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Hi Nikita

Sorry, it's a common abbreviation for Tergites 1+2, the 2 fused tergites that make up the first visible segment on the abdomen, just behind the scutellum. In most species there is a 'dent' or 'depression' in this tergite and one of the keying features is to note if the depression reaches the posterior margin of T1+2 :)

Hmm, with a fly of 10mm; apical scutellars that are crossed so much; and light palps (not black) it might not be Leiophora after all. :(