70 Mr. Charles Chubb on the 



This specimen had not quite completed its moult, as may 

 be seen from the fact that many of the old feathers on the 

 breast, as well as on the upper parts, have lost their webs, 

 which are abraded so that the shafts remain quite bare for a 

 considerable portion of their length. 



23. MlCRASTUR RUFICOLLIS. 



Micrastur ruficollis (part.) Sharpe, Cat. B. Brit. Mus. i. 

 p. 76 (1874) ; id. Hand-list B. i. p. 216 (1899); Ihering, 

 Revista Mus. Paulista, vi. p. 337. 



Thrasyaccipiter seminoctumis Bertoni, Aves Nuev. Para- 

 guay, p. 164 (1901). 



Sparvius ruficollis (nee Vieill.), Richmond, Proc. U.S. 

 Nat. Mus. xxxv. p. 645 (1908). 



Mr. Bertoni has described the Paraguayan bird as a new 

 form and placed it in a new genus under the title of Tkrasy- 

 accipiter seminocturnis {cf. Bertoni, /. c. p. 164), but 

 according to Dr. Ihering and Mr. C. W. Richmond it is 

 identical with Micrastur ruficollis. 



a. $ ad. Sapucay, July 5, 1904. 



Bill black ; tarsi and feet pale green in front and bright 

 yellow behind ; iris brown. 



b. <$ ad. Sapucay, August 18, 1901. 



Bill black, cere and circle round the eyes yellow ; tarsi 

 and feet yellow ; iris pale brown. 



The male bird received from Mr. Foster is in full adult 

 plumage, and compared with the specimens of M. ruficollis in 

 the National Collection is of a darker slate-colour above, as 

 also on the sides of the neck, cheeks, and ear-coverts. The 

 white bars on the tail-feathers are fewer in number, narrower, 

 and, in some cases, scarcely perceptible. The throat is 

 somewhat darker and the rufous patch on the breast stands 

 out in greater contrast. The dark bars on the under surface 

 of the body are narrower and more numerous. Total length 

 146 inches ; culmen, from base of forehead, 0*6 ; wing 65 ; 

 tarsus 2*1 ; middle toe and claw 155. 



The female is darker chocolate-brown above than any 

 females of M. ruficollis in the Museum, and has the head 

 blackish ; the white bars on the tail-feathers are narrower 



