1876.] NEOTROPICAL ANATID^. 3/5 



Guayaquil ; but this, too, remains to be determined ; nor can its 

 eastward limit be as yet defined. The form found in Trinidad (as 

 described by Leotaud) certainly belongs to the next species. 



3. Dendrocygna discolor. 



Dendrocygna autumnalis, Cab. in Schomb. Guian. iii. p. 7(52 ; Scl. 

 P. Z. S. 186-1, p. 299 (partim) ; Scl. & Salv. P. Z. S. 1866, p. 200 

 (Ucayali); Leot. Ois. Trin. p. 507(1866) (Trinidad); Schl. Mus. des 

 P.-B. Anseres, p. 92; Pelz. Orn. Bras. p. 320 (1870); Finsch, 

 P. Z. S. 1870, p. .589 (Trinidad). 



Cunnrd Siffleur de Cayenne, Buff. PI. Enl. 826. 

 Dendrocygna discolor, Scl. & Salv. Nomencl. p. 161 (1873). 

 Capite, collo anfico,pectore et dorso superiore griseis,pileo obxcu- 

 riore ; gutture albicante, torque colli inferi indistincte castaneo ; 

 dorso medio Icete castaneo ; ventre, alis et cauda nigris ; tectrici- 

 bus alarum ■minoribus internis ochracescentibus, mediis canis, 

 externis alhis ; remigibus (extimo excepto) in pogonio externo et 

 remigum tectricibus albis ; crisso alio nigroque vario, rostro 

 rubra, ungue nigra; pedibiis Jlavis : long, tata 16'0, alee 8'0, 

 caudce 25, rostri a rictu 22, tarsi 2'0, dig. med. cum uttgue 2'5 

 (Descr. exmpl. ex Surinam in Mus. S. & G.). 

 Hab. Columbia, S. Martha (Deppe, in Mus. Berol.) ; Surinam 

 (Kappler) ; Trinidad (Leotaud) ; Guiana {Sc/iotnb.) ; Cayenne 

 {Bitffon^; Ucayali {Bartlett); Barrado Rio Negro, and Minas Geraes 

 (^Natterer). 



Obs. Similis prsecedenti, sed dorso superiore et pectore canis nee 

 castaneis. 



This southern form of D. autumnalis is distinguishable at a glance 

 from that of Central America by the upper portion of the back being 

 of a diiFerent colour from the middle and lower back — the former 

 being of a grey tint, the latter rich chestnut-brown. In the northern 

 form no such difference is apparent, the whole upper surface being of 

 the same chestnut tint. The breast in the former bird also is greyish, 

 and in the latter chestnut. 



D. discolor, as we have proposed to term it, is found in the northern 

 part of South America, extending from the littoral of Columbia and 

 Guiana over the great Amazon valley, and occasionally ranging as far 

 south as Mato Grosso and the interior of Minas Geraes, where spe- 

 cimens were obtained by Natterer. 



4. Dendrocygna arborea. 



Anas arborea, Linn. S. N. i. p. 207 ( 1 766) ; Gm. S. N*. i, p. 540 

 (1788); Vieill. Enc. Meth. p. 141 (1823). 



Dendrocygna arborea, Eyton, Mon. Anat. p. 110 (1838); Gosse, 

 B. Jam. p. 395 (Jamaica) ; Cab. J. f. Orn. 1857, p. 227 (Cuba) ; 

 Thienem. J. f. Orn. 1857, p. 157 (Cuba) ; A. & E. Newton, Ibis, 

 1859, p. 366 (St. Croix); Scl. P. Z. S. 1864, p. 300; March, Pr. 

 Ac. Phil. 1864, p. 70 (Jamaica) ; Gnndl. Repert. F.-N. i. p. 387 



