1866.] DR. H. DOHRN ON THE BIRDS OF PRINCE'S ISLAND. 329 



Young males are very much like the females ; but as soon as the 

 bill is full-grown it is much darker than that of the other sex, and 

 from that moment they begin to change in plumage. 



They are very zealous for the multiplication of their race ; I ob- 

 served them building nests and hatching in May and again in June, 

 and I conclude from my specimens that they are also occupied with 

 the propagation of their family in February. Their nest is always 

 attached to the eud of long and thin branches, or leaves of a palm 

 tree. It forms a cone, 15 to 18 inches long and about 9 or 10 inches 

 in diameter at the base ; the small aperture is underneath, and just 

 large enough for the old bird. It is very thick, and constructed of 

 a flat kind of grass in such a manner that not a drop of rain can 

 pass through the roof. The eggs are two in number, light blue. 



16. Foudia erythrops, Hartl. 



Swarms of from thirty to eighty specimens of this widely spread 

 species are common. They usually live together with 



1/. Amadina cucullata, Swains. 



This species hatches from May to July; builds a large nest between 

 the branches of small trees, 6-8 inches in diameter and 5-6 inches 

 deep ; the eggs (four to seven in number) are white, very oblong, of 

 the size of the eggs of Sijlvia trochiloides. 



18. PSITTACTJS ERYTHACUS, L. 



Exceedingly common ; usually flying about in odd uumbers, some- 

 times three or five together. When in town I observed them daily 

 about half an hour before sunset crossing the northern part of the 

 island in a southern direction ; and early before sunrise they used to 

 return to the northern district, I do not know for what purpose, 

 large quantities of food as well as of trees, well fitted for sleeping- 

 places, being in every part of the island. 



19. PSITTACULA PULLARIA, L. 



Said to occur on the island. I never observed it. 



20. Chrysococcyx smaragdineus, Swains. 



These birds live during the dry season (from April to September) 

 in the southern mountainous parts. They vary in size and in the 

 colour of the tail. It seems to me that 0. intermedins, Verr., is not 

 different from this species. 



Their name in San Thome and Principe is " Sobo." 



21. Treron calva, Temm. 



Very common all over the island. Hatches in September. The 

 young bird exhibits no remarkable difference. The iris of this species 

 is light blue. 



22. Columba chloroph^ea, Hartl., n. sp. 



Supra obscure nigricanti-virescens, nitore viridi ; nucha, collo 

 Proc. Zool. Soc — 1866, No. XXII. 



