122 Baron R. K. von Warthausen on the Nidification 



as theii" green plumage cannot be distinguished from the foliage. 

 I have often stood beneath a tree full of them, without being 

 able to see one. They roost in flocks. They have favourite 

 roosting-places among lofty trees, where they assemble just 

 before dark, and may be seen making for these common centres 

 in great numbers, chattering and screaming as they fly. 

 [To be continued.] 



XIII. — On the Nidification of certain Birds in North-eastern 

 Africa. By Baron Richard Konig von Warthausen. 



(Plate V.) 

 In the following paper, the friends of Oology will receive de- 

 scriptions of the eggs of certain birds of North-eastern Africa. 

 They are nearly all as yet undescribed, and may prove to be of 

 greater interest from the fact that most of them belong to 

 species common to the European Fauna. Some of them came 

 into my possession through the special kindness of Dr. Theodor 

 von Heuglin, Austrian Consul at Chartum in the Sudan, who, 

 also, has drawn the figures to illustrate the paper * ; whilst the 

 other specimens were collected by Herr Emile Wilke for me, and 

 under the direction of Dr. Theodor von Heuglin. 



I have used the old French duodecimal measurement in my 

 descriptions. 



1. Falco tanypterus, Licht. \_F. cervicalis, A. Brehm et 

 Heuglin (non Licht.) : F. biarmicus, Brehm in Naumannia (non 

 Temm.).] 



This bird breeds in Egypt, on the Pyramids of Gizeh (Djiseh) 

 and Dachschur, and on the Moxatam Mountains. Several nests, 

 taken between the 14th and 26th of March 1858, contained 

 from three to four fresh eggs. They are deposited, sometimes 

 in a cleft on the naked stone, surrounded by a little sand only 

 or by some small branches ; sometimes in a deserted and restored 

 nest of Milvus parasiticus, which bird breeds in the same locali- 



* We much regret being unable to publish more than one of the nicely 

 executed plates which were intended to illustrate Baron R. Konig von 

 Warthausen's valuable paper. — Ed. 



