Mr. R. B. Sharpe's Catalogue 0/ Accipitres. 159 



and also further south ; ' The Ibis ' for 1878 contains a record 

 of its nesting in Patagonia at p. 398, and in Texas at 

 p. 487. 



Mr. Sharpe has adopted for the next species the specific 

 name of " albigularis ;" but that of " r'ufigularis ," which is 

 also referable to it, and which is to be found on the same 

 page of Daudin^s work, has been much more generally used, 

 and I therefore think it better to retain it. The colour of 

 the iris in this Hobby is not referred to by Mr. Sharpe ; 

 and I may therefore mention that in a specimen which Avas 

 living some years since in the gardens of the Zoological 

 Society the irides were dark brown. This beautiful species 

 is remarkable for the disparity in size between the sexes, 

 and also for the slightness of the difference in coloration 

 between the adult and immature plumage. The latter 

 feature is not alluded to by Mr. Sharpe ; but a descrip- 

 tion of it by Mr. Ridgway will be found in a footnote 

 to page 131 of the third volume of the ' Land Birds of North 

 America.^ 



The remaining American species of the genus Hi/potriorchis, 

 H. deiroleucus, has been referred by Mr. Shai'pe to the 

 " Orange-breasted Hobby " of Latham, of which " Falco 

 auraniius " of Gmelin is the equivalent ; but while it seems 

 to me doubtful what species it was which Latham intended to 

 describe under this name, it is, I think, evident that his de- 

 scription by no means accords with the characters of that 

 now under consideration, for which I would therefore retain 

 Temminck^s specific name of " deiroleucus. '' 



This is the most robustly formed and probably the most 

 powerful of the Hobbies, as is especially apparent in the 

 female bird, which, as in H. rufigularis, is considerably larger 

 than the male; and it may be considered as approaching the 

 most nearly of any of the species of Hypotriorchis to the 

 genus Falco, in the restricted acceptation of the latter term. 



In the P. Z. S. for 1874, p. 550, M. Taczanowski has 

 recorded this species from Central Peru, which extends its 

 known geographical range towards the south-west bevond 

 the limits given for it by ]\lr. Sharpe. 



