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Hello Carlo,
for researching Bombylidae and other diptera of the Mediterranean region I use:

Galerie du Monde de Diptéres: https://galerie-i...ae_01.html

Website of Alain Ramel: http://aramel.fre...r-11.shtml

A. KATBEH-BADER & S. ARABYAT (2002): The bee flies of Jordan, download here: https://www.zobod...3-0384.pdf

and Phthiria sp. key for Swiss fauna: https://scnat.ch/...and_6_2013