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I don't have the paper by Bowden. You can rule out some species with two later papers:

Dils, J. and H. Özbek. 2006. A new species of the genus Conophorus (Diptera:
Bombyliidae) from Turkey. Phegea 34:107-110. https://www.biodi...pdf/167755
Hasbenli, A. et al. 1998. Conophorus aktashi sp.n., A new Species of the Bombyliidae (Diptera) from Turkey. https://www.resea...rom_Turkey

There is also a 1995 paper by Hasbenli and Aktaş in one of the Gazi University journals, "Contributions to Conophorus MEIGEN, 1803 species of Turkey". I have not seen it online.