216 
BLUE-HEADED GROUND PIGEON. 
Geophilus ? cyanocephalus. 
PLATE XXVII. 
Columba cyanocephala, 2. p. 608. sp. 54 Wagler, Syst. 
Av. sp. 112. — Tartar Jamaicensis, Briss. Orn. I. p. 135. 
t. 13. f. 1 Colombe-Galline i cravate noire, Temm. Pig 
Pam. Trots, pi. 3 Id. 8vo. ed. 390. — Blae-headed Tar- 
tle, Lath. Syn. 4. p. 651. 45 Id. Sup. p. 100. 
In this interesting bird we find a modification in 
the form of the bill, not exhibited by any of the spe- 
cies already described. It is nearly straight, the up- 
per mandible having scarcely any deflection at tiie 
tip, and the under one being without any apparent 
angle, and so similar in appearance to that of a cer- 
tain species of Turnix, that Temminck observes, the 
bill of the one might be substituted for that of the 
other, without detection. It has also the whole of 
the base of the upper mandible covered with feathers, 
an approximation to which we have seen in the Cop- 
per-coloured Ground-Dove, in which bird the culmen 
or upper part of that mandible is thinly clothed with 
small feathers. The tarsi, which are pretty long, 
are covered with small hexagonal scales, as in the 
two species afterwards to be described ; and the 
