124 TYRANNISE. 



pair of tail-feathers is interesting. In the male these two feathers 

 reach a length of nearly ten inches, the rest of the tail being about 

 three inches in length. The vane on the inner side of each is wanting 

 for the first two inches, and then suddenly develops to a width of 

 nearly two inches, which it maintains almost to the tip, when it 

 gradually narrows. The vane on the outer side of the shaft is only 

 about one-quarter of an inch wide, and is folded so tightly against the 

 shaft that it is quite inconspicuous. In the only two males of this 

 species which I have seen flying, these long feathers seemed to be 

 carried folded together beneath the rest of the tail, and stretching out 

 behind like a rudder or steering-oar, their vanes at right angles to the 

 plane of the rest of the tail." 



Mr. Gibson gives a different account, and says the flight is singularly 

 feeble, resembling the fluttering passage of a butterfly through the air, 

 while the tail streams out behind. 



It inhabits Paraguay, Uruguay, and the eastern portion of the 

 Argentine Republic, ranging as far south as the pampas in the neigh- 

 bourhood of Patagonia. It is usually seen singly or in pairs ; Azara 

 says he saw a flock of thirty individuals, but as they were all females, 

 it may be that in this species, as in Lichenops perspicillata, the females 

 are sometimes gregarious, and the males always solitary. It frequents 

 open places, such as the borders of marshes, or plains covered with tall 

 grasses, and perches in a conspicuous place, from which it darts at 

 passing insects like a Flycatcher. 



Mr. Gibson found its nest on the ground amongst herbage, and 

 describes it as a neat structure of dried grass, containing three white 

 eggs with a faint cream-coloured tinge. 



124. CYBERNETES YETAPA (Vieill.). 

 (YETAPA TYRANT.) 



Cybernetes yetapa, Sd. et Salv. Nomencl. p. 43; White, P. Z. S. 1882, p. 604 

 (Itapua, Misiones). 



Description. Above hoary grey, with lineiform blackish shaft-stripes ; wings 

 black, with a large chestnut-brown patch occupying the outer webs of the inner 

 primaries ; tail of twelve much graduated feathers, black ; outer web of external 

 rectrices white ; beneath same as above, but rather paler ; throat and crissum 

 white ; patch on each side of the neck, and collar across the neck dark chestnut- 

 brown ; under wing-coverts and inner webs of wing-feathers white ; bill pale 

 brown ; feet black : whole length 16-0 inches, wing 5*0 ; tail, extreme rectrix 

 12-5, middle 26. Female similar, but less bright. 



Jlab. S.E. Brazil, Paraguay, Bolivia, and Northern Argentina. 



