134 BROOKLYN INSTITUTE MUSEUM. SCIENCE; BULLETIN 2. 6. 



species actually represented in the Brooklyn Museum collections 

 included, but also all additional forms that were collected or observed 

 on my first expedition to the Orinoco ; while, to make the paper more 

 complete, and particularly in the interest of those who may not have 

 access to Berlepsch and Hartert's paper "On the Birds of the Orinoco 

 Region,^" there are added all species from the Orinoco proper, and 

 its tributary the Caura River, included in that paper, but not ob- 

 served by the writer. Also, species that have been recorded from the 

 Orinoco region, since the publication of Berlepsch and Hartert's paper, 

 and that have come to the notice of the writer are included. 



Where colors are given of the eye and naked parts about the head, 

 of the bill, and of the feet, they are the result of a direct comparison 

 with the colored plates in Ridgway's "Nomenclature of Colors" and 

 were made in the field from freshly killed specimens. 



For almost all groups "keys" for the more ready determination of 

 the various genera, and their species, have been inserted, following the 

 preliminary observations under each of the family headings. Many of 

 these keys, with slight alterations, were prepared by the writer for his 

 convenience in the identification of specimens in the field. And while 

 the keys were constructed primarily as aids in identifying the species 

 known to inhabit the immediate valley of the Orinoco, there are 

 frequently included the necessary "characters" distinguishing many 

 species known to be found in contiguous territory. It must be under- 

 stood, however, that no effort has been made to supply "keys" to the 

 birds of other regions of northern South America. 



The nomenclature and determination of species is much the 

 same as that employed by Berlepsch and Hartert in their paper 

 which was based chiefly on the collection made in the same region by 

 Mrs. Cherrie and myself in 1897 to 1899, and the Andre and Klages 

 collections from the Caura River district. 



The references to Berlepsch and Hartert, unless specifically noted 

 to the contrary, are to their paper, and the nomenclature where not 

 otherwise indicated is the same. 



TURDIDAE— THE THRUSHES. 



Six thrushes are found 'on the Orinoco : five are resident forms of 

 the genus Planesticus and one a North American migrant of the genus 

 Hylocichla. The latter is probably never found in juvenal plumage 



'Novitates Zoologicae IX. 1902. p. 134. 



