80 BULLETIlSr 117, UNITED STATES NATIONAL. MUSEUM. 



(201Sa) MICRORHOPIAS RUFA RUFATER (Lafresnaye and d'Orbigny). 



Thamnophilus rufater Lafresnaye and d'ORBiQNY, Syn. Av., 1837, vol. 1, p. 12 



(Chiqiiitoseni, Bolivia). 

 Formicivora rufatra Sclater and Salvin, Proc. Zool. Soc, 1876, p. 16 (Maranura). 

 Formicivora rufa rufatra Berlepsch and Stolzmann, Ornis, 1906, p. 94 (Santa 



Ana). 



The males are less rufous above but of practically the same size as 

 one from Sao Paulo. 

 Santa Ana, 1 male, 1 female; Chauillay Bridge, 1 male, 1 female. 



(202Sa) MICRORHOPIAS BICOLOR, subspecies. 



An adult male is intermediate between quixensis and hicolor but 

 is larger and with a much heavier bill than either. It doubtless 

 represents an undescribed race. 



Rio Comberciato, 1 male. 



(2055) CERCOMACRA TYRANNINA APPROXIMANS Pelzeln. 



Cercomacra approximans Pelzeln, Orn. Bras., 1868, pp. 85, 158 (Engenho do 

 Cap Gama). 



Two immature specimens are provisionally referred to this form 

 of ^ which I have seen no authentic specimens. 

 Rio San Miguel (4,500 feet), 1. 



(2179) GRALLARIA SORORIA Berlepsch and Stolzmann. 



"^ Grallaria sororia Berlepsch and Stolzilann, Ornis, 1901, p. 194 (Idma, Peru); 

 1906, p. 94 (Idma). 



(2192) GRALLARIA ERYTHROLEUCA Sclater. 



Grallaria erythroleuca Sclater, Proc. Zool. Soc, 1873, p. 783 (Hnasampilla, Peru). 



These^specimens are from near the type locality. 

 Occobamba Valley (9,100 feet), 3. 



(2198) OROPEZUS RUFULA OBSCURA (Berlepsch and Stolzmann). 



Grallaria rufula obscura Berlepsch and Stolzmann, Proc. Zool. Soc, 1896, p. 385 

 (Maraynioc). 



Traps which Heller set for small mammals proved effective in 

 securing an excellent series of this form in the humid Temperate Zone. 

 Berlepsch and Stolzmann based their description on a single specimen 

 "W^ich was compared with an evidently inadequate series of true rufula. 

 The'^tter race, as stated in my paper on Colombian Birds,*" shows 

 much .ariation, having what might be termed fulvous and rufous 

 phases. The latter is the rarer and is shown by only 2 of our 19 

 specimen&(rom Colombia and Ecuador. Both are from near Bogota 

 where, hmSyer^ the rufous phase is also represented. It was evi- 

 dently wlth^^J^Q fulvous phase that the comparison of ohscura was 

 made^smce^a^^yp Peruvian specimens are much paler than rufous 



«BuU. Amer. Mus. NV^j^t., vol. 38, 1917, p. 397. 



