( 50 ) 



Back aud rnmi) olive-grey, with a, distinct greenish cast on the mantle ; last 

 nropygial feathers with whitish tips ; Tipper tail-coverta dark sooty-brown, with 

 narrow cinereons edges. Throat and breast pale smoky greyish, the latter slightly 

 tinged with yellowish ; abdomen white ; under tail-coverts brown with whitish or 

 yellowish white edges. Upper wing-coverts broadly tipped with whitish or greyish 

 white. 



Wing (ten specimens) 93—09 ; tail 85—89 ; bill 18—20 mm. 



(3) <S'. sihilator atimaslus Oberholser. 

 Proc. U. S. Nat. Miis. xxv. p. 66 (1902.— Chapada, Mattogrosso). 



Chapada, Mattogrosso. 



Upjier parts as iu the preceding form, but the yellowish white tips to the 

 rnrap-l'eathers more conspicnous. Throat aud foreneck clear ciuereous ; breast, 

 abdomen, and under tail-coverts pure white. Upper vring-coverts as in & s. 

 sibilator, broadly tipped with whitish or greyish white. 



Wing (three specimens) 89—96 ; tail 80—87 ; bill 181-10 mm. 



(e) <S. sibitator albocinereus Scl. & Salv. 

 Siryistes albocinereus Sclater & Salvin, P.Z.S. Land. 1880. p. 156 (Bogotd coll.). 



Upper Amazonian district : Colombia (Bogota coll.) ; Eastern Ecuador : 

 Sai-aya(;u (Buckley) ; Eastern Peru : Santa (Jruz (Bartlett), Ljuitos (Whitely), etc.; 

 N.W. Brazil : Bom Lugar, Rio Funis. 



Differs from the two foregoing forms by having the mantle clear cinereous 

 without any olive tinge, and the rump find all the uuder-surface pure white, there 

 being but a faint cinereous wash on the throat. The wing-coverts are almost 

 uniform dusky brown, only a few with very narrow whitish apical margins, and the 

 white edges to the secondaries are less distinct and narrower. Axillaries and 

 under wing-coverts pure white (not pale yellowish grey as in -S'. s. sibilator 

 and S. s. aiimastus). 



Wing (six specimens) 92—99 ; tail 80—89 ; bill 18^^-20 mm. 



76. Pitangus sulphuratus bolivianus (Lafr.). 



[LaniKS stilphuralas Linnaeus, Synt. Nat. xii. 1. p. 1.37 (1766. — ex Brisson : Cayenne).] 

 Siiuriiplmijidi boVivianus Lafresnaye, Hce. Hag. Zool. 1852. p. 46,3 (Chuquisaca, Bolivia). 

 Pitanffus Maximiliani (nee Saurophagus ilaxim'tUani Cab. & Heine) Peizuln, Zur Oni. Bni--^. ii. 

 1868. p. Ill (Cidade de Goiaz). 



No. 2143. S ad., Rio Thesouras, May 190G.— Wing 122 ; tail 95 ; bill 3Ui mm. 



No. 2221, 2330. c? S ad., Rio Araguaya, June, July 1906.— Wing 118, 114; 

 tail 90, 87 ; bill 30, 28 mm. 



No. 1847. ¥ imm., Goyaz, March 1006.— Wing 113 ; tail 85 ; bill 28 mm. 



The series agrees well with specimens from Tucuman aud other localities iu . 

 Western Argentina. Typical birds from Bolivia are not available for comparison. 



Specimens from Bahia, Rio de Janeiro, aud S. Paulo arc smaller, especially 

 the wing being shorter, aud the upper parts are a clearer lirown. This is 

 1'. sulphuratus maxitniliani (Gab. & Heine). 



As to the intensity of the yellow on the belly, there is considerable variation 

 to be observed. Baer's examples from Rio Thesouras and Rio Araguaya are q[uite 



