( :^ii ) 



No. lOlO. ? pnl]., Mamins, 13. vii. 1008. 



[No. 1451. ? iium., Borba, 7. xii. 1900.— Wing 88 ; tail 65 ; bill 14^ mm.] 

 In addition to the above, I have before me Natterer's series, consisting of 

 twelve s|)ecimens, kindly lent by the anthorities of the Vienna Mnsenm ; the fonr 

 oxaiiiple-s obtained bj' Mr. Hoffmanns at Hamaytha ; three skins from the Upper 

 Orinoco (Mnndnapo, Nericagua) ; two from the Caura Valley, si.x from British 

 Guiana (.S'. /. olicaceus) ; one each from Cayenne and Surinam, and five from Prata, 

 Para {S. t. wallacii). The study of this large material revealed the fact that, 

 notwithstanding a certain amount of individual variation, three distinct races are 

 recognizable. Single specimens are not always distinguishable, yet it cannot 

 be denied that the slight colour differences are connected with geographical 

 distriliution. 



{a) S. t. amazonum (Scl.). 



Ilah. Peru: Chamicuros (Hau.Kwell, Bartlett), Yurimaguas (Stolzmann), 

 Soriano (Jelski), La Gloria (Kaliuowski), Cosnipata (\Vhitely), etc. W. Brazil : 

 Villa Maria, Engenho do Gama (Rio Guapor(5), Mattogrosso (Natterer) ; llio 

 Madeira : Hnmaytha (Hoffmanns), Borba (Natterer), Allianca, Calama, Maruins 

 (Hoffmanns) ; Rio Xie and Marabitanas, upper Rio Negro (Natterer). Eastern 

 Ecnador : Sarayaru (Buckley). Venezuela, Upper Orinoco: Mnndnapo, Nericagna 

 ((Jherrie). 



Specimens from Saraya(;'u, Orinoco, and Rio Negro have, as a rule, the back 

 brownish olive ; the cap more or less tinged with cinnamomeous ; the throat and 

 foreneck conspicuously washed with rufescent brownish ; and the remainder of the 

 under parts dark greenish olive. The series from the Rio Madeira and its headwaters 

 (Engenho do Gama, Villa Maria) are generally less brownish, more greenish olive 

 on the upper parts, and the belly is slight!}' paler, more greyish olive ; but there 

 are so many exceptions that I do not venture to separate them, inasmuch as I have 

 no topotypical Peruvian material for comparison. Several examjiles from Humaytha 

 and Calama show very little rufescent admixture on the pileum, and closely 

 approach .S'. t. ivallacii. 



Immature birds have the outer aspect of the quills decidedly rufous brown, 



while in adult ones these edges are olive-brown, or very faintly tinged with 



russet. 



(h) S. t. wallacii (Scl. & Salv.). 



llah. N.E. Brazil : Para (Wallace, Snethlage), Prata (Hoffmanns). French 

 Gniana : Saint-Jean-du-Maroni (Le Moult; Mus. Munich). Surinam: near Para- 

 maribo (Chunkoo ; Triug Museum). 



Five topotypes from near Para differ from the preceding form by purer green 

 back, with very little, if any, rufescent tinge on the crown ; paler, more greyish 

 green belly ; and by having the throat but slightly, if at all, shaded with brownish. 

 Two birds from Cayenne and Surinam are in every respect typical. As stated above, 

 some specimens from the Madeira are hardly different from ivallacii. 



{c) S. t. olivaceus Ridgw. 



Saitolliorus ulivaceus Ridgway, Proc. Hiol. Soc. Wash. xi.x. p. 118 (I'JOG. — Rio Mato, Caura, Vene- 

 zuela). 



Hal). Eastern Venezuela, Caura Valley : Mato R. (Klages), Nicare, La Pricion 

 (An Ire). British Guiana : Bartica Grove, Camacusa, R. Carimang, Roraima 

 (H. Whitely, jr.). 



