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Hi Nikita,

From the key of P. Withers (The British species of the genus Suillia (Diptera, Heleomyzidae), including a species new to science.-- Proc. Trans. Br. Ent. Nat. Hist. Soc. 20, 1987: 91-104), the following pictures give the difference between "arista with very long hair" (VI) and "arista with long hair" (VII). Maybe this will be of some help to you!

By the way, your specimens looks like Suillia variegata to me, but I'm no specialist.

Jan Willem