140 BROOKLYN INSTITUTE MUSEUM. SCIENCE BULLETIN 2. 6. 



Trinidad birds are so different that I have recently separated them as 

 P. ftuiiigatus aqnUonalis} 



Planesticus phaeopygus phaeopygus (Cabanis). 

 Tiirdus phaeopygus Cab. in Schomb. Reise Brit. Guiana II. 1848. p. 666; 



Berlepsch & Plartert p. 3. 



Collected on the Caura River^ by Klages (Mountains west of 

 Suapure) and by Andre (La Pricion). It is replaced in the delta 

 region of the Orinoco by the Tobagan subspecies. {P. p. pliaeopygoides.) 



Planesticus phaeopygus phaeopygoides (Seebohm). 

 Tiirdus phaeopygoides Seebohm, Cat. Birds Brit. Mus. V. 1881. p. 404 



( Tolxigo ) . 

 Turdiis phaeopygus pliaeopygoides Hellmayr, Novit. Zool. XIII, 1906. 



p. 4 (Guanoco, Orinoco Delta). 



Hellmayr in preparing his paper on the birds of Trinidad records 

 a specimen from Guanoco in the Orinoco delta, collected by Andre. 



Hylocichla aliciae aliciae (Baird). 

 Turdus aliciae Baird, Rep. Pacific R. R. Surv. IX. 1858. p., 217; Ber- 

 lepsch & Hartert p. 3. 



On my first expedition to the Orinoco the Grey-cheeked Thrush 

 was observed at irregular intervals from December until the middle 

 of April. Specimens were collected at Quiribana de Caicara and at 

 Maipures above the falls. Only solitary birds were seen. None have 

 been observed on the more recent expeditions. 



MIMIDAE— THE MOCKING BIRDS. 

 This family is represented in the Orinoco region by a single sub- 

 species of the genus Mimus and one species of the genus Donacohius. 



^ Key to the Genera of Mimidae. 



a. "No naked space on side of neck; tail graduated for less than one-fourth 



its length." 3 Mimus. 



a'. "A large naked space on side of neck; tail graduated for nearly half its 



length " ^ Donacobius. 



MiMUS gilvus melanopterus Lawrence. 

 Mimus melanopterus Lawr., Ann. Lye. Nat. Hist. N. Y., 1849. P- 35- 

 Mimus gilvus melanopterus Berlepsch & Hartert, p. 3. 



'Sci. Bull. Mus. Bklyn. Inst. I. 1909. p. 387. 



-The Caura is a tributary of the Orinoco entering from the right side, and draining a considerable 

 portion of the mountainous region between British Guiana and Venezuela. 

 'Ridgway Birds of North and Middle America, IV. 1907- P- 183. 



