Leucopolius Bonap., Comp. Rend., xliii, p. 417 (1850).
Type by taut., Aegialitis marginata Vieill.
This genus has hitherto been generally united with Charadrius (Aegialitis auct.), of which hiaticola is the type. It differs, however, from the birds of that group, according to Lowe, in having the lacrymals free and presenting outward projecting processes like the Gulls; there is no foramen for the nasal duct, its place being taken by a groove.
In Leucopolius most of the characters, except the important ones mentioned above, are also those of Charadrius. The bill is small and practically straight; the tarsus fairly long and reticu¬lated throughout; there is no hind toe.
Key to Species.
A. White band on hind-neck not divided from back by black band………….Z. alexandrinus, p. 160.
B. White band on hind-neck separated from back by a black, band………………L. peronii, p. 164.