---

Now I took a deeper look into Zaitzev's paper from 1991 and especially his key. It seems that the only stressed difference between K. testaceus and K. tuvensis is the shape of the median ventral outgrowth of the gonocoxites. However, Kjærandsen et al. (2007) state that these differences are within the limits of variation in K. testaceus and consider K. tuvensis as well as K. dispar probable junior synonyms of K. testaceus - see p. 20 of http://www.online...Sweden.pdf. If this is true, even preparation of the genitalia of your fly would not shed any more light on species identification. If you label it "K. testaceus sensu lato" you are on the safe side!