CUESOKIUS. 



243 



with dry watercourses, and torn up in the valleys with deep torrent-beds, which tell of 

 floods carrying everything before them. But sometimes months and months pass by 

 without a drop of rain, and what vegetation has been spared by the torrents of rain is 

 burnt up by the scorching rays of a burning African sun. 



The typical form of this species is a resident of most of the Karroo districts of the 

 Cape Colony, and in similar country in the Transvaal (Ayres, Ibis, 1871, p. 263) and the 

 Orange Free State (Barratt, Ibis, 1876, p. 212). It is not uncommon in various parts of 

 Great Namaqua and Damara-Land (Andersson, Birds of Damara-Land, p. 261), and a 

 single example is recorded from the valley of the White Nile (Heuglin, Orn. N.O.-Afr. ii. 

 p. 975). 



Young in first plumage are not quite so dark a buff as adults, but are not nearly so 

 pale as adults of the Western form of this species. 



Geographi- 

 cal distribu- 

 tion. 



Plumage of 

 young. 



CURSORIUS BICINCTUS BISIGNATUS. 



HARTLAUB'S COUBSER. 



CuRsoRius BiciNCTOs colore pallidiore. 



Diagnosis. 



Intermediate forms between this and the preceding frequently occur. 



Variations. 



CuTsorius bisignatus, Hartlaub, Proc. Zool. Soc. 1 865, p. 87. 

 Cursorius bicinctus bisignatus {Hartl.), Seebohm, Ibis, 1886, p. 118. 



Synonymy. 



Plates.— Hartlaub, Proc. Zool. Soc. 1866, pi. vi. 

 Habits. — Undescribed. 

 Eggs. — Unknown. 



Literature. 



Hartlaub's Chestnut-winged Courser is only a pale form of Levaillant's Courser, and Subspeoiflc 

 is also said to be slightly smaller. '\^h.Q feathers of the upper parts are margined with nearly 

 white instead of huff, and the ground-colour of the underparts shows the same difference. 

 It inhabits - Benguela and Ovampo-Land. I have a very characteristic example obtained by ^^'Sribu- 

 Andersson at Ondongo ; but two other examples obtained by the same collector in Great tion. 

 Namaqua- Land are intermediate. 



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