1918.] Hawks of the Genus MicTdLstur. 347 



Micrastur ruftcoUis zonothorax. 

 Climacocercus zonothorax Cabanis, J. f. O. 1865, p. 406 : 

 Porto Cabello, Venezuela. 



Distribution. Venezuela and possibly eastern Colombia. 



Micrastur plmnbeus. (Plate VIII.) 



Micrastur plmnbeus W. Sclater, Bull. B. O. C. xxxviii. 

 1918, p. 44 : Prov. Esmaraldas, N.W. Ecuador. 



The following is a reprint of the description : — 



" Resembling in general colour M. gilvicollis from the 

 Amazon basin, but very much greyer above, the crown and 

 mantle bluish grey, becoming blacker on the rump and 

 tail; below, the transverse banding extends from the throat 

 to the thighs, but not apparently to the under tail-coverts, 

 and is composed of alternate bands of white and plumbeous 

 rather than white and dusky ; the throat and neck are un- 

 handed plumbeous. The tail is very short compared with 

 other species of the genus, and has only one cross-band of 

 white about the middle of its length, though there are traces 

 of another cross-band concealed by the coverts. In the 

 other species of the genus there are always two, often three, 

 such bands. 



"Iris light brown to yellowish grey, feet orange-red to 

 yellow, bill blackish with a yellow cere.^' 



Type, a male from Carondelet, Rio Bogota, Prov. Esmar- 

 aldas, N.W. Ecuador, about 450 feet elevation. Collected 

 by Messrs. Miketta and Fleming, 23/iii./1901. B.M. Reg. 

 no. 1902/5/5/62. 



Measurements of type : Length about 330 mm., wing 178, 

 tail 125, tarsus 64, bill (without cere, measured straight Avith 

 dividers) 15. In a female the wing is 167, the tail 120. 

 The tail of M. r. gilvicollis averages 153 mm., against a wing 

 of 180 mm. 



There are in the British Museum two other examples 

 from the same district, collected by Messrs. Miketta and 

 Fleming. Another younger bird with only the breast 

 transversely marked, in the Tring Museum, was obtained 

 by the same collectors in the same region. 



