350 Mr. T. Ayres on the Unidhobyy of Transvaal. 



pair of birds, which show the ditt'ereiice iu size between the 

 sexes in this species : — 



Bill from forehead 

 along the course 



of the culiiien. Wing, 



in. in. 



Male 0-4 11-3 



Female 4-3 10-6 



Platalea tenuirostris, Teraui. Slender-billed Spoonbill. 



Female, shot on the Mooi river near Potchefstroom, 21)th 

 October, 1882. 



This species, thongh seldom obtained, can hardly be called 

 a scarce visitor to these parts during our winter months. 



Casarca cana (Gmel.). South-African Shell-Duck. 

 This is always a very scarce species with us ; it is more 

 like a Goose than a Duck in its habits and appearance. 



PoDiCEPs CRisTATUs (Liuu.). Great Crested Grebe. 



Male in full breeding-dress, shot 2nd September, 1883. 



This Grebe is exceedingly scarce with us ; the specimen 

 sent was obtained by my brother on the river near Potchef- 

 stroom. 



[I annex the measurements of this specimen, together 

 with those of four other South-African examples : two of 

 the latter have already been recorded in ' The Ibis,' 18()9, 

 p. 303, but I repeat them here for the sake of comparison ; the 

 other two have been kindly lent to me by Canon Tristram. 



Bill from 

 Wing. Tarsus. forehead, 



in. in. in. 



