works on South American Ornithology Burmeister seems to have indicated this species under 

 the name T. crotopezus^ having been no doubt misled by Lichtcnstein's reference to Azara in his 

 original description of that species. But, as we shall presently shew, the true T. crotopezvs^ so 

 well deseribed by Prince Max., is a different species, distinguishable from the present bird by the 

 rich reddish brown of the plumage above, the more densely striated throat, and other differences 

 which we shall hereafter point out. 



In 1857, Sclater described a Thrush from Bogota, under the name Tardus ignohilis^ from 

 specimens in his own collection and in that of the Academy of Natural Sciences of Philadelphia. 

 After carefully comparing the New Granadian bird with a scries of skins from other localities, 

 we are now of opinion that there are scarcely sufficient grounds for separating it fi'om the present 

 species. The only points of difference are the lighter coloured lores, and somewhat darker 

 breast in some specimens. But in more recently obtained examples, these distinctions do not 

 seem to be constant. 



How d'Orbigny came to make the mistake of regarding this Thrush as the female of 

 T. rufiventn's, we cannot explain ; suffice it to say that, as Burmeister observes, they do not 

 even inhabit the same sort of country ; T. rufiventris being a forest-loving sjjecies, whereas the 

 present bird seems to be peculiar to the Campos, and more open districts. 



As will be seen by the list of localities above given, as well as from what has been 

 already stated, the range of Azara's Thrush In South America is very extensive, stretching from 

 New Granada and Ecuador In the north to the Pampas of Buenos Ayres In the south, but from 

 what has been recorded of Its habits, it would appear to shun the densely wooded districts and 

 to occur only In the savannas. In the vicinity of Lagoa Santa, where Burmeister tells us that 

 it Is by no means scarce. Its terrestrial habits are stated to cause it to be subject to the attacks 

 of the "jigger" fFulex penetrans J — a well-known pest of the American tropics. 



Our figure of this species is taken from a skin in Sclater's collection, which from the mode 

 of its preparation appears to be from Cayenne. 



Decembeb, 1868. 



[144] 



