1892.] CLASSIFICATION OF BIRDS. 247 



3. GlareolidcB. 



Afro-Indo- Australian. 



Schizorhinal (except Pluvianus). Nobasiptery- 



goid processes.. 

 {G/areola, Pluvianus, Cursorius, Dromas.) 



4. ThinocoridcB (incl. Attagis). 



Neotropical. 



Scliizo- inclining to holorhinal. 



No basipter)'goid processes. 



With a globular crop. {Unique among Cliara- 



driiformes.) 

 Phytophagous. 



5. QHdicnetnidce. 



Cosmopolitan. 



Holorhinal. No basipterygoid processes. 



16 cervical vertebrae. 



No hallux. 



6. Parrida. 



Tropical. 



Schizorhinal. With basipterygoid processes. 



Hallux long. 



16 cervical vertebrae. 



II. Gavi^. 



Dovi'ns of young more complex, approacbing typical 



downs. 

 Front toes webbed. Aquatic. Zoophagous. 

 Supraorbital glands always large. Schizorhinal. 

 Hypotarsus with two grooves. 



1. Alcidce. 



Sternum with two notches. Coracoids separate. 

 No ectepicondylar process. Procoracoid process 



small. 

 Periarctic. 



2. Laridee. 



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. Aquinto-cubital. 



