N.JV. Argentina and the Bolivian Cliaco. 455 



with each other. Finally, the pair of Saltator laticlavius 

 was shot on January 26th, 1902, and on February 6th 

 the Siptomis met with the same fate, after which the 

 nest was investigated more closely. Mr. von Hofsten then 

 found only one "sitting-place" in the nest and in it three 

 eggs of two different kinds lying together. One of these 

 is white, measuring 23*5 mm. in length and 17'5 mm. in 

 thickness. I presume that this egg belongs to the Siptomis. 

 The two others are larger, thicker, and more rounded, 

 measuring 24 mm. in length by 20 mm. in thickness. 

 Their ground-colour is greenish white, spotted all over with 

 irregular reddish-brown, or almost red, spots and with 

 fainter bluish violet or bluish-grey blotches. I suppose that 

 these beautiful eggs were deposited by the Saltator. 



The question now arises, has Saltator laticlavius parasitic 

 habits and had it in this case the intention of letting the 

 Siptomis hatch its eggs and rear its young? I do not think 

 so. If there had been only one Saltator egg in the nest 

 this might have been probable, but I think that the Saltator 

 wished to take the whole nest for its own purposes and 

 had laid two eggs. When the Saltators were killed the pair 

 of Siptomis regained the nest and began to lay eggs. 



20. Phytotoma angustirostris d'Orb. et Lafr. 



A male specimen from San Luis on January 26th, 1902, 

 and a female shot at the same place a day later. Both 

 are said to have had the iris reddish yellow (" gialla," 

 according to Salvadori, /. c.) . 



Especially in the mornings and evenings, single individuals 

 of this species were seen sitting in the tree-tops making a 

 creaking noise similar to that produced when a broken 

 branch of a tree is moved by the wind. 



21. Cnifolegus anthracinus Heine. 



Tolomosa, January 31st, 1902. Occurred in flocks. 



22. Pyrocephalus rubineus (13odd.). 



This beautiful little bird lives in trees like a Flycatcher 

 (Muscicapa). Tolomosa, January 1902. 



