IS/6.] NEOTROPICAL ANATID.E. 3/5 



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

 eastward limit be as yet denned. 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. 762 ; Scl. 

 P. Z. S. 1864, p. 299 (partim) ; Scl. & Salv. P. Z. S. 1866, p. 200 

 (Ucayali); Leot. Ois. Trim p. 50/ (1866) (Trinidad); 8chl.Mus.des 

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

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



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

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

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

 riore ; gutture albicante, torque colli inferi indistincte castaneo ; 

 dorso medio late castaneo ; ventre, alls et cauda nigris ; tectrici- 

 bus alarum minoribus internes ochracescentibus, mediis canis, 

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

 remigum tectricibus albis; crisso albo nigroque vario, rostro 

 rubro, ungue nigro ; pedibus jtavis : long, tota 160, alee 80, 

 caudce 2'5, rostri a rictu 2"2, tarsi 2'Q, dig. med. cum ungue 2'5 

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

 Ilab. Columbia, S. Martha (Deppe, in Mus. Berol.) • Surinam 

 (Kappler) ; Trinidad (Leotaud); Guiana (Schomb.); Cayenne 

 ( Buffoti) ; Ucayali (Bartlett) ; Barra do 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 different 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 (1766) ; 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) ; Gundl. Repert. F.-N. i. p. 387 



