264 
AFRICAN BRISTLE-BILL. 
Total length about 9| ; bill from tbe front, ; 
wings, ; tail from the base, 4 ; tarsus, 1 ; hind- 
toe and claw, ; middle ditto, 
OLIVE BRISTLE-NECK. 
Tricophorus olivaceous , Swains. 
Olive-green : chin and part of the throat palo yellow. 
The three birds we are about to describe, although 
not attractive in their plumage, are yet remarkable 
for the very singular peculiarity which gives rise 
to their name of Bristle-Necks, or Bristle-necked 
Thrushes. The nuchal bristles, in nearly all those 
birds which possess them, are so short and slender 
as to escape detection, unless the adjoining feathers 
are carefully raised and examined ; but, in the sub- 
genus before us, these bristles are so much developed, 
and are so long, that they often extend more than 
an inch beyond the feathers of the neck. It is not 
known for what especial purpose these bristles are 
intended. We doubt, however, the accuracy of the 
assertion, that they are found in both sexes ; since 
we believe they are connected with the process of 
copulation, and that they are only possessed, at least 
in their greatest developement, by the females. 
The genus Trickopkorus was proposed by M. 
