BIRDS OF COLORADO. 
79 
(Ridgway, Field and Forest, II. 1876-77, 195 and 208). The 
second, by C. F. Aiken, at Poncha Pass, Fremont County, June 
15, 1875, and the nest with one egg, being the first nest of this 
species known to science. (Deane, B. N. O. C. IV. 1879, 188.) 
The third was shot by Dr. Walbridge, at Mosca Pass in the San 
Luis Valley, the third week in August, 1879. (Ingersoll, B. N. 
O. C. V. 1880, 121.) The fourth was found dead in 1883 in the 
same place where Dr. Walbridge took his specimen. The fifth, 
by C. E. Aiken, in nestling plumage, about the middle of Sep- 
tember, 1883, near Colorado City, at an altitude of 7,500 to 8,000 
^.feet. (Fourth and fifth specimens, Brewster B. N. O. C. VIII. 
1883, 123.) The sixth, seventh and eighth, by W. G. Smith, 
in Estes Park, one June 2, 1890, a female and nest with three 
fresh eggs, at 10,000 feet; one June 4 at the same altitude, a 
female, nest and two fresh eggs; one June 20, a female, nest and 
four partly incubated eggs at 8,000 feet. (O. and O. XVI. 1891, 
27.) The ninth, by Evan Lewis, near Idaho Springs, June 7, 
1890, a nest with three eggs at 8, 700 feet. (Bendire, Life Histories 
N. Am. Birds, 1892, p. 375.) The tenth was taken July 17, 
1884, near Evergreen P. O., Jefferson County. (H. G. Smith, 
Auk, X. 1893, 364.) In addition to these only six other speci- 
mens are known from the rest of the United States, and there 
are no records of its breeding anywhere but in Colorado. There 
is a specimen in the National Museum at Washington that 
bears the date June 10, 1890 and was taken in Estes Park by 
W. G. Smith. It is presumably one of the three mentioned 
above, but it cannot now be learned which one it is. Mr. Dennis 
Gale writes that he took one twelve miles from Gold Hill in 
the direction of Estes Park. This makes the eleventh specimen 
for Colorado. Of these eleven, seven have been taken in Boul- 
der County or vicinity. 
375a. Bubo virginianus subarcticus. Western Horned 
Owl. 
Resident; common. Not enough material has accumu- 
lated to define the range of the different forms of the Horned 
Owl in Colorado. The following statements are given with the 
knowledge that they aie far from complete and quite liable to 
error. But they seem to be the best explanation that can be 
given of the known facts. The second edition of the A. O. U. 
Check List gives subarcticus as the only form breeding in Colo- 
rado, confining arcticus during the summer to Arctic America, 
with a southern migration in winter to Montana and Wyoming. 
The earlier writers went to the opposite extreme and referred 
all Colorado birds to arcticus. The present writer is inclined to 
accept the theory that subarcticus is the form of the lower por- 
tions of the State, breeding commonly along the timbered river 
bottoms. How far this form extends into the mountains is not 
