234 LLOYD’S NATURAL HISTORY. 
THE GUANS. GENUS ORTALIS. 
Ortatis, Merrem, Av. Icones et Descr. ii. p. 40 (1786) ; Whar- 
ton, Ibis, 1879, p. 450. 
Type, O. motmot (Linn.). 
Sexes similar in plumage. ‘Top of the head feathered. 
The width of the upper mandible is greater than the height. 
A large naked space round the eye; a band of thin feathers 
down the middle of the throat ; no wattle. 
Tail composed of ¢zwe/ve feathers, long and rounded, the 
outer feathers being shorter than the middle pair. 
First primary flight-feather such shorter than the tenth ; the 
sixth slightly the longest. 
Tarsus about equal in length to the middle toe and claw. 
To facilitate identification the species may be divided as 
follows :— 
A. Outer primary flight-feathers brown or bronze-brown. 
a. Extremities of the outer tail-coverts chestnut. 
a’, Chest uniform in colour. 
a’, Outer tail-feathers chestnut almost to the 
base (Species 1 and 2, pp. 235, 236). 
6°, Outer tail-feathers with the basal half or more 
dark, and the remainder chestnut (species 
2\to 6, pp. 236-238). 
61. Chest feathers margined or spotted with whitish 
atthe extremity.” 
c’. Third pair of tail-feathers never widely tipped 
with chestnut on both webs; no strongly 
marked eyebrow-stripe extending back. 
wards down the sides of the head (species 
7 to 10, pp. 239-241). 
ad’, Third pair of tail-feathers widely tipped 
with chestnut on both webs; white eye- 
brow-stripes strongly marked and continued 
* In O. superciliaris the spots on the feathers of the chest are rather 
faint and indistinct. 
