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Black flying insect with tapping tail

Black flying insect with tapping tail
houston, Texas, USA
August 18, 2011
Size: similar to house fly
HI live in eastern Texas and see these critters appear around the summer (but only in recent years.) I've tried searching for a match but no such luck, yet. They're black, tiny(about the size of a normal house fly), flying insects with very long hind legs and a tapping tail which moves just like the "dippy bird" toy.

Moved from ID Request.

Black insect with long legs
I have lived in Texas all my life and I have never seen this insect until the past 5-8 years. I wonder where it came from? They sting or bite too.

May not be this exact species but...
...something along the lines of:
Cockroach Egg Parasitoid Wasp (Evania appendigaster)

Welcome to BugGuide!

oh wow, VERY similar! I wish
oh wow, VERY similar! I wish I had taken a better shot of the tail for comparison. Thanks mate :)

edit: upon inspecting another (blurrier) photo I took from a better angle, the tails do match exactly. Thank you so much! Now I don't have to fear these anymore.

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