THE GUANS. 249 



Adult Female. — Top of the head and nape dull cJiesi)iut ; rest 

 of the upper-parts greyish-olive ; chest olive-grey, shading into 

 white on the rest of the under-parls ; the five outer pairs of 

 tail-feathers tipped tvith ivJiite or pale bupf. Total length, 

 22 inches; wing, 8-8; tail, 96; tarsus 2-8; middle toe 

 and claw, 27. 



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-Vv^INGED GUAN. 

 ORTALIS CINEREICEPS. 



Ortalida polwcep/iala, Auct. {nee Wagler). 



Ortalida ci/iereiceps, G. R. Gray, List Gallinae Brit. Mus. p. 12 



(1867). 



Ortalida franizii, Cabanis, J. f. O. 1869, p. 211. 

 Orialis cinereiceps, Richmond, P. U. S. Nat. Mus. xvi. p. 523 

 (1893); Ogilvie-Grant, Cat. B. Brit. Mus. xxii. p. 515 



(1893). 



Adult Male and Female. — Similar to O. garruia, but the head 

 and nape are dark grey. Total length, 22 inches; wing, 8-5; 

 tail, 87; 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. p. 87 

 (1854) [dcscr. nulla]; Sclater and Salvin, P. Z. S. 1870, 

 p. 540. 



