xlii. 



I. Length over 20 inches. 



II. Length under 16 inches. 

 A. Length over 13 inches. 



1. Whole top of head blacl< 

 a. Bill wholly or mostly 



11). I'nder parts pure white. 

 (2). Under parts grayish. 

 _>. Forehead or crown white or gray. 



a. Whole outer tail feather white. 



b. Inner web of outer tail feather not white. 



c. Outer weh of outer tail feathers darker than 



web. 

 !. Length under 11 inches. 



1. I'nder parts white. 



2. I'nder parts Mack. 



267. Caspian Tern. 



270. Roseate Tern. 

 268. Forster Tern. 

 266. GulUbilled Tern. 



268. Forster Tern. 



269. Common Tern. 



270. Roseate Tern. 

 268. Forster Tern. 



1269. Common Tern. 



271. Least Tern. 



272. Black Tern. 



( )KI>Kk 



ANSERES. Ducks, Geese, Swans. 



Subfamily 



Merginae. Mergansers. 



To 



-■11, 



larg, 



are enabled to eaten Willi tlie 

 distances, pursuing the fish und 

 water, some individuals of ine 

 waters afford good feeding places. 



I. Length under 18 inches. A conspicuous hood. 



II. Length over 21 inches. 



A. Head and throat Mack. 



1. Under parts white, tinged with salmon. 



2. Breast brownish, heavily streaked with black. 



B. Head and sides of neck rufous-brown. 



C. Head and sides of neck grayish-brown, washed 



civ upon tish which they 

 ilily and for considerable 

 nd considerable bodies of 

 rsr the winter where open 



309. Hooded Merganser. 



307. American Merganser. 



308. Red-breasted Merganser. 

 307. American Merganser. 



rut". 



Subfamily 2. ANATlNAE. 



308. Red=breasted Merganser. 

 River and Pond Ducks. 



The members of this group may be known at once by the absence of a flap or lobe on the 

 hind toe. They feed in shallow water, immersing only part of the body, and hence are called 'Tip- 

 up's'. A feeding flock with heads down and tails in the air looks like the scoring end of a bowl- 

 ing alley. They take wing readily from the water. 



_ength unde 

 Under pa 



I'nder pa: 



2. Lesser u ing ci n erl • graj 

 II. Length over [8.00 inches. 

 A. Belly not conspicuouslj str 

 T. Head shining dark green. 

 2. Center of head white or \ 

 ">,. Crown greenish, thni.it u 



4. Crown buffy, throat black 



5. Crown dark olive-brown. 



■aked < >r -potted. 



288. Blue-winged Teal. 

 287. Green-winged Teal. 



281. Mallard. 



286. Baldpate. 



292. Wood Duck. 



285. Widgeon. 



291. Pintail. 



W 



284. Gadwall. 



291. Pintail. 

 286. Baldpate. 

 284. Gadwall. 



290. Shoveller. 



