~J 
11. 
il, 
13. 
13. 
15. 
15 
. Very nate Gheswenoute the feet Seetnipeti tiie. Rinak Arctic Higcaed Gul: 
. Darker, but not buffy or ferruginous; the feet more or r less spotted. . 
54 
* 
Famity BUBONIDA—HorneEp Owls, ETC. 
. Tarsus partly bare, twice as long as middle toe; wing 54 to 74 inches 
long. . PTS a a Sa Se ee eee Bee oR 
. Tarsus fully feeerca ot Soe eS SWS piles ps eR Sees ae Lo oh Nace i (2) 
2. Head with conspicuous’ ear-tufts. 5.0 ects. @ ote ee er ee 
2. Headswithout!ear-tutts. s.r. oon. ).e ian cacceue ek eee ee omen oun) 
SAGE BANE GE OF een RLER\S ee ca nets Ge eae a 
. Wing over 8 inches long... .. Se oacctes eee cre ade) 
4. Without ear-tufts; wing 34 ey 4 macted ieee ......Pygmy Owl. 
4. With ear-tufts; wing over 4 inches long. . NO MPR ER ape teen) 
. Toes entirely naked to extreme base; ear-tufts sina 
Blanimglated Screech Owl. 
‘ nes dictinatlye. fonincted 4 or Sfieeleds on upper side; ear-tufts rather 
VATE) Meee AS Se Ge te IE 2 OUT ea (6) 
6. Above gray, irregularly marked with black; below gray, white, 
rusty and black, (gray phase); or above bright rusty brown with 
a few black streaks; below white streaked with black and barred 
with rusty brown, Gaal PIUASE) ya. ae pee .Screech Owl. 
6. Very pale; above with a pale grayish buff cedeeanaaees black 
markings se very narrow and less numerous than in 
ouher forms: 2202. mse .Rocky Mountain Screech Owl. 
. Size large, form robust; wing 14 to i8 chee long. . Ee ee or 8 CS) 
. Size medium, form slerichar: wing 11 to 13 inches lanes Bas ee We se ee ee (0) 
8. General color darker, much suffused with ee and rufous. 
gees .Great Horned Owl. 
8. General: Salles nether chan: grayer, eh little or no buffy in plumage 
-(9) 
. Western Horned Owl. 
10. Tea tufts fered ed Roniposed cn 8 43 12 Reena ; 
.American Lodpcusred Owl. 
10. Bar- ‘iis anal aac a few feughers ea MARA Short-eared Owl. 
Wing 10 inches or under. . . eee yee oa a ans oe 
Wing more than 10 inches long... .. = BF Sie laps Heer pee Leas) 
12. Wing 8 to 10 inches long heals ies in appearance...:.... 
i, ee ee . American Hawk Owl. 
12) Wi ing 5 ie 8 a oe ions met: Ahan #(aS) 
Length 10 inches; above eae Gromee main numerous mace poe 
especially on head. Rr Mey: ke .Richardson Owl. 
Length 8 inches; ae einnamon oa: Gane with many streaks; 
hind head aids POWr heehee es hee .Saw-whet Owl. 
14. General color white, more or alee paced with aes : 
Fis Sc sgcereeoutal aes ‘seaman 
14. General colunanu apuneme SES, vaihe cotta Sek cS aS ac RAI eae eee LED) 
Length 20 inches; eyes black; breast penred: Siu hana a cass ie Barred Owl. 
Length 27 inches; eyes v Mews breast streaked ....... Great Gray Owl. 
