"Vol. xxxiii.] 80 



feathers and conspicuous dark shaft-lines; interscapular 

 region also dusky brown, with whitish bases to the feathers ; 

 shorter scapulars uniform brown ; longer scapulars blackish- 

 brown tipped with white ; wing-coverts dark grey, margined 

 with brown and longitudinally tipped with white ; back for 

 the most part fawn-brown ; sides of the body and hinder 

 aspect of the thighs ash-grey, some of the feathers on the 

 sides of the body tipped with white ; under-surface of the 

 body dull white. Entire scutes on the distal portion of the 

 tarsi eight to ten in number. Culmen 62 mm. ; tarsus 320; 

 middle toe and claw 144. 



"Hub. Bolivia. 



" Type in the Tring Museum : £ ad. Esperanza, Bolivia, 

 4000 metres, 9. x. 96. Gustav Garlepp coll. 



"The following keys may help to identify the genera and 

 species : — 



Key to the Genera. 



A. Tarsus naked, the front portion scutellated 



along its entire length ; nestling covered 



with stiffened hair-like feathers Rhea. 



B. Tarsus feathered on the proximal portion 



and scutellated on the distal portion only ; 



nestling covered with soft down PTEROCNEivriA. 



" Genus Rhea Briss. 

 Key to the Species. 



A. Upper surface sooty-brown ; under surface 



ash-grey. Cuhnen 102 mm. ; middle toe 



and claw 115 americana. 



B. Upper surface lead-grey; under surface 



pearl-white. Culmen 97 mm. ; middle toe 



and claw 152 americana rothscJiildi. 



" Genus Pterocnemia Gray. 

 Key to the Species. 



A. Upper surface grey, everywhere blotched 

 with white ; scutes on lower portion of 

 the tarsus sixteen to eighteen in number. . pennata. 



