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 18 VOL. X NORTHWESTERN COLORADO BIRD NOTES By EDWARD R. WARREN HE last of March., 1907, the writer went to Sulphur Springs, Grand County, Colorado, for the purpose of collecting, mammals being, as usual, my spec- ialty. I remained there until May 7, collecting in that vicinity; and on that date, with Mr, J. W. Prey as assistant, I started on a week's trip to Grand Lake, 28 miles from Sulphur Springs, and farther back in the mountains. We returned to Sulphur Springs, and on the 16th of May Prey and myself started out on the route shown on the accompanying map. We had a covered wagon and pair of horses, and camp outfit, so that we were pretty independent. Altogether we drove about 650 miles, exclusive of the Grand Lake trip, and thru all sorts of country, NORTHWESTERN CORNER OF COLORADO, SHOWING RouTE TRAVERSED BY E. R. WARREN Published by permission of Clason Map Company of Denver and were at various elevations, from 5374 feet at Newcastle, to 12,000 feet and over near our Boreas Pass camp on the Continental Divide. As would be expected over such a route, there was great difference in the physical and biological characters in different portions. Sulphur Springs has an elevation of 7,665 feet, situated in the Middle Park, a rolling well-watered tract just at the west edge of the foothills of the Continental Diyide. Some of the hills are quite well timbered, especially on the north slopes, tho the trees are not large. They are mostly pines; quaking aspens are also common. There is much sage-brush in the open country. Grand Lake is more in the mountains, at an ele- vation of 8,300 feet. The lake is two or three miles long, and a mile. or more wide, with thickly timbered hills coming down to its very edge all. about. There is a small town here, and it is quite a summer resort in a small way. Going west from Sulphur Springs our route kept us mostly at the higher alii-