TiCHoimojrA. 443 



Butterfly-birds in many languages and in countries as far apart 

 as Switzerland and Eastern Tibet, Their trivial name of ^\^all- 

 Oi'eeper is given them on account of their resorting to the walls 

 of buildings and retaining walls of roads etc, ^hen they leave 

 their wilder, uninhabited summer forests and visit tlie lower liills 

 and plains of Europe. It is a not uncommon cage-bird in 

 Switzerland and will lay freely in captivity, though no instances 

 are recorded ot their rearing any young under these conditions. 



