Posted by ValerioW on 18-07-2016 08:02
#5
Sundew wrote:
Sphegina is a very tricky genus! Ball & Morris (British hoverflies. 2013) write:
"There are three very similar species: S. clunipes, S. elegans, and S. verecunda. S. elegans has rather yellow than dark humeri. ... Separating females of S. clunipes and S. verecunda is difficult and requires careful examination of the wing venation."
Separating
verecunda from
clunipes can also be possible with face's colour and tergite's length (theoretically no need to check wing's venation; in Sweden, so I guess in Norway too, there's not
S. nigra).