http://home.hccnet.nl/mp.van.veen/bombyliidae/bombylius.html
https://diptera.info/forum/viewthread.php?forum_id=5&thread_id=46517
http://www.brc.ac.uk/soldierflies-and-allies/sites/www.brc.ac.uk.soldierflies-and-allies/files/Identification_bee_flies_Bombylius_v2_0.pdf
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