130 Mr. C. H. B. Grant on Birds collected in Argentina, 



117. SiPTORNIS SULPHURIFERA. 



Siptornis sulphm-ifera Scl, Cat. B. xv. p. 69. 

 Synallaxis sulphurifera Arg. Orn. i. p. 185. 

 a. ? ad. Los Ynglases, Ajo. Dec. 27, 1908. 



6, c. <^? ad. &juv. „ ,y Jan. 4, 1909. 



d. ? juv. „ „ Feb. 7, 1909. 



e. ? juv. „ ,, Mar. 13, 1909. 

 f,ff. S ^ young. „ „ Feb. 3, 14. 1910. 

 Ad. Irides pale brown ; bill horn-coloured, base of lower 



mandible flesh-coloured ; legs and toes purplish brown. 



Young. Irides very pale brown ; bill horn-coloured, base 

 of lower mandible and gape yellow ; legs and toes darkish 

 purplish brown. 



Both the adults are much worn, the male having been 

 taken with the nest and eggs. 



The young birds differ from the adults as follows : — 

 "Above fawn-brown; forehead and superciliaries dark buff; 

 ear-coverts, cheeks, and whole under side bright buff, with no 

 sulphur-yellow spot in the middle of the throat.''' 



A fairly common species, which frequents the canadons, 

 where it also breeds, the nest being a dome-shaped structure 

 of dry grass with the entrance-hole at the side, suspended 

 in the thick grass or rushes ; three eggs apparently make 

 the complete clutch. 



118. Siptornis hudsoni. 



Siptornis hudsoni Scl. Cat. B. xv. p. 70 ; Arg. Orn. i. 

 p. 186. 



G, b, c. ,$ ^ ad. Los Ynglases, Ajo. Nov. 10-30, 1908. 



d, e. (^ young. „ „ Dec. 1, 1908. 



f,g. S ad. Cape San Antonio. Dec. 17-21, 1908. 



h. ? ad. Los Ynglases, Ajo. Jan. 21, 1909. 



i,j. c? ? ad. „ „ Feb. 4, 1909. 



k. S young. „ „ Mar. 21, 1909. 



Young. Irides hazel ; bill horn-coloured, yellow at gape ; 

 legs and toes ashy flesh-coloured. 



The December adults are worn and liave almost lost the 



