258 



GLAEEOLA. 



Nearest 

 allies. 



The Common Pratincole is most nearly allied to Nordmann's Pratincole, and Severtzow 

 says (Journ. Orn. 1875, p. 183) that intermediate forms between them occm- in Turkestan, 

 but I have never seen anything of the kind. The general direction of migration of the 

 Common Pratincole leads to the supposition that its ancestors were isolated during the 

 Post-Pliocene Glacial Epoch in North Africa. 



GLAREOLA ORIENTALIS. 



ORIENTAL PBATINCOLR 



Diagnosis. Glareola axillaribus castaneis : rectricum pogoniorum externorum basalibus partibtis totis albis ; 

 Cauda non valde furcatS. (adultorum etiam minus quam 30 millim.). 



Variations. It is not known that this species is subject to any local variation. 



