iSS 3 -] 
Allen a nd Brewster on Colorado Birds. 
r 53 
tern varieties.”* In so far as fiallasi and auduboni are concerned I am 
inclined to agree with the first part of this proposition, but I should apply 
it also to the proposed new character, which seems to me an equally 
“microscopic one.” Fortunately, however, there is no necessity for “split- 
ting hairs,” the differences in general size and coloration between auda- 
b on i and fiallasi being readily appreciable. 
3. Turdus ustulatus swainsoni. Swainson’s Thrush. — 
First seen May 8, in large numbers. They continued abundant 
for several days, and were occasionally observed as late as May 23. 
4. Oroscoptes montanus. Sage Thrasher. — A few were 
seen April 10 to 15, but none later. 
5. Mimus polyglottus. Mocking Bird. — One was taken 
at Austin’s Bluffs April 26, — the only one seen. Mr. Aiken in- 
forms us that they occur occasionally about Colorado. Springs, and 
that they breed abundantly a few miles to the southward, toward 
Pueblo, nesting in the cactus bushes. 
6. Mimus carolinensis. Cat Bird. — First seen May 10, and 
became more or less common in suitable localities a few days later. 
7. Harporhynchus rufus. Brown Thrasher. — First seen 
May 13, and immediately became more or less common in suit- 
able localities. 
8 . Harporhynchus bendirei. Bendire’s Thrasher. — 
One was taken May 8 at Austin’s Bluffs. (See this Bulletin, 
Vol. VIII, p. 57.) 
9. Sialia mexicana. Western Bluebird. — First seen 
March 21. Later was more or less common in the creek bot- 
toms till May 10. Large, mixed flocks of this species and S. arc - 
tica were seen on a few occasions, when heavy falls of snow had 
driven them down from the foothills. Were found breeding in 
June on West Monument Creek, down to the very edge of the 
plains. 
10. Sialia arctica. Arctic Bluebird. — First noticed about 
the middle of March, and for some weeks were rather common 
in all suitable localities— that is wherever there were trees. Were 
frequent in the towm till into April, where they were as unsus- 
picious and confiding as the common Bluebird is in the East. 
Later they retired to the timbered creek bottoms, the bluffs, and 
foothills to pass the breeding season. One or two pairs were re- 
ported nesting in the town in boxes provided for their accommo- 
dation. 
*This Bulletin, Vol. VII, p. 127 (foot note). 
