Posted by ebbek on 02-12-2013 20:17
#4
When i look in Bächli & Burla (Insecta Helvetica 7, 1985) I come to D. ambigua, but I am not sure at all. Could it be a possible species? It is difficult to take pictures on the characters, but here is a photo on wing (and costa). Skutum is "einfarbig schiefergrau" and "tergite dunkel lateral". But perhaps it is necessery to see the genitals to be sure (which I have not prepared)?
Krister
Edited by ebbek on 02-12-2013 20:24