20 
Plate III 
Butko borealis calurls 
and 
B UTEO BOREALIS 1IARLANI 
Diagrammatic representation showing characteristic body and tail colorations 
Figure 1. Sex? ad. From Plate XIV, U.S.P.R.R. Exp. and Surveys, vol. X. 
Approximate type of Buteo calurus Cassia. One of the two specimens of this supposed new 
species known at the time to the describe!*. It agrees closely with the original description 
and may be t he type. It was taken either near Fort Webster, New Mexico, date not given, 
or at Petaluma, California, April 25, 1856. 
Figure 2. 20395 cfad. Chit ina River glacier, Alaska, Mount Logan area, July 20, 1925. 
The mate of the next and parent of the two succeeding specimens. This is an almost typical 
black-phased calurus. 
Figure 3. 20382 9 ad. Chit ina River glacier. Alaska, Mount Logan area, July 14, 1925. 
The mate of the preceding and parent of the two succeeding specimens. A typical harlani in 
light phase. The amount of white on head suggests an approach towards krideri. 
Figure 4. 20393 9jv. nestling. Chit ina River glacier, Alaska, Mount Logan area, July 19, 1925. 
Offspring of two preceding and nest sister to the following specimen. The blackest and most 
completely melanotic of the brood of three. Note that the brown is almost black. 
Figure 5. 20394 cfjv. nestling. Clutina River glacier, Alaska, Mount Logan area, July 19, 1925. 
Offspring of figures 2 and 3 and nest brother to preceding specimen. The lightest and brokenly 
melanotic of brood of three. The tail is essentially like that of preceding, but with a 
suggestion of red bordering the subterminal band. Note that the black is distinctly 
brownish. 
Figure 6. 19690 9 ad. Red Deer river, near Nevis, Alberta, June 29, 1925. 
Parent of next specimen. The body of this bird is strongly krideri , the tail is typical harlani. 
This is the most southern substantiated breeding record for harlani influence. 
Figure 7. 19691 sex? jv, nestling. Red Deer river, near Nevis, Alberta, June 29, 1925. 
Offspring of preceding. Rather light in general colour, but not certainly distinguishable from 
many borealis of same age. 
Figure 8. cf or 9 jv. Near St. Franeisville, Louisiana, autumn, 1829. The type of Buteo 
harlani. Audubon. Drawn from Plate LXXXIV, “ Birds of America,” and corrected from 
notes made from the original drawing in the New York Historical Society collections in 
Ne *w \ ork. Nolo that the bird is not certainly identifiable as between juvenile harlani 
and calurus in black phase. 
