OEYZOBORUS. 423 



Genus ORYZOBOEUS Cab. 



Oryzohorm Cabanis, Mus. Hein. i. p. 150, 1851. Type O. angolensis 

 (Linn.). 



Fig. 161. — Oryzohorus crassirotris. 



The species included in this genus bdong to the thick-billed 

 Finches. The bill is short and stout, the length of the exposed 

 culmen is about equal to its depth at the nostrils, and its width at 

 the base is about one-fifth less. The wing is rounded, the third, 

 fourth, and fifth primaries longest and equal, the second about 

 equal in length to the sixth, and the first about equal to the 

 eighth. The tail is slightly rounded at the tip, the outermost 

 feather on each side being about 7 mm. shorter than the 

 middle ones, which are nearly as long aa the wing. The tarsus 

 exceeds the length of the exposed culmen by more than one-half. 

 Coloration : male and female different. 



Key to the Species. 



A. Smaller, wing less than 62 mm. ; bill black ; 



abdomen chestnut O. hrevirostris, p. 423. 



B. Larger, wing more than 62 mm. ; bill 



white ; abdomen black , O. crassirostris, p. 425. 



616. Oryzoborus brevirostris.i 



Small-billed Tkopioal Seed-Finos. 



Oryzohorus torridus (nee Scop.) Salvin, Ibis, 1885, p. 214 (Eoraima, 

 3500 ft., Merume Mts., Camacusa, Bartica G-rove) ; Sharpe, Cat. B. 

 Brit. Mus. xii. p. 77, 1888 (Eoraima, Camacusa, Bartica Grove) ; 

 Quelch, Timehri (2) v. p. 85, 1891 (Georgetown); Beebe, Our 

 Search for a Wilderness, pp. 121, 127, 1910 (Georgetown). 



