1918.] Cape San Antonio, Buenos Ayres. 411 



Grant ; " horn-colour/' Hudson). Legs and feet greenish 

 yellow or olive (" horn-colour/' Hudson). I shot a specimen 

 once, the feet of which had the appearance as of some yellow 

 pollen or sulphur adhering to them. 



201. Synallaxis sulphurifera Burm. Yellow-marked Spine- 

 tail. 



Personally, I have no notes of my own upon this species. 

 Hudson gives a brief notice, as does Claude Grant, who 

 states it is fairly common in our district. Specimens which 

 have been brought me were shot in the grass-coverts of dry 

 swamps. 



Hudson quotes Durnford in connection with the nesting- 

 habits, and Grant's account is similar. Two eggs in my 

 possession were taken on 21 November. They are rather 

 round, pure white, and measure 19 x 15 mm. 



203. Synallaxis hudsoni Scl. Hudson's Spine-tail. 



It is more than natural that I should have little to add to 

 Hudson's account of the Spine-tail which bears his name. 

 And, to be frank, it is a species which, though quite common, 

 does not lend itself to mere cursory observation (see Hudson 

 and also Claude Grant). Where these two past masters 

 emphasize its skulking and timid habits, I may be pardoned 

 for merely referring to their obifer dicta. As far back as 

 1883 I sent Mr. Salvin a couple of skins, collected three 

 years previously "in dry durasnillo-beds" ; and since then 

 many specimens have passed through my hands. But I am 

 reduced to stating that I know it when I see it (a compli- 

 ment which it does not show much tendency to reciprocate), 

 and that I have never yet succeeded in finding a nest. 



The nesting-period, from some half-dozen authentic cases 

 furnished me, seems to occur rather late in the season — 

 8 November to 27 December. Four is the largest clutch, 

 three being apparently the general number. Hudson places 

 it at five. 



The eggs are sometimes pure white, in others there is a 

 tendency to a creamy colour or pale buff. They are bluntly 

 pointed, and average 22 X 17 mm. 



