H0 , NORTH AMERICAN BIRDS. 
3. Syrnium. Five to six outer quills with their inner 
webs emarginated. Top of cere more than half the culmen. 
Without ear-tufts. Bill yellow ; iris yellow or black. Size 
medium or large. (Page 118.) 
M: Six quills emarginated ; toes densely feathered, the ter- 
minal scutellse concealed ; iris yellow. Size very large. 
(Page 118.) Scotiapiex. 
;!'§ Five quills emarginated; toes scantily feathered, the 
terminal scutellse exposed ; iris black. Size medium. 
(Page 118.) . . Syrnium. 
• 4. Nyctale. Two outer quills with inner webs emar- 
ginated. Top of cere less than half the culmen, level. With- 
out ear-tufts. Bill yellow or blackish; iris yellow. Size 
small. (Page 119.) 
14 Anterior edge of the ear-conch without an operculum. The two 
ears symmetrical. Tail slightly rounded, only about half as long 
as the wing. 
5. Scops. Two to five quills with inner webs emarginated ; 
second to fifth longest. Bill weak, light-colored ; iris yellow. 
Ear-conch elliptical, about one third the height of the head, 
with a slightly elevated fringed anterior margin. Size small ; 
ear-tufts usually well developed, sometimes rudimentary. 
(Page 119.) 
6-. Bubo. Two to four outer quills with inner webs emar- 
! ginated ; third to fourth longest. Bill robust, black ; iris 
orange-yellow. Ear-conch elliptical, simple, from one third 
to one half the height of the skull. Size large. Ear-tufts 
well developed or rudimentary. (Page 120.) 
Ear-tufts well developed. Two to three outer quills 
with inner webs emarginated; lower tail-coverts not 
reaching end of the tail. Toes covered with short feathers, 
the claws exposed, and bill not concealed by the loral 
feathers. (Page 120.) Bubo. 
t' : "- Ear-tufts rudimentary. Four outer quills with their 
f inner webs emarginated ; lower tail-coverts reaching end 
of the tail. Toes covered with long feathers, which hide 
the claws, and bill nearly concealed by the loral feathers. 
(Page 121.) Nydea. 
'*■ ftt Similar to the last, but the tail graduated, nearly equal to the 
wing. 
7. Surnia. Four outer quills with inner webs emarginated. 
Third quill longest/ Bill strong, yellow ; iris bright yellow. 
Ear-conch simple, oval, less than the diameter of the eye. 
Size medium; no ear-tufts. (Page 121.) 
II. Nostril, a small circular opening into the surrounding inflated membrane 
of the cere. Ear-conch small, simple, oval, or nearly round, without an 
operculum. 
First quill shorter than the tenth. 
8. Glaucidium. Third to fourth quills longest ; four emargi- 
nated on inner webs. Tarsus about equal to the middle toe, 
densely feathered. Tail much more than half the wing, 
rounded. Bill and iris yellow. Size very small. (Page 121.) 
