15 
Swarth, Harry S, „ . , __ 
1922. "Birds and Mammals of the Stilane River Region of Northern British Col- 
umbia and Southeastern Alaska;” Univ. of Cal., Pub. in Zoology, vol. 24, 
No. 2, pp. 125-314. . . , 
Birds of region generally calurus, but describes light, mdm-nke birds 
breeding at Flood glacier. . „ ... , ^ , 
1924. "Birds and Mammals of the Skeena River Region of Northern British Col- 
umbia;” Univ. of Cal., Pub. in Zool., vol. 24, No. 3. 
Refers all birds to calurus. Many dark birds on migration. 
1926 "Report on a Collection of Birds and Mammals from the Atlin Region, Northern 
British Columbia;” Univ. of Cal., Pub. in Zool., vol. 30, No. 4, pp. 51-162. 
Finding of harlani breeding in Atlin country. Specimens taken and 
described and relationships discussed. 
Taverner P, a. 
1919 "The Birds of the Red Deer River, Alberta;” Auk, vol. XXXVI, pp. 1 - 21 . 
Discussion of the Red-tails of the region. The writer later reconsiders lus 
decision p. 16 that no birds could be referred to krideri. 
Tayler, Warner . , VT TTT 
1926. "Additional Records for the Madison Wisconsin Region; Auk, vol. XL111, 
pp. 380-383. t _ 7 . 
Krideri seen on January and October dates at Madison, W isconsin. 
Visher, Stephen Sargent ^ , __ . - ,, ~ , , „ 
1911 “Annotated List of the Birds of Hardmg County, Northwestern South Dakota, 
Auk, vol. XXVIII, pp. 5-16. # _ 
Calurus common summer resident, krideri observed apparently with nest. 
1913. "An Annotated List of the Birds of Sanborn County, Southeastern Central 
South Dakota;” Auk, vol. XXX, pp. 561-573. 
Krideri a common migrant. 
Warren, Edward R. 
1916 "Notes on the Birds of the Elk Mountain Region, Gunnison C ounty, Colorado; 
Auk, vol. XXXIII, pp. 292-317. 
Calurus common summer resident and breeder. 
Wetmore, Alex. T , _ , , XT , T . , 
1920 "Observations on the Habits of Birds at Lake Burford, Xew Mexico; Auk, 
vol. XXXVII, pp. 393-412. 
Calurus nesting. 
Widm ANN, Otto , , 
1907. "A Preliminary Catalogue of the Birds of Missouri. 
All forms of Red-tail are listed as occurring. Borealis appears to be. the 
most common breeder. Calurus is said to be not very rare and nestings have 
been reported. Birds closely approaching krideri are not very rare, but no 
breedings are noted and the dates are all for winter or migration seasons. 
Harlani is reported as “probably a regular summer resident”, but only a few 
specimens arc given and only November and March dates furnished. 
Williams, H. V. , _ _ . . , , ,, , Tr) 
1926. "Birds of the Red River Valley of Northeastern North Dakota; Wilson 
Bulletin, March- June. 
Krider’s Hawk given as a rare breeder, Western Red-tail as common and 
nesting, none in dark phase nest. Harlan’s Hawk rather rare migrant, and 
does not breed. 
Wilson, Gordon . 
1922. "Birds of Bowling Green, Kentucky; Auk, vol. XXX L\, pp. 233-243. 
Borealis a very rare resident. 
1923, "A Preliminary Survey of the Bird Life in North Dakota; ’ Univ. of Mich., 
Museum of Zoology, Misc. Pub, No. 10, pp. 38-39. 
Records and remarks on Krider’s, Harlan’s, and Western Red-tails. 
