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Hi Jfdocampo,

Habitus and 'M' shaped mark on frons indicate the genus Desmometopa. The pale haltere, yellow basal tarsal segments on mid and hind leg, yellow cheek without black shining mark and basal pale palpus indicate: Desmometopa varipalpis Malloch, 1927.
From the first photo I'd say a female. Nice find!

Regards,

Ectemnius