LITERATURE. — Dowsett (1993); Weesie (1996); Mauvais (1998); Borrow & Demey (2001, 2014); Sinclair & Ryan (2010); van den Bergh (2013); Dowsett et al. (2013); Lindstrom et al. (2015); ABC (2020).
STATUS. — Palaearctic migrant.