MUSCIVOKA. 237 



I 

 506. Muscivora tyrannus. 



Fork-tailed Flycatcher. 



Ilnscicapa fyranmis Linn. Syst. Nat. i. p. 325, 1766 (Cayenne). 

 Mili'idus ti/rannus Cab. in Schomb. Reis. Gruian. iii. p. 699, 1848 ; 



Salvin, Jbis, 1885, p. 299 (Roraima 3500 ft., Bartica Grove) ; 



Selater, Cat. B. Brit. Mus. xiv. p. 277, 1888 (Camacusa). 

 Muscivora tyrannus Brabourne & Chubb, B. S. Amer. i. p. 304, 



no. 3107, 1912. 



Adult male. Entire head and sides of face black with a large 

 concealed patch of lemon-jellow on the crown of the head ; back, 

 scapulars, and lesser upper wing-coverts ash-grey, somewhat 

 darker on the last ; bastard-wing dark brown ; median and 

 greater upper wing-coverts, primary-coverts, and flight-quills 

 dark brown with pale edges to some of the feathers, inner webs 

 of flight-quills whitish on the basal portion ; upper tail-coverts 

 and tail black, the outer pair of tail-feathers, which are elongated 

 and much extended beyond the others, white, for a considerable 

 distance, along the basal portion of the outer web ; cheeks, throat, 

 and entire under surface of body pure white, including the 

 axillaries and under wing-coverts ; under surface of flight-quills 

 brown with white inner edges; lower aspect of tail blackish 

 brown, the long outermost pair of feathers edged with white on 

 the outer webs of the basal portion. 



Total length, to tips of middle tail-feathers 181 mm., to tips of 

 long outermost feathers 374, exposed culmen 18, wing 117, tail — 

 .middle feathers 70, penultimate pair 110, outer pair 258, tarsus 18. 



The male described was collected on the Abary River in 

 November 1906. 



Adult female. Similar to the adult male in the colour of the 

 plumage, but differs in the smaller measurements. 



Total length, to tips of middle tail-feathers 171 mm., to tips of 

 long outermost feathers 2'J8, exposed culmen 15, wing 107, tail — 

 middle feathers ()Q, penultinuite pair 105, outer pair 199, tarsus 17. 



The young bird differs from the adult in the absence of the 

 yellow coronal patch, in having the wings very pale brown, and 

 the short tail-feathers. 



Breeding-season. Unknown in British Guiana. 



Sest. Unrecordecl in British (Tiiiaiia. 



E[igs. Uiidescribed from British (Juiana. 



