe that it breeds tlieie. Many speeit-s of 

 ducks do so, but as I was not there in time for 

 the nest and egf^s I cannot say with cerlainty. 

 Eggs six to twelve.** 



30. Aix sponsa (I.inn). Wood Uuck. I 

 found this duck at Fort Lewis, wheie it no 

 doubt breeds, altliough I found no nest. Almii- 

 dant about the liead waters of the Rio La I'lata 

 at an elevation of i),ri(IO feet. Often breeu.s far 

 from water but this is not the rule. 



3L AijlhijH (Hitcricaiia (l^^gt). Itcdlieail. 

 'I'ransient visitant; uot rare. Nests in ISritisli 

 .Vuierica, and perhaps nortlieru Montana. 



32. Aijthyn viiUisiwria (Wils). Caiivas-I)ack. 

 Reported by Antiiony as a transient visitant; 

 rare, by Breniiinger as a summer visitant. 

 Whether the last uauied gentleman has taken 

 its nest I do not know, but if it does breed it is 

 rarely, and tben only in the mountains where 

 many of the Aiidtidiv often make a vertical 

 migration to the mountain lakes to breed. 

 Such cases are not uncoiiimou with many of 

 our species. 



33. A'ltliija tiuirilii nidi-tica (Stejn). Ameri- 

 can Scaup Duck. Transient visitant; tolerably 

 common in western portion of the state. He- 

 ported from eastern Colorado by Capt. P. M. 

 Thorne, U. S. A. Breeds far north. 



34. Aythya affinis (Eyt). Lesser Scaup 

 Duck. Transient visitant; much more common 

 than tlie jirecediug, and reported from both 

 eastern and w<'stern Colorado. Like the otlier 

 it goes far north to breed but many stop in 

 Mi>ntana. It also retires farther south in 

 winter. 



35. Aythya coUaris (Douov). Ring-necked 

 Duck. Transient visitant; and I judge, rare, as 

 Drew is tlie only member upon whose list 1 find 

 it. It was observed by Chas. E. .\iken* some 

 years ago. Breeds in high northern latitudes. 



3G. Ohiiii'iiiiH'lta (iaiKjiil anii^ricaiia (Bonai)). 

 American Golden-eye. .Anthony marks this as 

 both a summer, and tiansient visitant; very 



**IJy a triinsposition of i>aragraph8 l)y the printer, 

 on page 14H of tlie October issue, tlie wrong species 

 was described under No.'iy. 



♦See Pr. Host. Soo. XV; 1872, p 310. 



abundant, by which it would seem to breed' 

 a fact not surprising although the species, as a 

 rule, goes well north to bring forth its young. 

 Its eggs have not been taken, to my knowledge, 

 in the state. 



37. Glaucionetta isUindica (Cmel). Bar- 

 row's Golden-eye. This species might almost 

 be called a resident in south-western Colorado. 

 I can record its breeding in Dolores county, and 

 have taken them all through the winter in the 

 ponds below Ft. Lewis, near what is called the 

 '• Big hill,"' on the road to Faiinington, New 

 Mexico. Anthony, however, on his list of the 

 birds near Denver marks it a transient visitant; 

 Drew's list gives it as a summer visitant, breed- 

 ing at 8.000 feet. Bunning also, in his list of 

 "Birds <if Larimer C<iunty," enters it as a sum- 

 mer visitant. 



38. CharitonHtaalhi-iila ( Linn). Buflie-head. 

 Transient visitant; common. There is every 

 reason to believe that the Bullli'-liead may be 

 found breeding in Colorado, in the mountains, 

 although I have no record of its so-doing as yet, 

 however, I think it will yet be recorded from 

 the lakes and ponds at high altitudes, as I have 

 seen them, late in April, long after the bulk 

 have passed north. 



39. HintrioHirnn histrioiiicus (Linn). Harle- 

 quin Duck. Mr. Diew reports this duck. In 

 his paper on the *" Birds of San .luan County" 

 he enters it as "common; said to breed," and 

 in his other paper,t gives it as breeding " from 

 7,000 to 10,000." For my part I believe it 

 breeds in both the San Juan and La Plata 

 counties, as I have had a duck described to me 

 by ranchmen, as breeding, which 1 can only 

 refer to this. I have often seen it through the 

 winter below Fort Lewis, on the Ute reserva- 

 tion, together with G. ishuidicd (Gmel). 1 know 

 of no eggs having been taken. 



40. Oidemia amcriaina Sw. & Rich. Am- 

 erican Scoter. Entered by Drew upon Prof. 

 Eidgvvay's authority, I know of no other re- 

 cord. 



41. KrifniKituraruhkla (Wils). Ruddy Duck. 

 Summer resident; breeds "from 7,000 to 10,000 

 feet" (Drewt). Also reported by Smith (Love- 

 land) and Capt. Thorne, U. S. -V., from eastern 

 Colorado. 



42. Chen hijperborea (Pall). Lesser Snow 

 Goose. Transient visitant, tolerably common. 

 Drew gives it at 7,500 feet in winter. 



43. Anscr alhifrons rjamhcli (Harth). Am- 



•B. N. (). C. VOL. 4. 1881. p. 142. 



tDrew on the Vertical range of Birds in Clolorado 

 AUK. Vol. II, No. 1. Jan- 1885. 



