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It is a female and female pusilla don't have a black vitta and abdomen and do have a strong belly. That' s whynai though it was interrupta.
But I must admit: I cannot see the typical thoracic pattern normthe number of sternopleural bristles.
Now I look at large magnification: I think you can see some stubby spines on the ventral,side of tergite 3, but may be that is just me.

Theo