SWALLOWS. 



321 



FIG. 346. HEAD OF TYRANNCS. 



The Fly-catchers (Muscicapa}* the Thrushes, the Nightingale, the Wrens, 

 the Wagtails, the Titlarks, and many others of similar habits belong to this 

 family. 



TRIBE II. FISSIROSTRES.f 



The Fissiros- 

 trcs are distin- 

 guished by their 

 beak, which is 

 short, wide, hori- 

 zontal, flattened, 

 slightly hooked, 

 without any 

 notch, and very 

 deeply cleft ; the 

 opening of the 

 mouth is thus 

 very wide, and 

 they easily cap- 

 ture the insects 

 they pursue on 

 the wing. These 

 birds are exclu- 

 sively insectivorous : they are also migratory, and are found in 

 all parts of the world. This tribe is divided into two sections 





FIG. 347.- HEAD OF NYCTIBIUS. 



* Musca, a fly ; capio, to take or catch. 

 t Fis&us, cloven ; rostrum, a beak : cleft-be 



rostrum, a beak : cleft-beaks. 



21 



