ORYZOBORUS. 423 



Genns ORYZOBORUS Cab. 



Ori/zohorus Cabanis, Mus. Hein. i. p. 150, 1851. Type O. angolensis 

 (Linn.). 



Fig. IGl. — Ori/zohorus crassirotris. 



The species included in this ^i^enus belong 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 as 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, wingless than 62 mm. ; l)ill black ; 



abdomen chestnut O. hrevirosfris, ]>. l^;!. 



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



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



616. Oryzoborus brevirostris. 

 Small-billed Tropical Seed-Finch. 



Oryzohorus forridus (noc Scop.) Salvin, Ibis, 1885, p. 214 (Koraima, 

 Ji5l)0ft., Mcnunu Mts., Caniacusa, Bartica Grove) ; Sharpo, Cat. H. 

 Brit. Mus. xii. p. 77, 18SS (Rctraima, Caniacusa, Bartica Gn»ve) ; 

 (^iiflcli, Tim<'hri (2) v. p. S5, 1891 ((rcorgctown) ; Heche, Our 

 Search for a Wildcnit-ss, pp. 121, 127, 1910 (Georgetown). 



