276 PATyVGONIAN EXPEDITIONS : ZOOLOGY 



Total length, 9.55 inches. 



Wing, 6.5 inches. 



Culmen, 1.25 inches. 



Tail, 2.85 inches. 



Tarsus, 1.95 inches. 



The sexes do not vary in size, but there is an appreciable variation 

 among the seven individuals of the Princeton collection in this respect 

 that does not correlate with sex. 



Co/or. — Adult male (cited above). General color above sandy ash 

 brown, plain on the head and neck, and much variegated on the mantle, 

 wings and back with deep umber, almost black, and cinnamon buff. 

 Below, the prevailing color is buffy, with a black area on the lower breast, 

 grey on the neck, orange cinnamon on the throat, fading to almost 

 white on the chin. 



Head: Crown deep ashy grey with a strong olive tinge, and faint 

 median dusky lines on each feather. Forehead to its base and a broad 

 eyebrow buffy white with a tawny tinge, especially above the ear coverts. 

 This eyebrow is prolonged so as to form an almost complete nuchal 

 band. A black stripe extends from the angle of the bill to the eye, 

 crossing the loral region, and extending for half an inch behind the eye. 

 Forecheeks creamy white shading into ashy grey on the ear coverts. 



Neck: Chin creamy white shading into a well defined jugular orange- 

 cinnamon patch. Lower throat and neck ashy grey, tinged with olive and 

 sandy and shading into creamy buff on the lower breast. Hind neck 

 ashy grey with olive shading. 



Back : Fore mantle ashy grey, becoming streaked with dark centers to 

 each feather on the mantle proper. This shades into the variegated area 

 between the wings where each feather has dark centres with sandy rufous 

 and sandy grey margins. Lower back and rump olive grey. Upper tail 

 coverts sandy buff, with dull olive grey cross bars. 



Tail: Slaty grey, with tawny bases, and tips of pale broad buff. In 

 the slaty grey area of each feather is a dark spot, arrow-shaped on the 

 central rectrices and becoming a band on the outer ones. 



Wings: Greater coverts dark brown margined with sandy buff, and 

 with whitish or creamy white at the ends of the feathers, form a more or 

 less distinct wing bar. The lesser and median coverts like the feathers of 

 the middle back. Bastard wing and primary coverts dull greyish brown. 



