PASSEEINE BIRDS. 



421 



and the Nocturnal Fissirostres, the plumage of which 

 is soft and hght, like that of the Owls, and their 

 beak opens to a point beyond the eyes. 



Fig. 34 7.— head of >-YCTiBn:s. 



The Diurnal Fissirostres constitute the family of 



The Swallows {Hirundo), all oi which are remarkable for the 



Ftg. 348.— swallow. 



