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Here is Michael Ackland's key for Eustalomyia (m&f):

1 Legs and palpus partly yellow............................................................................................................ vittipes Zett.
– Legs and palpus completely black......................................................................................................................... 2
2 Arista long haired, the length of the hairs on upper and lower side are each equal to width of postpedicel. Mid
vitta of scutum widened behind into a rounded spot............................................................................ hilaris Fall.
– Arista short haired or pubescent. Mid vitta of scutum equally wide throughout ................................................... 3
3 The length of hairing of arista in total equal to width of postpedicel. Hind tibia with 7 av setae.........festiva
– Hairing of arista significantly shorter, the arista is only pubescent. Hind tibia with 12 av setae..........histrio Zett.

You may be able to do it from your photos...