2^^ ALLEN'S naturalist's LIBRARY. 



THE GUAXS. GENUS ORTALIS. 

 Orfa/is, Merrem, Av. Icones et Descr. il. p 40 (1786); Whar- 

 ton, Ibis, 1879, p. 450. 



Type, O. viotnwt (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 ej-e ; a hand of thin feathers 

 down the middle of the throat ; no wattle. 



Tail composed of twelve feathers, long and rounded, the 

 outer feathers being shorter than the middle pair. 



First primary flight-feather much 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. 

 rt\ Chest uniform in colour. 



^-. Outer tail-feathers chestnut almost to the 



base (species i and 2, pp. 235, 236). 

 Ir. Outer tail-feathers with the basal half or more 

 dark, and the remainder chestnut (species 

 3 to 6, pp. 236-238). 

 b^. Chest feathers margined or spotted with whitish 

 at the extremity.* 

 r. 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). 

 ^. Third pair of tail-feathers widely tipped 

 with chestnut on both webs ; white eye- 

 brow stripes strongly marked and continued 



* In 0. snperciliaris the spots on the feathers of the chest are rather 

 faint and indistinct. 



