The Black-Winged Pratincole — Glareola Melanoptera (Nordmann)
This is the Eastern form of the above, nesting from the shores of the Black Sea eastwards to the Altai. Two specimens, which came over in company with the commoner species, were shot in Kent in June 1903.
It may be recognised by the under wing coverts being black and the absence of the white tips to the secondaries.