RIVER DUCKS. 101 



a . Cheeks and under parts chestnut-rufous. 141. CINNAMON TEAL ( $ ad.). 

 c l . Cheeks finely streaked with blackish. 

 c a . Under parts whitish, sometimes washed with brownish, streaked or 



spotted with blackish 140. BLUE-WINGED TEAL 9 . 



c 3 . Under parts heavily washed with chestnut-rufous and mottled with 



black 141. CINNAMON TEAL 9 . 



II. Wing over 8-50. 



A. Belly white or grayish white, not conspicuously streaked or spotted. 



a. Whole head shining dark green 132. MALLARD ( 3 ad.). 



b. Center of head white or whitish, a large streak behind the eye. 



137. BALDPATE ( $ ad.). 



c. Throat white, crown green or grayish green, tips of primaries greenish. 



144. WOOD DUCK. 



d. Throat blackish, center of crown buffy, rest of head rufous. 



136. WIDGEON ( $ ad.). 



e. Throat and sides of head olive- brown, darker on the crown. 



143. PINTAIL (9 ad.). 



/. Throat, crown, and sides of head more or less finely streaked with 

 blackish. 



/>. Wing-coverts with more or less chestnut . . . . 135. GAD WALL. 

 g 1 . No chestnut in wing-coverts. 



g*, Axillars* and sides barred with black . . . . 143. PINTAIL 9. 

 g 3 . Axillars white or speckled with black, sides plain brownish. 



137. BALDPATE 9 . 

 g*. Axillars white, sides thickly spotted or barred with black. 



135. GAD WALL 9 . 



B. Under parts conspicuously mottled, spotted, or streaked, or feathers 



margined with chestnut-rufous. 



a. With white in wing-coverts. 



a 1 . Lesser wing-coverts ashy blue 142. SHOVELER 9 . 



b 1 . Lesser wing-coverts brownish gray, bordered with white or tipped 



with black. 



J 3 . Speculum f purple 132. MALLARD 9. 



b 3 . Speculum gray and white 135. GADWALL 9 . 



b. No white in wing-coverts. 



a. Throat fulvous or buffy without streaks . . . 134. FLORIDA DUCK. 



b. Throat finely streaked with black 133. BLACK DUCK. 



C. Belly chestnut 142. SHOVELER 3. 



132. Anas boschas Linn. MALLARD (see Fig. 17, a). Ad. $ . 



Whole head and throat glossy greenish or bluish black; a white ring around 

 the neck ; breast rich chestnut; belly grayish white, finely marked with wavy 

 black lines ; under tail-coverts black ; upper back dark grayish brown ; rump 

 and upper tail-coverts black ; longer upper tail-coverts recurved ; speculum 

 rich purple, bordered at the base and tip by narrow bands of black and white. 

 Ad. 9 . Top and sides of head streaked with fuscous and buffy ; back fuscous, 



* See Fig. 64. t A colored patch in the wing. 



