Paraguay, Bolivia, and Southern Brazil. Ill 



74. TiENIOPTER> IRUPERO. 



"^^Jiioptera irtpero Scl. Cat. B. xiv. p. 13; Arg. Orn. i. 

 p. 8. 



c ^ ad. T'lyru, Paraguay. Aug. 5, 1909. 



b. ? ad. Villa Franca, Paraguay. Aug. 5, 1909. 



c ? ad, (Jolonia Mihanovitch, N. Argentine. Aug. 12, 

 I90r> . 

 p^Jrides brown ; bill, legs, and toes black. 



Many of this " Widow-bird " were seen on the river 

 expedition, always alone and perched on the tops of 

 solitary bushes, whence they fly off to take passing insects. 



75. Fluvicola albiventris. 



Fluvicola albiventris Scl. Cat. B. xiv. p. 36 ; Arg. Orn. i. 

 p. 121. 



a. S ad. Colonia Risso, Paraguay. Sept. 8, 1909. 



li'ides hazel ; bill, legs, and toes black. 



Quite a number of these birds were seen frequenting the 

 wLter-weeds and vegetation on the river-banks. When on 

 the ground at first sight they look like Wagtails. 



7Q. Arundinicola leucocephala. 



Arundinicola leucocephala Scl. Cat. B. xiv. p. 37 ; Arg. 

 Orn. i. p. 122. 



a, b, c. c? ? ad. & young. Monte Alto, Paraguay. 

 Aug. 25, 1909. 



d. c? young. Alto Paraguay, Bolivia. Oct. 17, 1909. 



Iris hazel ; bill, legs, and toes black, base of lower 

 mandible pale yellow. 



The adult male and female are rather worn. 



The August young male is similar to the adult female, but 

 rather paler, and has some long white feathers on the head. 



The October young bird is more advanced, having almost 

 assumed the white head, and black feathers are rapidly 

 replacing the cinereous dress of the back and wings and the 

 white of the under parts. 



This bird was first observed at Monte Alto and occasionally 

 afterwards to the northward, but was by no means common. 

 It frequented the sandy shores of the river and lagoons, 

 and perched on any outstanding piece of driftwood. 



