-v- 



Vol. xlii.] 76 



or the basal joint of the phalanges ; claws, especially that of 

 the hind toe, exceedingly large and strong. 

 Type. Falco coronatus Linnasus. 



Cassinaetus, gen. nov. 



Bill moderately strong ; wing moderately long and 

 pointed, the primaries exceeding the secondaries by nearly 

 one-fifth of the total length of the former, the fourth and 

 fifth primaries subequal and the longest ; tail fairly long, 

 the outer feathers slightly shorter than the middle ones ; 

 tarsus long and rather slender, thickly clothed with feathers 

 w^ell down or to the first joint of the phalanges; claws 

 moderate, hind claw the longest. 



Type. Limnaetus africanus Cassin. 



Genus Ortholophus. 



It has been pointed out to me by Mr. Tom Tredale that 

 this genus, introduced by Mr. Ogilvie-Grant (Cat. Birds 

 Brit. Mus. xvii. p. 424, 1892) for two West African Horn- 

 bills, is preoccupied by Ortholophus Bigot, Bull. Soc. Ent. 

 Fr. (6) ii. p. 129 (1882)^ for a genus of Diptera. I propose 

 to substitute 



Tropicranus, gen. nov., 



for Mr. Ogilvie-Grant's Ortholophus with tj^pe Ortholophus 

 cassini Finsch, as designated in my previous note (Bull. Brit. 

 Orn. CI. xlii. p. 44, 1922). The name derives from rpoTrt?, 

 a keel, and Kpdvo<i, a helmet. 



Mr. P. F. BuNYARD exhibited mounted specimens of nest, 

 feathers, and down of the Buffel-headed Duck {Bucephala 

 alheola) from Buffalo Lake, Alberta, taken by Messrs. H. G. 

 Lings and C. B. Horsbrugh on June 7th and 13th, 1920. 



Description. — Feathers (type or predominating feather) : 

 terminal portion pure white, basal or downy poi'tion greyish 

 white, paler where it meets the terminal portion ; the 

 calamus is distinctly a warmer shade of grey. 



Measurements (average) 2& mm. 



