180 
BIRDS OF COLORADO. 
the collection. This bulletin therefore presents the full work of 
Mr. Carter with reference to Colorado ornithology. Many of the 
notes from his collection add nothing new to our knowledge of 
' the birds of the state, but are entered in order to make a com¬ 
plete catalogue of the species represented in the collection. 
Most of the rest of the new notes come from the further in¬ 
vestigations of Mr. C. E. Aiken, who has spent a great deal of 
time the past two years in collecting and studying the birds of 
the “ Divide” and the plains east of Colorado Springs. From his 
own collecting he has added five birds to the Colorado list, and of 
two more he has obtained the records from other persons. One 
of the excursions of Mr. Aiken deserves special mention as show¬ 
ing the possibilities of Colorado ornithology. The days from 
May 19-27, 1899, he spent in the vicinity of Limon, about a 
hundred miles out on the plains east of Colorado Springs. A 
poor place for birds one would think, and yet while there he en¬ 
countered what seemed to be a flight of eastern birds that had 
wandered from their usual course and strayed several hundred 
miles to the westward, and mingled with them some distinctively 
western species scarcely to be expected east of the mountains. 
The Red-bellied Woodpecker, Tennessee Warbler, Least Fly¬ 
catcher, Red-bellied Nuthatch, Bobolink and Scarlet Tanager 
•were rare visitants from the east found there, and in addition he 
took the Connecticut Warbler and the Canadian Warbler, both 
being the first records for Colorado. 
In contradistinction to this highly successful trip, may be 
noted one taken by the present writer, which also shows the 
peculiar distribution of bird life in Colorado. About the middle 
of May he went from Fort Collins to Grand Junction. The latter 
place is about a hundred and fifty miles fuither south and five 
hundred feet lower than Fort Collins. Vegetation was at least 
two weeks in advance of the more northern location, but bird 
migration was apparently in just the same stage ; being another 
instance of what is probably a general rule, that migration on a 
western slope is later than on an eastern. More surprising than 
this, however, was the character of the birds seen. Grand 
Junction is three hundred miles west of Fort Collins, on the 
Pacific slope and on the Grand river, that one would expect to 
find a natural highway for birds from the west and south. The 
country was quite carefully explored for twenty miles along the 
Grand and Gunnison rivers, and in all somewhat over forty 
different species of birds were identified. They were all common 
birds of the eastern slope, occurring at Fort Collins, except the 
Raven and the California Quail. The former occurs over all of 
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