604 BaLLETIN 50, UNITED STATES NATIONAL MITSEUM. 



olensis, type of the genus) differs in proportionally smaller, narrower 

 and more acute bill and in having chestnut under parts. 



KEY TO THE SPECIES OF ORYZOBOEUS. 



a. Larger (wing 64.77-71.88, exposed culmen 17.27-19.05); bill pale brownish or 

 dull whitish, in adult male more or less dusky in female and young. (Eastern 

 Nicaragua.) Oryzoborns nnttingi (p. 604) 



aa. Smaller (wing 53.09-57.91, exposed culmen 12.70-13.97); bill black in both aexea. 

 (Southern Mexico to Isthmus of Panama.) Oryzoborus funereuB (p. 605) 



ORYZOBORUS NUTTINGI Ridgway. 

 NTTTTING'S RICE GROSBEAX. 



Adult male. — Entirely uniform deep black, including under wing- 

 coverts and axiUars; inner webs of primaries dusky graj'ish, becoming 

 paler, but not inclining to white, basally; bill wholly pale brownish or 

 brownish white; legs and feet dusky; length (skins), 140.97-149.86 

 (146.30); wing, 66.04-71.88 (69.34); tail, 63.25-66.56 (65.28); exposed 

 culmen, 17.27-19.05 (18.03); depth of bill at base (two specimens), 

 16.51-17.53 (17.02); tarsus, 18.29-19.05 (18.80); middle toe, 14.22- 

 15.24 (14.73).^ 



Adult female. — Above uniform deep brown (intermediate between 

 mummj' brown and raw umber) ; beneath uniform raw-umber brown, 

 varying to deep cinnamon-brown or russet; bill dusky, sometimes 

 nearly black; length (skins), 126.75-133.86(130.30); wing, 64.77-66.29 

 (65.53); tail, 60.96-61.98 (61.47); exposed culmen, 17.27-17.78(17.53); 

 depth of bill at bace, 17.27; tarsus, 18.03-19.05 (18.54); middle toe, 

 13.97-14.48 (14.22).^ 



Immature male. — Similar in coloration to the adult female, but 

 darker, the upper parts rich bistre brown (remiges and rectrices clove 

 brown), the under parts deep russet-brown, paler (inclining to cinna- 

 mon) on chin and abdomen. 



Immature female. — Similar to the adult female, but under parts less 

 tawny brown (nearly raw umber), and tertials margined with light 

 rusty. 



Eastern Nicaragua (Los Sabalos, Gi-eytown, Escondido River, etc.). 



Oryzoborus nuttingi Eidgway, Proc. U. 8. Nat. Mus., vi, Apr. 11, 1884, 401 (Los 

 Sdbalos, e. Nicaragua; U. S. Nat. Mus.). — Salvin and Godman, Biol. Centr.- 

 Am., Aves, i, 1885, 348.— Shaepe, Cat. Birds Brit. Mus., xii, 1888, 80.— 

 Richmond, Proc. U. S. Nat. Mus., xvi, 1893, 491 (Grey town and Rio Escon- 

 dido, e. Nicaragua). 



' Five specimens. 



' Two specimens, one of them immature though full grown. 



