LITERATURE. — Thonnérieux et al. (1989); Weesie (1996); Balanca & de Visscher (1997); Borrow & Demey (2001, 2014); Portier (2002c); Balanca et al. (2007); Sinclair & Ryan (2010); Dowsett et al. (2013).
FIELD DATA. — GBIF.
STATUS. — Palaearctic migrant.