125 
Paraguay , Bolivia, and Southern Brazil. 
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 Bunnacles' first record of the appearance of this species 
for 1909 in the Ajo district is October 11th. 
102. Tityra brasiliensis. 
Tityra brasiliensis Scl. Cat. B. xiv. p. 329. 
a. S a d. Coimbra, Brazil. Oct. 15, 1909. 
Irides brown; bill deep slate-coloured, base and orbits 
dull crimson; legs and toes dark slate-coloured. 
103. Platypsarxs atricapillus. 
Hadrostomus atricapillus Scl. Cat. B. xiv. p. 333. 
a. S 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. $ ad. Opposite Babicho, 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. $ ad. Puerto San Juan, Paraguay. Aug. 26,1909. 
Irides hazel; bill flesh-coloured at base, horn-coloured at 
tip; 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. 
