XXIV] CLASSIFICATION 635 



Tribe 10. Charadriiformes (Plovers, Gulls and Pigeons). 

 Schizognathous, legs short. 



Ex. Charadrius, Plover ; Larus, Gull ; Pterocles, Sand- 

 grouse ; Columba, Pigeon. 



Tribe 11. Cuculiformes (Cuckoos and Parrots). Desmo- 

 gnathous, fourth toe either permanently reversed or reversible 

 at will. 



Ex. Cuculus, Cuckoo; Psittacus, Parrot. 



Tribe 12. Coraciiformes. Nidicolous, but nest in holes, 

 arboreal, legs feeble. 



Ex. Coracias, Roller ; Upupa, Hoopoe ; A kedo, King- 

 fisher; Stria, Barn-owl; Caprimulgus, Nightjar; Cypselus, 

 Swift; Picus, Woodpecker. 



Tribe 13. Passeriformes. Nidicolous, construct elaborate 

 nests ; aegithognathous. 



Ex. Passer, Sparrow; Turdus, Thrush; Hirundo, 

 Swallow; Alauda, Lark; Corws, Crow. 



