Order I. PASSEllES. 



Tliis edition of the Fauna follows its predecessor in beginning 

 ■with the Passeres. The classiHcatioii and further division of this 

 Group presents more difficulties than all the rest put together. 



Briefly, the Passeres may be defined as follows : — Skull 

 aegithognathous (vomer truncated in front). Sternum with a 

 large spina externa, and no spina interna. Clavicle with expanded 

 free ends. Hypotarsus complex. 



Wing lacking the biceps and expansor secondariorum muscles. 

 Thigh muscles having no accessory femorocaudal or abiens 

 muscles present. 



Only one cai'otid — the left — is present. Caeca are vestigial. 

 Oil-gland nude. Wing eutaxic. 



The arrangement of the Sub-Orders adopted here is that of 

 Gadow (Bronn's Thier-reichs, Bd. vi., ii. Syst. Theil, 1893). 

 But the subdivision of the Anisomyodi is based on tliiit of 

 Pycraft (P. Z. S. 1905-(J-7), his Olirjomyodi answering in part to 

 that of Pluxley (P. Z. S. 1867). 



StB-ORDER. 



Group. 



r 



! Clamatores 



Family. 



Enryla!nii<la?. 

 Coting-ida?. 

 PhilepittidiB. 

 Pipridai. 



Sub-Family. 



Anis^omyodi 



Olijfomyodi 



Tracheophona^. 



TjTaniiida.*. 

 Pittitlfe. 

 Phytotomidje. 

 Oxyrhampida;. 



Formicariidie. 

 D endrocolaptida? . 

 Furnariidaj 



Conopoi) 



Xenicidii 



Furnariinte. 



Sclerurina?. 



Synallaxina'. 



Margarornithin;B. 



Phylidorhina?. 



C onopophagiiiiV . 



Pteroptocliinte. 



HvlactinfB. 



-r^. T r Menurid;v?. 



JJiacromyodi •{ r\ ■ 



Having regard to the fact that the main divisions of the 

 Passeres are based on the structure of the svriiix, a brief sutnmarv 



