N.W. Argentina and the Bolivian Chaco. 469 



63. Thamnopiiilus major Vieill. 



A male specimen, the only one observed, was shot at 

 Tatarenda. Although otherwise agreeing with the description 

 in the Cat. Birds Brit. Mus., it is distinguished by its remark- 

 ably long tail, which measures 90 mm. 



64. Xiphocolaptes MAJoit (Vieill.). 



Tatarenda, April 1902. The belly of this specimen is 

 quite unspotted. It is met with only in the palm-woods 

 and resembles a Woodpecker in flight and habits. It has a 

 sharp whistling note. 



65. T^nioptera irupero (Vieill.). 



Several specimens were procured at Tatarenda in March 

 and April, and at Pilcomaya in April 1902. 



This bird usually sits at the top of a tree that stands alone 

 in some open place. Now and then it is seen to fly up in the 

 air and catch some passing insect, but it always returns to 

 the same twig. It is not impossible that the white colour of 

 the plumage of this bird may attract insects in the same way 

 that the yellow throat of Merops apiaster (which the author 

 has watched in Transcaucasia) gives one the impression of a 

 yellow flower, when the bird sits on the ground. 



66. Machetornis rixosa Vieillot. 

 Tatarenda, March 2 1st, 1902. 



67. Empidagra suiriri (Vieillot). 



Specimens from Fortin Crevaux and Tatarenda, April 

 1902. 



68. Pyrocephalus rubineus (Bodd.). 

 Tatarenda, April 1902. 



-r-69. Myiarchus tyrannulus P. L. S. Mull. 

 Tatarenda, April 1902. 



70. Empidonomus aurantio-atro-cristatus (d'Orb. et 

 Lafr.). 



Tatarenda, April 1902. 



71. Pitangus bolivianus (Lafr.). 



A young specimen from Fortin Crevaux, shot in April 1902, 



