254 U.S. NATIONAL MUSEUM BULLETIN 221 



Formicivora grisea rufiventris Carriker 

 Auk 63 (3): 316, July 3, 1936. 

 328964. Adult female. Cerro Yapacana, Territory of Amazonas, Vene- 

 zuela. April 7, 1931. Collected by Ernest G. Holt, Robert E. R. Blake, 

 and Charles T. Agostini. Original number 5873. National Geographic 

 Society Brazil- Venezuela Expedition. 



Genus MYRMOBORUS Cabanis and Heine 



Heterocnemis(?) hypoleuca Ridgway 



Proc. U.S. Nat. Mus. 10: 523, August 6, 1888. 

 =MyrmohoTus lugubris lugubris (Cabanis). See Hellmayr, Catalogue 



of birds of the Americas 3 : 234, 235, 1924. 

 120952. Adult female. Diamantina (near Santarem and east of the mouth 



of the Rio Tapajos) , State of Para, Brazil. July 11, 1887. Collected by 



Clarence B. Riker. Original number 67. 



Genus HYPOCNEMIS Sclater 



Ilypocnemis flavescens Sclater 



Proc. Zool. Soc. London, for 1864 (3) : 609, February 1865. 

 =Hypocnemis cantator flavescens Sclater. See Peters, Checklist of birds 



of the world 7: 223, 1951. 



207909. Adult male. Marabitanas, on the Rio Negro, State of Amazonas, 



Brazil. March 16, 1831. Collected by Johann Natterer. Original 



number 857. Received from the U.S. Fish and Wildlife Service, which, 



probably through Albert K. Fisher, acquired it from the Naturhis- 



torisches Museum, Vienna (where it was No. 15499). 



Hypocnemis flavescens is one of a number of birds described in the same 



paper, by Sclater, after a visit to Vienna, from which he brought back to 



London for his own collection an example of each of the new forms. In 



no case is a definite specimen mentioned as the type, but in each description, 



excepting only that of H. flavescens (probably by oversight), he states that 



examples are in the Vienna and Sclater Collections. If his descriptions were 



drawn up from his own single specimens, these alone would be the types, 



but it is reasonable to believe that diagnoses were in fact based upon the 



entire Natterer series from the localities named, in which case the Sclater 



skin now in the British Museum and the Marabitanas birds left behind in 



Vienna would be equivalent cotypes of H. flavescens. Our No. 207909 came 



to Washington from Vienna long after the date of Sclater's description, and 



is therefore here considered one of the types. 



Genus GYMNOCICHLA Sclater 



Gymnocichla nudiceps sancta-martae Ridgway 



Proc. Biol. Soc. Washington 21: 194, October 20, 1908. 

 =Gymnocichla nudiceps sanctae-martae Ridgway. See Peters, Checklist 

 of birds of the world 7: 228, 1951. 



