71 
Birds of Southern Kamerun. 
down like thistle-down, which in places was thrust through 
the leaves to form attachments. Another sort of wool, of 
tough yellowish-brown adhesive fibres, was used to form 
the stitches that held the edges of the leaves together, and 
also woven over the outside of the entire nest to hold the 
slippery thistle-like down in place. 
2103. Hylia prasina. 
Sharpe, Ibis, 1908, p. 325. 
A very common little bird of the tree-tops in the opener 
country and the borders of the forest—never found in the 
depths of the forest. It flits among the twigs hunting for 
its insect food, which is often found to consist of the 
Cocci that adhere to the bark of the twigs. It never 
perches fully in sight, like the similar little Camaroptera. 
A bird-call I had often heard coming from the thickest 
tree-tops or tangles of vines, which I called the “ saw-filing 
note,’^ because of its piercing shrillness, and because it was 
double, like the drawing of a file across a saw and back 
again, though it was not so grating and harsh a sound as the 
comparison would suggest, was at last traced to this little 
bird. 
2105. Stiphrornis gabonensis. 
Sharpe, Ibis, 1908, p. 325. 
2106. Stiphrornis xanthogaster. 
Sharpe, Ibis, 1908, p. 325. 
Though Reichenow's arrangement is followed here as 
elsewhere, it seems strange to associate these two species 
(S. gabonensis found in the coast-region and S. xanthogaster 
at the Ja) with such birds as Camaroptera and Sylviella. 
These latter and other similar Warblers are birds of the 
bushes and brush of open land, not particularly secretive, 
but escaping hostile observation by their plain colours, 
small size, and lively movements. The species of Stiphrornis 
inhabit the dark forest and seek their food on the ground, 
while they light up the gloom with their bright colours. 
