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Thank you, John. The first paper is about C. nobilis group, flies with 3 r cells. C. actashi also differs from my fly (black haltere knob, long proboscis).
I found 14 Turkey Conophorus species listed in a few publications (Hasbenli and Evenhuis 2000, Dils and Özbek 2006 a, Dils and Özbek 2006 b ). I used the key of Zaitsev (Zaitsev 1966. Parasitic flies of the family Bombyliidae (Diptera) in the fauna of Transcaucasia), which covers the major part of Turkey species and also some other publications. 7 species have 3 r cells (C. nobilis group): C. anatolicus, C. bombyliformis, C. gracilis, C. nobilis, C. rjabovi, C. simplex, C. syriacus. 4 species have black haltere knob (my fly has entirely yelow haltere): C. aktashi, C. anatolicus, C. rossicus, C. virescens. C. glaucescens has diffferent scutellum (some nice photos in Inaturalist), C. bivittatus has spotted wings. According A. Hasbenli description (1995 https://www.researchgate.net/profile/Abdullah-Hasbenli/publication/289673103_Turkiye_Conophorus_Meigen_1803_Turlerine_Katkilar_Diptera_Bombyliidae/links/569fbbfc08ae2c638eb7c00f/Tuerkiye-Conophorus-Meigen-1803-Tuerlerine-Katkilar-Diptera-Bombyliidae.pdf), C. asiaticus looks different to me, but I am not expert. The last species C. storthus is endemics for Turkey and unfortunately I did not found any description. So it seems that 12 species from the list can be exluded and the last two might be probable. Or possible a new species for Turkey.