6i8 



PATAGONIAN EXPEDITIONS: ZOOLOGY. 



Neck : Throat and back of neck slaty, or grey ; the lower under neck 

 white. 



Back : Interscapular region and lower back clear slate, or slaty grey ; 

 the rump and upper tail-coverts pure white ; some of the feathers of the 

 beginning of the white on the rump tinged with rusty. 



Fig. 308. 



Tachytriorchis alhicandatus. Adult male, cited. Natural size. 



Tail : White, with a broad sub-terminal band of black, and a terminal 

 narrow bar of pure white ; the part of the tail anterior to the sub-terminal 

 band of black has the white crossed by numerous narrow stripes, or lines 

 of slaty grey, or pale slate color. 



Wings : Darker than the back of the same tone and with the anterior 

 lesser coverts rusty, as are often some of the smaller scapulars ; less fre- 

 quently this rusty shade is apparent on the longer scapulars ; under wing- 

 coverts white ; axillaries white, barred with slaty or grey. 



Lower parts : Except the throat, white ; immaculate generally save on 

 the flanks, thighs and under tail-coverts, which usually are faintly barred 

 and marked with rusty, ash-grey, or dusky. Field notes on the colors of 

 the bill, cere, feet and legs, as well as that of the irides, are not available. 



Adult female. — Similar to the adult male, but with a greater amount of 

 rusty on the shoulder and the general color usually darker and richer; 

 larger than the adult male; length 23.00; wing 17.80; tail 10.25. 



Immatuye birds and young of tJie year. — Male; young of the year. — 

 General color of the plumage deep dusky brown ; the head darker, the 

 lores white or whitish, and an indistinct white eyebrow ; the feathers of the 



