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



d,e. S ? ad. Porto Esperan9a, Brazil. Oct. 13, 1909. 



f,ff. S ? ad. Colonia Mihanovitch, N. Argentine. Nov. 5, 

 1909. 



Irides haxel ; bill, legs, and toes black. 



The November birds are shewing signs of wear and 

 fading ; and the female on dissection was found to be 

 laying. 



The December bird is starting to moult on the back, and 

 the March bird is in full moult and has almost assumed the 

 new feathering on the body. 



A rare visitor to the Ajo district, only four being observed 

 there during both my visits. 



On the river expedition not many were seen altogether, 

 though at Porto Esperan9a quite a number were about, which 

 I think had only just arrived there. 



101. MiLVULUS TYRANNUS. 



Milvulus tyrannus Scl. Cat. B. xiv, p. 277; Arg. Orn. i. 

 p. 160. 



a, b,c.S^ ad. Los Ynglases, Ajo. Oct. 21-27, 1908. 



d. ? ad. „ „ Jan. 7, 1909. 



e. ? ad. „ „ Jan. 19, 1910. 

 /. S ad. Pan de Azucar, Brazil. Sept. 19, 1909. 

 Irides hazel ; bill, legs, and toes black. 



The Scissor-tailed Tyrant is a summer visitor to the Ajo 

 district, making its appearance about October and leaving 

 again towards April. 



The males appear to arrive first, followed soon after by the 

 females, when breeding operations are commenced, the nest 

 being almost invariably placed on the outside branches 

 either of solitary trees or of those on the edge of the montes, 

 generally in rather conspicuous positions and between from 

 ten to twenty feet from the ground. The fabric is placed 

 on some horizontal branch or in a fork ; it is cup-shaped in 

 form, and composed of thistle-down, grass, and wool, the full 

 clutch of eggs being four. 



As a rule, this bird is seen perched on wire fences or 

 on the tops of plants in the open camp from which 



