RIVER DUCKS. 101 



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

 c 1 . 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". 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 ( $ 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. 



130. WIDGEON ( $ ad.). 



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



143. PINTAIL ( 9 ad.). 



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

 blackish. 



f 1 . Wing-coverts with more or less chestnut .... 135. GADWALL. 

 ff l . 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 witli black. 



135. GADWALL 9 . 



2?. 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 l . Lesser wing-coverts brownish gray, bordered with white or tipped 



with black. 



i 2 . Speculum \ 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 DICK. 



0. Belly chestnut 142. SHOVELER $ . 



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 grayisli brown ; rump 

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

 rich purple, bordered at the base and tip by narrow bauds 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. 



