120 LIST OF DIITENAL BIRDS OF PREY. 



I may add^ Avith reference to another allied species, Micras- 

 tur zonothorax, that I have only seen one adult specimen of 

 this scarce Hawk. This example, which is in the collection of 

 Messrs. Salvin and Godman, and was recorded in the P. Z. S. 

 for 1873, p. 511, was obtained in Venezuela by Mr, Spence, 

 and marked by him as a male ; it differs from the normal 

 adult plumage of M. ruficollis in the crown of the head, 

 though tinged with brownish grey, being less distinct in that 

 respect from the rufous colour of the mantle than is usual 

 in M. 7'uficollis, also in the chocolate-brown on the sides of 

 the neck and on the throat being less rufescent than in 

 M. ruficollis, and especially in its being strictly limited to 

 the throat, not descending to the jugulum or upper breast 

 as in the adults of M. ri(ficollis. 



Mr. Spence also obtained in Venezuela an immature spe- 

 cimen, which is probably referable to this species, and which 

 is preserved in the collection of Messrs. Salvin and Godman; 

 it bears a considerable resemblance to the immature plumage 

 of M. ruficollis, but it is more strongly and more regularly 

 barred on the under surface than is usual in the young birds 

 of that species, and it is also, like the adult, browner and less 

 rufous on the sides of the neck. The sex of this specimen has 

 not been noted, but it would seem, from its measurements, 

 to be a male. 



Messrs. Salvin and Godman possess another very similar 

 young bird, apparently also referable to M. zonothorax, from 

 Porto Cabello in Venezuela, whence were obtained the type 

 specimens of this species now preserved in the Museum of 

 Berlin. This example chiefly difl'ers from that last men- 

 tioned in the transverse bars on the under surface being 

 narrower and in the interspaces being much tinged with 

 yellowish buff, except where a few feathers of the adult 

 plumage have appeared on the upper breast and show white 

 interspaces between rather broad black cross bars. This spe- 

 cimen has been labelled by the collector as a female, obtained 

 on 29th August, and havmg the irides " grey-brown." 



The following are the measurements which I have taken 

 from the last-named three specimens : — 



