PASSERINE BIRDS. 



421 



and the Nocturnal Fissirostres, the plumage of which 

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

 beak opens to a point beyond the eyes. 



FlG. 347. HEAD OF NYCTIBICS. 



The Diurnal Fissirostres constitute the family of 

 The Swallows (Himndo\ all 01 which are remarkable for the 



FlG. 348. SWALLOW. 



