144 



f"\ Tail loDg, with the central 

 feathers very long and acumi- 

 nate. 

 f^. Culmen of the bill almost 

 straight ; speculum broader 

 than the light band at the tip 



of the secondaries 



g^. Culmen not quite straight, but 

 somewhat concave; speculum 

 very narrow, much narrower 

 than the rufescent band at 

 the tip of the secondaries . . 

 /'. Upper wing-coverts blue or bluish 



. gi-«y 



e^. Bill spatulate. 



y^. No soft membrane on the sides of 

 the bill, towards its tip ; upper 



wing-coverts blue 



h^. Bill with a soft membrane on the 



sides, towards the tip 



. Speculum wanting, combined with general 



colouring grey or greyish brown. 



d". Tail normal, of moderate length ; biU 



rather long, equal in length to the 



head, not broader at the tip than at 



the base ; culmen distinct!}' concave . . 



e". Tail very short, bill broader towards 



the tip than at the base. 



f^. Bill longer than the head, at the 



base much higher than broad, with 



the culmen much concave and with 



the nail bent backwards as in Eris- 



inatura 



y^. Bill about the length of the head, 

 nearly as high as broad at the base, 

 with the culmen not very concave, 

 and with the nail almost perpen- 

 dicular ; plumage like that of the 

 species of the genus Erismatura . . 



32. Dafila, p. 270. 



33. PCECILONETTA, 



[p. 281. 



36. QUEHQUEDULA, 



[p. 290. 



37. Spatula, p. 306. 



38. Malacorhynchus, 



[p. 319. 



39. Mahmaronetta, 

 [p. 320. 



40. Stictonetta, 



[p. 324. 



[p. 325. 

 41. Heteronetta, 



23. DENDROCYCNA 



Type. 



Dendronessa, JVagl. Isis, 18.32, p. 281 {nee Sw. 1831) . . ? D. arcuata. 



Dendrocygna, Sw. Class. B. ii. p. 365 (1837) D. arcuata. 



Leptotarsis, Gould, MS. ; Eyt. Mon. Anat. p. 29 (1838). D. eytoni. 

 Dendrocycna, Sclat. P. Z. S. 1880, p. 608 (nomen 

 emend.). 



Range. Tropical regions of America, Africa, Asia, Australia, and 

 Polynesia, as far east as the Piji Islands. 



* Cf. Sclater, P. L., "Note on the Geograpliical Distribution of the Ducks 

 of the Genus Dendrocygna'' (P. Z. S. 1864, pp. 299-301) ; " Additional Notes 

 on the Anatidce of the Genera Dendrocygna and Tadoma " (P. Z. S. 1866, 

 pp. 148-150). 



