Photo 9: adult LBBG intermedius, June 17 2001, Missouriweg Maasvlakte, the Netherlands.

Note the brown hue on the dark upper-parts. Normally, this is not shown in graellsii and Dutch intergrades. Fuscus and several populations of intermedius show such brown hue in the upper-parts, see the Distribution Section.
Long wings and elongated, delicate and elegant look favor intermedius over more robust Dutch intergrades, though there is much overlap (most overlap in smaller females of the Dutch intergrades).