6 
BIRDS OF COLORADO. 
Eastward lie the great plains, stretching 150 miles from 
Pueblo to the Kansas line and crossing the whole breadth of 
Colorado. Here is an extent of country four times as large as 
the State of Massachusetts, and in this whole region but two 
ornithologists have ever worked. Capt. P. M. Thorne was at 
Fort Lyon, on the Arkansas, and Mr. H. G. Hoskins at Bur- 
lington and vicinity, in Kit Carson County. There are four- 
teen counties in eastern Colorado that have not a single printed 
bird record to their credit. 
The great parks of Colorado have received but little more 
attention. Coues crossed North Park; Stevenson, Middle Park, 
and Allen, South Park, and took hurried glimpses at the bird 
life. San Luis Park has fared somewhat better, thanks to the 
labors of Henshaw and Aiken. Stone spent several months 
between South Park and San Luis Park, in the vicinity of 
Hancock. In southwestern Colorado, Drew in San Juan County, 
and Morrison in La Plata County, have given us valuable notes 
on the birds of the higher portions of the region. The whole 
of northwestern Colorado remains unexplored. What a field 
for the ornithologist ! As large as the whole of New England 
outside of Maine, and containing the whole valley of the Grand 
River and its tributaries, it will reward the zealous seeker with 
many Pacific forms not now known to Colorado. No other 
part of the State will probably show so large a return as the 
region around Grand Junction. Other specially favorable lo- 
calities for new developments are the lower waters of the tribu- 
taries of the San Juan River in southwestern Colorado, the 
region around Trinidad in south central Colorado, the Arkan- 
sas River near the Kansas line, and especially the Cimarron 
River of southeastern Colorado and the Platte River near Jules- 
burg in northeastern Colorado. 
For increased knowledge of distribution with regard to 
altitude, and for range during the breeding season, so little is 
known compared with what remains to be discovered that any 
part of the mountain region of Colorado offers an inviting field 
to the ornithologist. 
In addition to the mass of published data accessible to all, 
the present writer has received valuable assistance from many 
manuscript notes, and he wishes here to express his thanks to 
the correspondents who have put so much time, labor and care 
into their preparation. Much information on special points has 
been obtained in answer to direct inquiries and also the follow- 
ing lists have been received: 
A. W. Anthony. List of 226 species known by him to 
have been taken in Colorado. 
W. H. Bergtold. Notes on 20 species seen by him in 
Routt County and near Denver. 
