90 BULLETIN 117, UNITED STATES NATIONAL MUSEUM. 



(2720) MUSCISAXICOLA GRISEA Taczanowskl. 



Muscisaxicola gruea Taczanowski, Orn. P6rou, vol. 2, 1884, p. 213 (Maraynioc, 

 Peru). 



Agrees with the original description. 

 Above Ollantaytambo (13,000 feet), 1. 



(2729) MUSCISAXICOLA ALBILORA Lafresnaye. 



Muscisaxicola albilora Lafresnaye, Rev. et Mag. Zool., 1855, p. 60. (Type 

 locality by subsequent designation "vicinity of Santiago, Chile,") 



We have specimens of albilora^ rvjivertex, and a third unidentified 

 species, all taken at Cuchacancha, Bolivia, in June, indicating the 

 specific distinctness of these forms. One specimen each from Machu 

 Picchu and Limbani, Peru, and from Cuchacancha, Bolivia, agree. 

 I have seen none from Lake Junin. 



Above Machu Picchu (14,000 feet), 1. 



(2730) MUSCISAXICOLA RUFIVERTEX d'Orbigny and Lafresnaye. 



Muscisaxicola rufivertex d'ORBiGNY and Lafresnaye, Syn. Av., pt. 1, 1837, p 66 

 (Cobija, Bolivia [=Chilo],). — Sclater and Salvin, Proc. Zool. Soo., 1869, p. 

 154 (Tiata). 



Muscisaxicola occipitalis Ridgway, Bull. IT. S. Nat. Mua., vol. 10, 1887, p. 430 

 (Lake Titicaca). 



These specimens agree closely with about an equal number from 

 Cuchacancha (11,000 feet), near Cochabamba, Bolivia, and also two 

 from the Titicaca district. One of the latter, and another from near 

 Cuzco, have the under tail coverts tinged with rufous, a character 

 attributed to M. r. ruficrissa Cory. I have seen no specimens from 

 Cobija, "Bolivia" [ = coast of Chile]. 



La Raya, 6; Calca, 1; Ttica-Ttica, 3; above Ollantaytambo (12,500 

 ft.), 1. 



(2733) MUSCISAXICOLA MACULIKOSTRIS d'Orbigny and Lafresnaye. 



Muscisaxicola maculirostris d'ORBioNY and Lafresnaye, Syn. Av., pt. 1, 1837, 

 p. 66 (La Paz, Bolivia). — Sclater and Salvin, Proc. Zool. Soc, 1869. p. 154 

 (Tinta). 



I detect no variation in a large series from Peru, Bolivia, and 

 northern Chile. 

 Huaracondo Canyon, 2; Pisac, 2; Cuzco, 1; Ttica-Ttica, 8. 



(2735) MUSCISAXICOLA FLUVIATILIS ScJater and Salvin. 



Muscisaxicola fluviatilis Sclater and Salvin. Proc. Zool. Soc. 1866. p. 187 

 (Lower Ucayli), 1876, p. 16 (Potrero). — Berlepsch and Stolzmann, Ornis 

 1906, p. 85 (Santa Ana; Idma). 



The presence of a species of this Temperate Zone genus in the 

 Tropical Zone presents an exceptionally interesting problem in dis- 

 tribution. 



Rio Comberciato, 1. 



