BIRDS OF ARGENTINA, PARAGUAY, URUGUAY, AND CHILE 429 



Skins from Bolivia and Matto Grosso are often paler than typical 

 hwneralis^ but on the whole agree very well. With more material 

 from Brazil it is possible that maniiribe may be recognized as dis- 

 tinct, though I consider this doubtful. 



2. MYOSPIZA HUMERALIS MERmANA Todd. 



Myospiza hioiicruUs mcridanus Todd, Proc. Biol. Soc. Washington, vol. .30, 

 July 27, 1917, p. 127. (Guarico, Lara, Venezuela.) 



Similar to humeralis but general coloration darker, pileum more 

 heavily streaked with black, especially in front; gray edging of 

 feathers of back less prominent, with brown more conspicuous; pre- 

 vailing tone of upperparts brown, not black as in columhiana. 



Specimens seen from Colombia (Palmar, Boyaca, and Paramo de 

 Macatama, 2,800 meters) and British Guiana? (Mount Roraima?). 



The present subspecies is intermediate between cohunhiana and 

 humeralis. Two specimens from Mount Roraima, British Guiana, 

 with a distinct wash of brown on sides and upper surface, are placed 

 here tentatively but they do not fit well in any series. They are 

 much browner than any others seen. 



3. MYOSPIZA HUMERALIS COLUMBIANA (Chapman). 



Mj/ospiza manimbe colutnbinna Chapman, Bull. Amer. Mus. Nat. Hist., 

 vol. 31, July 23, 1912, p. 162. (Call, Cauca, Colombia.) 



Similar to humeralis but averaging darker, much more heavily 

 streaked with blackish above. Darker than mendana. 



Specimens seen from Colombia (Cali, Cauca; Yumbo, Valle.) 



4. MYOSPIZA HUMERALIS DORSALIS (Ridgway). 



Coturniculus manimbe, var. dorsaUs Ridgway, in Baird, Brewer, and 

 Ridgway, Hist. North American Birds, vol. 1, 1874, p. 549. (Buenos 

 Aires.) 



Without distinct rufescent or brownish markings above, prevail- 

 ing tone of upperparts gray and blackish, very distinct from the 

 reddish northern forms. Specimens seen from Paraguay (Puerto 

 Pinasco) ; Argentina (Riacho Pilaga, Formosa; Las Palmas, Avia 

 Terai, and General Pinedo, Chaco; Concepcion del Uruguay, Entre 

 Rios; Buenos Aires, Guamini, and Carhue, Buenos Aires) : Uruguay 

 (Montevideo and Lazcano) ; and Rio Grande do Sul (Santa Maria). 



This form was indicated originally as from Buenos Aires and 

 Uruguay. The type-specimen in worn breeding dress, collected by 

 J. K. Townsend, was taken at Buenos Aires. Myospiza Tnanimhe 

 nigrostriata Cherrie -'^ is identical with the present form as is shown 

 by examination of the type specimen. 



s' Bull. Amer. Mus. Nat. Hist., vol. .35, May 20, 191G, p. 189. (Rio Negi-o, a small 

 tributary of the Rio Pilcomayo, entering 35 or 40 miles from its mouth, Paraguayan 

 Chaco.) 



