58 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. IX. 



Distance from nostril to tip of bill, more than 1.50 ; head, brownish, 



palest on the throat; speculum, white (female). Mergus serrator. 



Red-breasted Merganser. 

 See No. 38. 



Subfamily ANATIN^E. River and Pond Ducks. 



Ducks having hind toe without mem- 

 braneous lobe or flap; tarsus, scutellate in 

 front. 



Querquedula discors. 



* GROUP 1. Wing, 5 to 7.50 inches long; hind toe, without 



flap or lobe. 



Large patch pale blue 

 on wing (coverts); white 

 crescent on face (male ) ; no 

 white crescent, face speck- "~^\ 



L led ; chin whitish (female ) . 



Common in Eastern United States. 



Querquedula discors. 

 Blue-winged Teal. 

 See No. 46. 



Large patch of pale blue on wing (coverts); head and breast, 

 rufous brown; crown, blackish (male); sides of head, speckled (dull 

 white, dotted with black) ; chin and throat, dusky, tinted with rufous 



(female ) . Western species, rare east of the Mississippi River. 



Querquedula cyanoptera. 

 Cinnamon Teal. 



See No. 47. 



No blue patch on wing; head, rufous brown, with large patch of 

 green through eye to nape ; speculum, black and green (male); head, 

 speckled. No blue patch on wing (female). Nettion carolinensis. 



Green-winged Teal. 



* For directions for measurement, see page 21. 



See No. 45. 



