Birds from British East Africa and Uganda, 239 



99. Circus macrourus. Grey Harrier. 



Accipiter macrourus Gmel. N. Comm. Petrop. xv. 1771, 

 p. 439, pis, viii. & ix. : Woronez, S. Russia. 



a. ? ad. Lake Naivaslia, 67C0 ft. Dec. 3. 



b. ? ad. Bakoro Country, 20 miles E. of Lobor Mt., 

 3600 ft. Feb. 3. 



Total length in flesh: 19^ & 19 inches. Wing- : 357 & 

 349 mm. 



Both are in good dress and a little worn. 



The males of this species and of C pijgargus are quite dif- 

 ferent, but the females are very similar, and can be separated 

 not only by the female of C. macrourus being somewliat 

 larger and having somewhat shorter legs than the female of 

 C. pygarqus, but by the character given by Sharpe (Cat. 

 Birds B. M. vol. i. 1874, p. 52) for distinguishing the females 

 of this species from C. irygargus, which is as follows : — 



The tips of the primary, coverts do not extend beyond the 

 notch on the outer web of the 2nd primary = C. pygargus. 



The tips of the primary coverts extend beyond the notch 

 on the outer web of the 2nd primary =C. macrourus. 



[Irides brown, eyelids yellow ; bill black ; cere yellow or 

 greenish 3'^ellow ; legs and toes yellow. Stomach contained 

 mice. Common.] 



100. Circus aeruginosus. Marsh Harrier. 



¥alco (Eruginosus, Linn. Syst. Nat. 12th ed. i. 1766, 

 p. 130 : Sweden. 



O" S j^v. Lake Naivasha, 6700 ft. Dec. 4. 



b. S ad. Naam River, Lakwa, 3150 ft. Feb. 16. 



Total length in flesh : ad. 21^ inches ; imm. 19 inches. 

 Wing : ad. 400 mm. ; imm. 370 mm. Weight of imm. : 1 lb. 



The immature bird is apparently in first dress and is not 

 worn. The other is apparently in adult dress and is also in 

 fresh plumage. Judging by the size of specimen b. I should 

 think it was probably a femald" though sexed as a male. 



\_Ad. Irides yellow ; bill black ; cere greyish yellow ; legs 

 and toes yellow. Imm. Irides brown ; bill black ; cere 

 greenish yellow; legs and toes yellow. Tolerably common.] 



