40 TYRANNIDJE. 



Alectrurus risorius, Scl. et Suds. Arg. Orn. i. p. 122. 



Alectrurus guira-yetapa, d'Orb. et Lafr. Syn. Av. i. p. 54 (1837); 

 d'Orb. Voy., Ois. p. 342; Gray in Zool. Voy. 'Beagle,' 1 p. iii. p. 51 ; 

 Bp. Gonsp. i. p. 194 ; Scl. Cat. A. B. p. 201 ; Pelz. Orn. Bras. 

 p. 98; Scl. et Salv. Nomencl. p. 43; Durnford, Pbis, 1878, p. 60 

 (Buenos Ayres) ; Barrows, Bull. Nutt. Orn. Club, viii. p. 140 

 (Entrerios) ; Gibson, Ibis, 1885, p. 279 (Paysandii). 



Muscicapa psalura, Max. Beitr. iii. p. 877 ; femm. PL Col. 286, 296. 



Yetapa psalura, Less. Tr. (TOm. i. p. 387. 



Psalidura guirayetapa, Cab. et Heine^Mus. Hein. ii. p. 43. 



Alectrurus psalurus, Burm. Syst. Ueb. ii. p. 510 ; id. La-Plata Reise, 

 ii. p. 457. 



Above black, rump grey ; front varied with white ; wings black ; 

 scapularies, outer margins of wing-feathers, and coverts white ; 

 tail black ; two outer rectrices much elongated, denuded at the 

 base, with a broad inner and no outer vane : beneath white, broad 

 band across the breast black ; throat in the breeding-season bare of 

 feathers and of a bright orange ; bill yellowish ; feet black : whole 

 length 11 inches, wing 3, tail, outer rectr. 8, middle 2. Female. 

 Above brown, wings varied with white; sides of head white: 

 beneath white, breast-band pale brown ; tail with the two outer 

 rectrices slightly elongated and denuded, terminated with spalla- 

 tions on the inner vane. 



Hub. Pampas of Paraguay, Uruguay, and Argentine Republic. 



a. d ad. sk. La Plata. Sclater Coll. 



b. J ad. sk. Maldonado. Capt. Fitzroy [P.]. 

 v. d ad. sk. Paysandii, Uruguay (Gibson). Sclater Coll. 



o. Jr. sk. Lugan Bridge, Buenos Ayres. II. Durnford [C.]. 



12. CYBERNETES. „_ 



Type. 



Gubernetes, Such, Zool. Joum. ii. p. 114 (1825) C. yetapa. 



Cybernetes, Cab. et Hein. Mus. Hein. ii. p. 42 (1859) C. yetapa. 



This monotypic form, although obviously allied to the preceding, 

 is at once recognizable by its peculiar elongated and much graduated 

 tail, of much stiffened feathers. It inhabits the pampas-districts of 

 S.E. Brazil and the adjoining countries, extending into the north of 

 the Argentine Republic. 



1. Cybernetes yetapa. 

 Yiperu, Azara, Apunt. i. p. 322. 

 Muscicapa yetapa, Weill. Nouv. Diet. xxi. p. 460 (1818) : id. Enc. 



Meth. p. 834. ' 



Tyranmis bellulus, Vieill. Nouv. Diet. xxxv. p. 75 (1819) ; id. Enc. 



Meth. p. 846 ; Puch. Arch. Mus. Par. vii. p. 360. 

 Muscicapa yiperu, Licht. Doubl. p. 52. 

 Muscicapa longicauda, Spix,Av. Bras. ii. p. 14, pi. 17. 

 Gubernetes cunningharoii, Such, Zool. Joum. ii. p. 1 14, pi. 4. 



