BUTEO MORPHNUS. 61 



2. BUTEO. 

 a. With feathered tarsi. 



F. layopm. Twenty-four remiges : the first four with an emargination ; the fourth longest. 

 External branch of the pectoral portion of the inferior tract quite free. Lumbar tract very 

 indistinct. 



6. With naked tarsi. 



1. F. buteo. Twenty-five remiges : first four with an emargination of the inner vane ; first as 

 long as the eighth, second longer than the sixth, third and fourth the longest. Dorsal part of the 

 spinal tract rather far removed from the scapular part. Internal branch of the jugular part of the 

 inferior tract distinct, but short ; its union with the pectoral stem very narrow. Pectoral stem 

 united in front with the humeral tract ; its external branch quite free, with a very distinct hook at 

 the end. 



2. F. baccha (Htzmatornis GOULD). LE VAILL., Ois. d'Afr., PI. 15. Twenty-five remiges; 

 the first as long as the tenth, the second as long as the seventh, the third equal to the sixth, the 

 fourth and fifth of equal length and the longest ; first five with a slight diminution of the inner 

 vane. Pterylosis exactly as in F. buteo. Outer branch of the inferior tract quite free, with a 

 hook at the end. Tarsi and bases of the toes scaled; only the second half of the toes with 

 scutes. Tarsi long ; toes short. The separation of this bird from the Buteones appears to be 

 necessary on account of the shortness of the wings, which reach only to about the base of the tail. 

 It somewhat approaches the Harpyite. 



3. F. busarellus, SHAW. Le Suseray, LE VAILL., Ois. d'Afr., I, PL 20. Twenty-five remiges ; 

 the first five graduated ; but the third, fourth, and fifth differing but little in length, although the 

 fifth is the longest. The narrowing of the inner vane very gradual, forming no emargination. 

 Pterylosis resembling that of F. buteo ; but the external branch of the pectoral stem of the inferior 

 tract only half free, as in the Sea-Eagles. 



3. MORPHNUS. 

 a. With naked tarsi. 



F. urubitinga TEMM., PI. Col., 55. Both eyelids with weak eyelashes. The remiges of the 

 specimen examined were being moulted, but were probably twenty-five in number ; the first very 

 short ; the second, third, and fourth uniformly graduated, the latter the longest, but the fifth only 

 a little shorter, and the sixth as long as the third. The first four with a deeply seated but slight 

 angular emargination. Secondaries long ; the longest of them equal to the second primary. 

 Pterylosis somewhat peculiar, especially on account of the very small breadth of all the tracts. 

 Jugular portion of the inferior tract with a very narrow inner branch, and united to the pectoral 



