﻿tion being the thalassine-blue colour on the head, and the black streak through the eye, 

 which in the latter species only just encircles that organ while ini^. cyanoleuca it is 

 produced over the ear-covert. Even in very young examples of the present bird, the 

 blue on the head is very apparent. I have satisfied myself as to the birds from the 

 above-mentioned localities, really belonging to H. cyanoleuca, by an actual examination 

 of all of them except the bird from Angola. No doubt, however, this bird is rightly 

 identified, as the Benguela specimen is certainly referable to the present species. 



In a recently received collection of the late indefatigable naturalist Mr. C. J. Andersson, 

 I was delighted to find a series of H. cyanoleuca from Ondonga in the Ovampo Country, 

 situated to the north of Damara Land, and amongst these was one young bird which had 

 the beak very short, and of an orange colour variegated with black. The bird from the 

 Monocusi River, forwarded by Mr. Ayres, is now in the collection of the Rev. H. B. 

 Tristram, and is the most beautiful specimen I have yet seen. I have taken advantage 

 of his kindness in lending it to me to figure it in the accompanying plate. 



My friend Mr. J. J. Monteiro has given me the following note on this species as 

 observed by him in Benguela, where it is by no means rare. 



" These birds are very abundant all over Angola and the country that I have explored 

 (Xoango to Little Fish Bay), wherever trees are found, whether in the vicinity of water 

 or not- They are always to be seen on the tops of trees, preferring a dead or bare branch, 

 where, during the hottest part of the day, they constantly repeat a loud plaintive, whistling 

 song ; the loud monotonus droning of the cicada; being the only other sound to break the 

 silence of noon, under the fierce glare of the tropical sun." 



Mr. Layard has lately sent me two specimens of H. cyanoleuca from the Cape Colony. 

 One of these was from Mosilikatze's country, while the other was forwarded to him from 

 the Knysna by his zealous correspondent Mr. Atmore. 



The description, measurements and the lower figure in the plate are taken from the 

 specimen from the Monocusi River, kindly lent me by Mr. Tristram. The upper figure 

 is taken from a young bird in my collection from the Zambesi River. 



