ANATIDsE. 343 



from a flock which had settled on a vley a day's journey 

 from Barmen. It is, however, very common in the 

 Ondonga country during the wet season ; and whilst I 

 was there eggs were brought to me which were said to 

 belong to this Duck ; and, though I did not succeed in 

 identifying them with certainty, I think it probable that 

 such was the fact, as they exceeded in size the eggs of 

 Anas erythrorhyncha, from which they also differed in 

 form and colour. 



The iris is cherry-coloured; the bill lead-coloured, 

 except the nail, which is black, as are also the legs, toes, 

 and webs. 



Measurements of a male and a female : 



396. ThalaSSOrnis leuCOELOta, Smith. Yellow-throated Diving 

 Duck. 



Thalassornis leuconota, Smith's Zool. of S. Africa, pi. 107. 



Layard's Cat. No. 660. 



Clangula leuconota, Chapman's Travels in S. Afr., App. p. 423. 



This is a comparatively scarce species in both Great 

 Namaqua and Damara Land ; but during one season I 

 found it tolerably abundant at the large marshy vley of 

 Omanbonde in the latter country. 



It is generally found singly or in pairs. When dis- 

 turbed it takes wing unwillingly and merely skims the 



