28 Mr. C. Chubb on Birds from [Ibis, 



Adult presumed male. Allied to 0. g. pachyrhynchus, but 

 differing in having the rufous at the base of the bill, lores, 

 clieeks, and chin much paler in colour, the lower back, rump, 

 and upper tail-coverts darker, the under surface also darker 

 ochreous brown, more narrowly barred and tinged with pale 

 slate-grey, and rather smaller in size. 



Total length 210 mm., exposed culmen 21, depth of bill 14, 

 wing 143, tail (imperfect) 53, tarsus 45. 



Adult presumed female. Similar to the presumed adult 

 male, differing only in the almost entire absence of the 

 rufous at the base of the bill, lores, cheeks, and chin. 

 Wing 144 mm. 



Habitat. Eastern Ecuador. 



The male and female described were collected at Sarayacu 

 in eastern Ecuador by tlie late Clarence Buckley, in whose 

 memory this subspecies is named, and are now in tlie British 

 Museum, Salvin-Godinan collection. 



Key to the Subspecies. 



A. Under surface for the greater part rufous 



or ochreous, not duskj^ brown pro- 

 fusely barred ; chin and throat usually 

 chestnut. 



a. Lower back and rump dark rufous- 



brown spotted witli black O. yuianensis (/uianensis. 



b. Lower back and rump paler and in- 



cliniug to grey, also spotted with 



black O. guianensis rufinus, p. 25. 



c. Lower back and rump almost uniform 



isabelline, the black spots small and 



very few in number 0. f/uumensis simo7isi, p. 26. 



B, Under surface for the most part dusky 



brown profusely barred throughout ; 

 chin and throat usually brown or 

 whitish. 



d. Depth of bill less than 13 mm. 



d'. Larger: *wing more thanl55 mm,; [p. 26. 



sides of face dull cliestnut O. guianensis viarnwnttuSj 



e'. Smaller: wing less than 155 mm.; 



sides of face bright riifous-chest- [p. 26 



nut O. guianensis panamensiSf 



