250 PATAGONIAN EXPEDITIONS: ZOOLOGY. 



dull deep brown, each feather margined with sandy buff. Sides of head 

 and face slate, the ear coverts tinged with sandy. 



Neck : Chiefly like crown above, but interrupted 

 FiG.j43. by a slaty collar, just behind the occiput. Sides 



of neck slaty, paler than on the face and fore- 

 head. Throat white, separated from the slaty of 

 the face and neck by a black line one-fourth of an 

 inch in width, which starts at the base of the 

 fm lower mandible. These lines on either side of 



~, . the white throat widen and join into a broad me- 



Inmocorys rumictvorus. . . J 



Natural size. P. u. O. C. sia * band, which, passing down the neck, widens 

 7781. Adult male. in its turn so as to form a black dividing line be- 



tween the white of the breast and the slaty gray 

 of the sides of the neck. 



Back : Dull deep umber, each feather margined with sandy rufous, and 

 decorated with rufous markings. This is particularly noticeable on the 

 greater coverts of the wing. Rump like the back, and upper tail coverts 

 similar in color and marking. 



Tail : Rectrices brownish black, tipped and margined with sandy 

 white, which becomes pure white on the two outer feathers, where the 

 white areas preponderate. 



Wing: Upper coverts like the back. Bastard wing, primary coverts 

 and quills grayish black, with white or isabelline etching and tips, most 

 conspicuous on the primary coverts and secondary quills. 



Lower parts : Neck and chest as described. The sides of the breast 

 shaded with sandy rufous feathers, which have obscure brown markings. 

 Rest of under parts white, except some of the under tail coverts, which are 

 isabelline, with some brown markings. Axillaries blackish. Under wing 

 coverts blackish, with white fringing. 



Bill and feet much as in T. orbignianus. The female differs from the 

 male in having the foreneck brown, no collar interrupting the brown of the 

 upper neck. The white throat is separated from the brown of the fore- 

 neck by a line of black, which extends upward to the fore part of the 

 cheeks, and down in disconnected spots to the chest, forming an obscure 

 line across that region. This black marking is much as in the male, but 

 obscure and indefinite and not nearly as pronounced. 



Immature males (P. U. O. C., Nos. 7780 and 7916) resemble adult 



