new American Raptorial Birds. 173 



The bill is slaty black, slightly mottled with dirty white 

 about the edges of both mandibles. 



The tarsi and feet are olive-brown, with a tinge of yellow 

 towards the extremities of the toes. 



The specimen in the collection of Messrs. Salvin and God- 

 man, though older than that in the Norwich Museum, retains 

 nevertheless considerable portions of the immature plumage, 

 which agree with that of the younger bird, except that the 

 fulvous-brown spots on the wing-coverts and tertials are 

 somewhat larger and more conspicuous ; but the adult plu- 

 mage is showing itself on the head, back, upper breast, and 

 throat, all of which are in course of change from dai'k brown 

 to coal-black ; many feathers of the latter colour have ap- 

 peared on the crown of the head ; and it entirely pervades the 

 hinder head, nape (on which there is no trace of a nuchal 

 collar), interscapular region, sides of the neck, throat, and 

 also the upper breast, with the exception of a very few scat- 

 tered feathers of dark brown, the remains of immature plu- 

 mage not yet moulted from that part. 



Some new scapular feathers Avliich have made their ap- 

 pearance are also wholly black; and some new secondary 

 wing-feathers are black, with the exception of from three to 

 four white transverse bars on the inner web ; the flanks and 

 lower breast exhibit a few new feathers, which are black, with, 

 in some instances, two pairs of white spots, divided by the 

 dark shaft of the feather, in others a smaller number, one 

 such feather showing only a single white spot on one web. 



The remaining portions of the plumage in this specimen 

 are still immature. 



The bill is dark slate-colour, with the exception of the base 

 of the lower mandible, which is a yellow horn-colour ; and a 

 similar yellow tint pervades the tarsi and feet. 



The ] re vailing dark hues of the plumage of this Micrastur 

 have suggested for it the specific name of " amaurus," from 

 the Greek dfiavpo'i, dark. 



The second species which I have to describe is a MorpJimis 

 received from Mr. C. Buckley in December 1877, and ob- 

 tained by him at Sarayacu, in Ecuador. 



SER. IV. VOL. III. o 



