Appendix, 

 ARTIFICIAL KEY TO THE OWLS. 



A. With ear tufts or horns, 



I. Size very large (2 feet long); throat con- 

 spicuously white. 



Dusky Horned Owl . '39 



II. Size medium (length 15 inches); ear tufts 

 long and conspicuous. 



Long-eared Owl . . • 32 



III. Size small (length 9 inches). 



1. Toes feathered ; color mottled gray and 

 brown. 



California Screech Owl . . 37 



2. Toes unfeathered. 



Flammulated Screech Owl . 3 8 



B. Head without ear tufts. 



I. Size very large (length 28 inches). 



Great Gray Owl . . 35 



II. Size medium (length 16 to 19 inches). 



1. Plumage brown, barred and spotted gray 

 above and below. 



Spotted Owl . . '34 



2. Plumage tawny, streaked with brown; 

 throat white. 



Short-eared Owl . . 33 



3. Plumage fawn color (more or less white 

 below), finely dotted with black and white. 

 Prominent facial disks. 



Barn Owl . . . '31 



III. Size small (length 7 to 9 inches). 



I. Feet very long and slender, largely naked; 

 an inhabitant of the ground. 



Burrowing Owl . . . .40 



282 



