46 BRITISH BIRDS. 



Hen-Harrier {Circus cyaneus). Out of four female speci- 

 mens : — 

 Immature, December 12th, 1892. Both ovaries nearly equal 

 in size and development ; right duct present, though 

 not so mde as the left one. 



Pallid Harrier (C. macrurus). Out of four female speci- 

 mens : — 



a. Immature, March 27th, 1890. Both ovaries well 



developed and containing numerous ova of various 

 sizes ; right oviduct present, opening into the cloaca, 

 but not so wide as the left one. 



b. March 30th. Probably not fully adult, though it 



appears a third ^^ear's bird. Both ovaries well de- 

 veloped. 



Marsh- Harrier {C. ceruginosus). Out of six female speci- 

 mens : — 

 a. A second year's bird, December 4th, 1891. Both 

 ovaries well developed ; remains of the right oviduct 

 appeared to be present, in the shape of a band. 

 h. Immature, but probably older than a. November 7th, 

 1903. Both ovaries equal in size and development. 



c. Adult, August 21st, 1908. Both ovaries well developed. 



d. January 22nd, 1910. A specimen of the blackish 



variety; apparently in a stage intermediate between 

 the immature and fully-adult bird. Both ovaries 

 nearly equal in size and development, and the right 

 duct present, but certainly not functional, being 

 reduced to a band along the kidney as far as the 

 cloaca. 



Sparrow-Hawk {Accipiter nisus). Out of seven female 

 specimens : — 



a. Adult, February 3rd, 1896. Both ovaries nearly equal 

 in size and development, with remains of the distal 

 portion of the right oviduct in the shape of a duct 

 joined to the cloaca and about 10 mm. long. 



h. A second year's bird. February 3rd, 1907. A ver^^ 

 beautiful specimen, with light margins to the feathers 

 of the upper A\ing-coverts. Both ovaries well developed 



c. Young, October 18th, 1910. Probably a bird in its 

 first \vinter-plumage ; above it is very dark brown 

 with rusty margins to the feathers, and below dull 

 white, streaked, and to some extent irregularly barred, 

 with dark brown. (This specimen was obtained in 

 Sardinia, and belongs to the small and dark Sardinian 



