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. Micrastur 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 seminocturnis Bertoni, Aves Nuev. Para¬ 
guay, p. 164 (1901). 
Sparvius ruficollis (nee Vieilh), 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 Thrasy- 
accipiter seminocturnis (cf. Bertoni, l. 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 . B ad. Sapucay, August 18, 1904. 
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 
14’6 inches ; culmen, from base of forehead, 0*6 ; wdng 6*5 ; 
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 
