of the Lower Pilcomayo. 129 



its voice is restricted to a harsli scream, not possessing the 

 variety of that of C. chrt/sops. 



44). T/ENIOPTERA NENGETA. [Op. cit. I. p. 114.) 



(No. 66, (?.) Near Fortin Donovan. April 21st, 1890. 



Frequent. Generally to be seen perched on the summits 

 of dead jaalm-stems, in the low open grounds bordering 

 lagunas, whence it makes sallies after insects. This is one 

 of the species which always collect in large numbers round 

 the great camp-fires, to capture the insects frightened up out 

 of the grass. 



45. TiENIOPTERA DOMINICANA. {Op. cU. i. p. 117.) 



Fortin Page. August 2nd, 1890. 



46. T^NIOPTERA IRUPERO. [Op. Clt. \. p. 118.) 



Very frequent in the ojjen places, where it is very conspi- 

 cuous, as it sits motionless on the summit of a bush, tempt- 

 ing one to believe that the brilliant white colour has been 

 developed for the purpose of attracting its insect-prey. 



Like T. nengeta, this species always collects in numbers 

 round the camp-fires. 



47. FlUVICOLA ALBIVENTIIIS. {Op. Clt. i. p. 121.) 



(No. 90.) Occasionally seen hopping about among the 

 drift wood at the water's margin, but not common. 



48. Arundinicola leucocephala. {Op. cit. i. p. 122.) 

 Rare ; found in reed-beds. 



49. SisoPYGis icterophrys. {Op. cit. i. p. 125.) 

 (No. 145, S ') Fortin Page. July 21st, 1890. 



50. Cnipolegus cinereus. {Op. cit. i. p. 128.) 



(No. 389, ? .) A single female of this species was ob- 

 tained on the Pilcomayo. 



51. LiCHENOPS PERSPICILLATUS. {Op. cit. \. p. 129.) 



(No. 180, ? .) Fortin Page. August ]8tli, 1890. 

 Frequent, but by no means so abundant as it is in the 

 Pampas. 



SER. VI. VOL. IV. K 



