Paraguay, Bolivia, and Southern Brazil. 125 



it darts out to catch any passing insect ; and it is then 

 that the bird is seen to the best advantage, and the pretty 

 action of opening and closing of the tail as it twists and 

 turns (from which it gets its name) is observed. 



The force with which the outer tail-feathers are opened 

 against the air causes them to curve, and hence when the 

 tail is fully opened the tips of the longer feathers almost 

 touch and form a semicircle. 



Miss Runnacles' first record of the appearance of this species 

 for ]909 in the Ajo district is October 11th. 



102. TiTYRA BRASILIENSIS. 



Tityra brasiliensis Scl. Cat. B. xiv. p. 329. 

 a. S ad. Coimbra, Brazil. Oct. 15, 1909. 

 Irides brown ; bill deep slate-coloured, base and orbits 

 dull crimson; legs and toes dark slate-coloured. 



103. Platypsaris atricapillus. 

 Hadrostomus atricapillus Scl. Cat. B. xiv. p. 333. 

 a. cJ ad. Cabo Emma, Paraguay. Oct. 20, 1909. 

 Irides dark brown ; bill slate-coloured, upper mandible 



very dark ; legs and toes slate-coloured. 



104. Pachyrhamphus viridis. 

 Pachyrhamphus viridis Scl. Cat. B. xiv. p. 338. 



a. S ad. Opposite Rabicho, Brazil. Oct. 10, 1909. 

 Irides hazel ; bill, legs, and toes slaty. 



105. Casiornis rubra. 



Casiornis rubra Scl. Cat. B. xiv. p. 365 ; Arg. Orn. i, 

 p. 163. 



a. S ad. Puerto San Juan, Paraguay. Aug. 26, 1909. 



Irides hazel ; bill flesh-coloured at base, horn-coloured at 

 tip J legs and toes purplish brown. 



106. Geositta cunicularia. 



Geositta cunicularia Scl. Cat. B. xv. p. 5 ; Arg. Orn. i. 

 p. 165. 



a,b. S ^ ad. Tuyu, Ajo. Nov. 27, 1908. 



