422 A^ATTD^E. 



d" '. Wing not less than 7 inches. 

 f 3 . A speculum present, either metallic or 



black and white. 

 a 4 . Bill not spatulate, and but little if at 



all broader near the tip. 

 a 5 . Upper wing-coverts not blue nor 



bluish grey. 

 a. Tail moderate, median rectrices 



not lengthened. 



a 7 . Lamellae tine, projecting con- 

 siderably beyond' mandibles; [p. 440. 

 speculum black and white .... CHAULELASMUS, 

 ft 7 '. Lamellae moderate, not pro- 

 jecting ; speculum partly or 

 wholly green or purple. Bill 

 from forehead longer than 

 tarsus. 



a 8 . Tail of 18 or 20 feathers ANAS, p. 435. 



b. Tail of 14 or 16 feathers. 

 a 9 . Nail about one-third width 

 of bill ; head of male 

 crested and tertiaries falcate EUNETTA, p. 438. 

 ft 9 . Nail less than one-third 

 width of bill ; no crest nor 



falcate tertiaries NETTIUM, p. 441. 



c 9 . Nail more than one-third 

 width of bill ; no crest nor 



falcate tertiaries MARECA, p. 445. 



ft 6 . Median rectrices lengthened and 



pointed DAFILA, p 447. 



b s . Upper wing-coverts lavender-blue . . . QUERQUEDULA, 

 ft 4 . Bill spatulate, nearly twice as broad [p. 449. 



near tip as near base SPATULA, p. 451. 



g*. No speculum ; sexes alike ; plumage dull [p. 454. 



greyish brown ." MARMARONETTA, 



ft. Hind toe broadly lobed, breadth of lobe one- 

 third to one-half length of toe. 

 c'. Tail less than half length of wing. 



e n . Upper mandible at base not so high as broad. 

 A 3 . Bill viewed from above tapering 



slightly from base ; tail-feathers 16 .... NETTA, p. 455. 



i 3 . Bill not tapering ; tail-feathers 14 NYIIOCA, p. 458. 



/". Upper mandible at base higher than broad . CLANGULA, p. 464. 

 d'. Tail half as long as wing ; bill much swollen [p. 465. 



at base EIUSMATURA, 



Genus SARCIDIORNIS, Eyton, 1838. 



Size large, the plumage of the sexes differing very little, but the 

 male much larger than the female. Bill of moderate length, 

 considerably raised at the base and of nearly the same width 

 throughout, furnished above in the male with a fleshy knob that 

 becomes greatly developed in the breeding-season (fig. 101). 

 Wing with a prominent tubercle in front of the bend. Tail of 12 

 feathers, rounded. Lower end of trachea expanded on the left 

 side only. Hind toe with a narrow lobe. 



This genus contains two species, one found in India and Africa, 

 the other in South America. 



