THE GUANS. 249 
Adult Female——Top of the head and nape dull chestnut, rest 
of the upper-parts greyish-olive ; chest olive-grey, shading into 
white on the rest of the under-parts ; the five outer pairs of 
tailfeathers tipped with white or pale buff, Total length, 
22 inches; wing, 8°8; tail, 96; tarsus 2°8; middle toe 
and claw, 2°7. 
The plumage in the male and female is probably similar, 
but no male example, in which the sex has been ascertained, 
has been examined. 
Range.—Northern South America; the coast region of the 
United States of Colombia, and near Caracas, Venezuela. 
XVI. THE GREY-HEADED CHESTNUT-WINGED GUAN,. 
ORTALIS CINEREICEPS. 
Ortalida poliocephala, Auct. (nec Wagler). 
Ortalida cinereiceps, G. R. Gray, List Gallinge Brit. Mus. pri 
(1867): 
Ortalida frantzit, Cabanis, J. f. O. 1360, [. 211. 
Ortalis cineretceps, Richmond, P. U. S. Nat. Mus. xvi. D523 
(1893); Ogilvie-Grant, Cat. B. Brit. Mus. xxii. Dp. 545 
(1893). 
Adult Male and Female.—Similar to O. garrula, but the head 
and nape are dark grey. Total length, 22 inches; wing, 8°5; 
tail, 8-7; tarsus, 2°8; middle toe and claw, 2°6. 
Range.—Central America; Costa Rica, Veragua, Panama, 
to the United States of Colombia. 
Habits.—Dr. Von Frantzius writes that this bird is “univer- 
sally called ‘Chachalaca,’ and is spread over the whole of the 
high plateau, particularly in open places near the forest.” 
XVII, THE ECUADOR CHESTNUT-WINGED GUAN. 
ORTALIS ERYTHROPTERA. 
Ortalida erythropiera, Natterer MS.; Licht. Nomencl. Pp: o7 
(1854) [descr. nulla]; Sclater and Salvin, P. Z. S. 1870, 
Pp. 540. 
