216 YELLOW BELLIED, OR 
by one example, the sentinel lark of Le Vaillant, 
or the Macronyx Capensis, Swains. ; the present is 
consequently a new species, readily distinguished at 
the first glance from the former, by its yellow throat 
and broad black gorget. 
The devclopement of the foot, in the Senegal 
species, is in strict accordance with that which is 
found at the Cape ; and we may therefore conclude 
that the habits of both are very similar. The sen- 
tinel lark has been so named by Le Yaillant, from 
its note, loudly and often repeated, perfectly resem- 
bling the challenge, qui vine — qui vive! whenever 
either man or animal passes near it. The Cape 
species, like the present also, has the posterior claws 
somewhat more curved than is usual in this family, 
by which, as Le Yaillant observes, it can perch with 
facility, although it is generally seen upon the 
ground, frequenting the open plains and the borders 
of rivers. 
On comparing this with the M. Capensis, a very 
remarkable difference in the structure of the bill 
may be detected ; it is of the same length in both 
species, but in this the upper mandible is much 
more curved tov T ards its extremity, so as to appear 
almost arched from its base, the tip likewise is 
strongly and distinctly notched, instead of being 
entire ; and the bristles at the base, which in Ca- 
pensis are altogether obsolete, extend in this to half 
the length of the bill, so as to give it, with its 
general form, very much the appearance of that of 
a bush-shrike. The claws are larger, particularly 
