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I wonder if it's a Kyrbia unicolor?
It seems to me, that the marginal bristles on tergite 4 are missing...
size ca. 5mm, glossy black (maybe with slight bronze hue)

08.IV.2012
Ukraine, Kharkiv region, 50°5'25.4"N 36°26'29.6"E
edge of the pine forest stand, walking on leaf litter




P.S. I hope it's not merely Paykullia maculata ;)