92 BULLETIN ]5 3, UNITED STATES NATIONAL MUSEUM 



two-thirds of the feathers, and consequently not showing. In others 

 the shaft streaks are dark earth brown and extend to the tips of 

 the feathers, giving the throat a heavily streaked appearance. The 

 upper tail coverts also vary, but to a lesser extent. In some indi- 

 viduals they are pure white; in others subterminally spotted with 

 dull earth brown. 



The adult female agrees fairly well with another from Binder 

 River, Sudan, but is slightly redder below. Both have a whitish, 

 indefinite band on the nape, which connects with the whitish bands 

 forming the posterior margin of the facial disk. The Sudanese bird 

 has the chin and upper throat white, continuous with the disk mar- 

 gins, but ^he Abyssinian bird has the chin and upper throat pale 

 tawny. Both differ from a female from Bumba, Belgian Congo, 

 in that the latter lacks the white band on the nape, has the bands 

 demarkating the facial disk light buffy, not white, and has the sides 

 of the face darker brown than in either of the former. The Congo 

 bird is slightly darker than the Abyssinian one, especially on the 

 underparts. 



In the adult males, the only color character that varies consider- 

 ably is the extent of the black area on the inner web of the next to 

 the outermost primary. In some it does not extend proximally as 

 far as the tip of the outermost primary; in others, far beyond it. 



The spring migration dates of this hawk in Ethiopia and Somali- 

 land are from January to February ; the fall migration, from Octo- 

 ber to November. 



GYMNOGENYS TYPICUS TYPICUS (Smith) 



Polyboroides typicm A. Smith, S. Afr. Quart. Journ., ser. 1, p. 107, 1830: 

 Eastern Cape Province. 



Specimens collected: 



Female adult, Alaltu, Ethiopia, January 17, 1912. 



Female adult, Anole Village, Ethiopia, May 18, 1912. 



Mearns made the following notes regarding the colors of the soft 

 parts. "Side of face (bare skin), deep yellow; cere and base of 

 bill, all around, fleshy white; bill black; feet yellow, claws black." 

 An interesting note was made to the effect that the heel joint works 

 both ways in this hawk. 



Both birds collected were molting the remiges at the time. The 

 bird from Alaltu still has the old, immature, four outermost pri- 

 maries in the left wing and the three outermost ones in the right 

 wing, while the specimen from Anole Village still has the old two 

 outermost primaries in the left wing and the outermost one in the 

 right wing. It also has several brownish secondaries. It is rather 

 curious that the molt should be more advanced in the right wing 



