56 
On the Avifauna of Bucaramanga. 
margin of the wing-feathers are also a nniform yellowish 
white. The flanks are greyish olivaceous, variegated with 
whitish, and on the inner flanks under the wing there is a 
bundle of silky-white feathers of a fluffy appearance. The 
under tail-coverts are yellowish white, marked with indistinct 
dusky spots on each side of the feather. 
The wings are a blackish brown, with very indistinct mar¬ 
gins of greyish olive to the secondaries and the middle portion 
of the outer webs of the primaries. The smallest wing- 
coverts are dark brown, margined with the colour of the 
hack, the medium-sized and the longest coverts more blackish 
brown, tipped broadly and distinctly with white spots (these 
forming two conspicuous and well-marked white wing-bands). 
The least tertiaries also show inconspicuous narrow white 
margins to their tips behind. 
The tail-feathers are of the same cinereous colour as the 
back, with blackish shafts. The three outer rectrices on each 
side show sharp and conspicuous white margins to the inner 
webs from nearly the base to the tip. Upper mandible 
blackish brown; the under mandible whitish, obscured with 
brownish on the side of the base and on the tip. Legs 
blackish plumbeous, claws clear yellowish white. 
The young bird differs from the old one in having all the fea¬ 
thers of the breast down nearly to the belly and of the jugulum 
margined with greyish black; these margins are more con¬ 
spicuous on the sides of the feather than on the tip, but give 
to these parts of the body a somewhat scaly appearance. The 
white superciliary stripe is not nearly so broad as in the old 
bird, and much obscured by blackish margins to the feathers. 
The feathers on the forehead show somewhat lighter centres, 
but there are no linear shaft-stripes ; these feathers are also 
not nearly so stiff and pointed as in the adult. 
On the neck and upper part of the back the white striations 
are much more conspicuous, being broader and more generally 
dispersed. The white wing-bands are not so conspicuous, 
being narrower and more soiled with rusty yellowish. The 
conspicuous white margins to the inner webs of the tail- 
feathers are altogether wanting. 
