Pelagic

Dsc_7827

Photo by Paul L'Etoile, 20-Dec-2014

Black on primaries P10-P6. No black on P5. From Olsen and Larsson 2004 on Thayer's Gull, "Most show full dark subterminal bar on P5 (but often incomplete and frequently lacking)". There doesn't appear to be any dark marking at the end of P10.