, 
MOUSE-COLOURED TYRANT 147 
very minute red spots, irregularly distributed. Mr. 
Dalgleish says, ‘‘ Some eggs have only two or three 
spots, none have more than eight or ten.”’ 
Mr. Barrows says, ‘‘ The adults have several of 
the primaries remarkably attenuated. Young birds 
appear to acquire these attenuate primaries only 
after a complete moult. But I took one specimen 
which showed one or more primaries with tips of 
ordinary shape but with a line apparently worn into 
the vane of the inner web, so as to mark out distinctly 
the attenuate tip, and it seemed as if a little more 
wearing would cut out a piece which would leave 
the primary as in the old bird.” 
MOUSE-COLOURED TYRANT 
Tenioptera murina 
Above sandy cinereous, whitish round the eyes; wings and tail 
blackish with whitish edgings; below much paler, throat whitish 
with slight black striations ; belly and crissum tinged with ochraceous ; 
under wing-coverts and flanks pale ochraceous ; bill horn-colour ; feet 
black; two outer primaries acuminated; length 7 inches. Female 
similar, but outer primaries normal. 
Tus species inhabits the Mendoza district, and 
migrates south in spring. I met with it on the Rio 
Negro, in Patagonia, where it made its appearance 
in October. The sexes are alike. The entire upper 
plumage is dull grey with a pale rufous tinge; throat, 
breast, and belly pale buff tinged with grey. It is 
a solitary bird, restless in manner, has a swift flight, 
