1892.] CLASSIFICATION OF BIRDS. 247 



3. Glareolidce. 



Afro-Indo- Australian. 



Schizorhinal (except Pluvianus). No basiptery- 



goid processes. 

 {G [areola, Pluvianus, Gursorius, Bromas.) 



4. ThinocoridcB (incl. Attagis). 



Neotropical. 



Schizo- inclining to holorhinal. 



No basi pterygoid processes. 



With a globular crop. {Unique among Chara- 



drii formes.) 

 Phytophagous. 



5. (Edicnemidce. 



Cosmopolitan. 



Holorhinal. No basipterygoid processes. 



16 cervical vertebrse. 



No hallux. 



6. Parndce. 



Tropical. 



Schizorhinal. With basipterygoid processes. 



Hallux long. 



16 cervical vertebrae. 



II. Gavi^. 



Downs of young more complex, approaching typical 



downs. 

 Front toes webbed. Aquatic. Zoophagous. 

 Supraorbital glands always large. Schizorhinal. 

 Hypotarsus with two grooves. 



1. AlcidcB. 



Sternum with two notches. Coracoids separate. 

 No ectepicondylar process. Procoracoid process 



small. 

 Periarctic. 



2. Larida. 



Sternum with four notches. Coracoids touching 



each other. With ectepicondylar process. 

 Procoracoid process large- 

 Cosmopolitan. 



17. COLUMBIFORMES. 



Cosmopolitan. Phytophagous. 



Adult downs scarce and restricted to the apteria. 



No lateral cervical apteria. 1 1 remiges. 



Aftershaft rudimentary or absent. 



Oil-gland nude or absent. Aquin to-cubital. 



