( 298 ) 



(a) R. poUocephaliis poliocephalus Tacz. 



Rhijifhncycliis jiolioeephalus Taozxnowski, Oni. Peroii ii. p. 285 (1884. — Nauta, N.E. Peru ; type in 

 Mas. H. T. Berlepsoh) ; Sclater, Cat. Birds lirit. Mas. xiv. p. 171 (part.). 



R. mfyacephalui (iiec Swainson) Sclator & Salviu, Pro'. Ztnl. Sor. Land. 1866. p. 189 (Upper 

 Ucayali ; vidi) ; iidem, l.r. 1867. p. 751 (Xeb3ro5: vidi) ; iidem, I.e. 1867. p. 978 (Pebis) ; 

 iidem, I.e. 1S7:1 p. 280 (E. Peru) ; iidem, ;..-. 1873. p. IKo (Cosnipata, S.E. Peru) ; Taozanowski, 

 I.e. 1882. p. 20 (Yurimiiguas) ; idem, Ora. Perou ii. 1884. p. 283 (part. : Peru). 



R. pnlincrphalw imlioeephahix Hellmayr, Nuc Zonl. xiv. 1907. p. 48 (Teffe). 



llab. N.W. Brazil : Teffo, Rio Solimoeas (Hoffinanns). North-Easteni Peru : 

 Upper Ucayixli, Xeberos (Bartlett), Yurimagnas (Stolzmaan), Pebas, Nanta (Haax- 

 well). S.E. Peru: Cosnipata (Whitely). Eastera Ecuador: Nap') (spec, in 

 Mns. H. V. B.). 



Character.^. The slate-grej' cap decidedly mi.xed with olive-green, back brighter 

 green. Lower parts rather bright yellow, throat scarcely jialer than the rest. — • 

 Wing (c?) 56— oS, (?) o2-o5 ; tail (t?) 47, (?) 4'J— 45 mm. 



Examined : 1 adnlt, Nanta (type) ; 1 ? ad.. East Ecuador, in Mns. H. v. B. ; 

 1 6 ad., Upper Ucayali, July 7, 1865 ; 1 <S ad., Xeberos, June 6, 1866 (E. Bartlett 

 coll.); 1 ? ad., Teffe (Hoffmanns), all three in the Tring Jlnsenm. 



(h) Ii. poh'ocep//ali's sclateri Hellm. 



R. pnliocephalux seluteri Hellmayr, Verliandl. Znol. Bol. Gen. Wieii liii. p. 207 (1903. — Barra do Rio 



Negro ; crit.) ; idem, Nov. Zwil. xiii. 1906. p. 361 (Prati, Pani) ; Snethlage, Jonrii. f. Ornilh. 



1908. p. 527 (Arumatheua, Tocantins) ; Berlepsch, .Viii\ Z'tnl. xv. 1908. p. 131 (Cayenue). 

 H. sulphiiresceiis (errore 1) Sclater & Salvin, Proc. Zonl. Snc. Loiid. 1867. p. 578 (Para : vidi). 

 B . pnlinaphabia (nom. nud.) Pelzeln, Znr Orii. Bras. ii. 186S. p. 110 (Barra do Rio Negro, Mara- 



bitanas, Rio Negro ; Bahia— vidi) ; Sjlater, Cat. Birds Brit. Mua. xiv. p. 171 (part. : specimen 



ex Pari— Liyard : vidi) ; Berlepsch & Hartert, Xnr. Zool. ix. 1902. p. 47 (part.* : Nericagua, 



Maipures, Suapure). 

 if. megaeephahis (errore) Layard, Ihis 1873. p. ,383 (Para: vidi) ; Taozauowski, O™. Permi ii. 1884. 



p. 283 (part. : Cayenne) ; Salvin, Jbis 1886. p. .501 (Rio Carimang, Brit. Guiana) ; Sclater, 



Cat. Birds Brit. Mus. xiv. p. 170. 

 if. klagesi Ridgway, Proc. Biol. Soc. Wash. xix. p. 115 (1906. — Maripa, Caura, Venezuela). 



Bab. North Brazil : Arumatheua, on the R. Tocantins (Snethlage) ; Pard 

 (Layard, "Wallace), S. Antonio do Prata, near Para (Hoftmanns); Marabitanas and 

 Barra (= Mauii/w), on the Rio Negro (Xatterer) ; Calama, Rio JLvleira (Hoffmanns). 

 East Brazil: Bahia (Karamerlaciier coll., Mus. Vindob. ; Mns. Brit.f). Cayenne 

 (CJherrie, Jelski). Surinam: near Paramaribo (Chnnkoo coll. in Mus. Tring). British 

 Guiana: Mernme, R. Carimang, Onrumee (Whitely). Venezuela: Nericagua and 

 ]\Iaii)ures, R. Orinoco (Cherrie); Suapure, Maripa, Caura R. (Klages). 



Character.^. Cap nearly uniform slate-grey or very slightly suffused with 

 olive-green ; back duller green than in R. p. poliocephalus. Lower parts pale 

 yellow, underlaid with pale greyish on the chest ; throat and foreneck greyish 

 white or, at least, strongly suffused with whitish. 



Wing (S) 55—6(1, (?) 52—57 ; tail (c?) 45— 52, (?) 42-45 rara. 



Ohs. I am unable to discover any constant differences, connected with distri- 

 bntion, among a large number of skins from various localities. 7?. klageni is clearly 

 a synonym of tsclateri, examples from the Caura being in every respect identical 

 with the types. Moreover, Mr. Ridgway compares his alleged new form only with 

 R. .Hiilphurexceii.'i, from which it is, of course, quite distinct. 



* The examples from La Pricion. Caura. turn out to belong to R. i. fulphumeens. 

 ■f II. megaciphalus Sclater, Cat. Birds Brit. Mmt. xiv. p. 170: specimen a. 



