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Boreothrinax - Boreothrinax maculipennis

Boreothrinax - Boreothrinax maculipennis
George Sims place, Douglas/Ozarks County, Missouri, USA
April 28, 2012
Size: maybe 5mm or so
Came to blacklight at night. Very Small. Could this be Pyrgotid (Light) Fly - Sphecomyiella

Moved from Pyrgotidae.

Moved from Sphecomyiella valida.

Oops, I think I may have been to hasty in my interpretation of the character "hind tibia tapered at base" in my comment below. The hind tibia might actually be closer to "strongly constricted in basal 1/3"...the angle of view in the image makes it hard to discern. And along with the lack of ocellar and postocellar bristles, this would then seem to go to genus Boreothrinax in the keys of the MND(1) and Steyskal (1978). It that case, this would appear to go to Boreothrinax maculipennis in Steyskal (1978), which is listed on BugGuide as Pyrgota maculipennis. Compare with:

Help and information. Thanks Aaron for rescuing this little fella from the stacks of the unknown. Your multiple view images of this one are really good. Next time I see him my goal will be to capture the kind of views you have.

Moved from Pyrgotidae.

Yes, Sphecomyiella
It's clear from the full-size version of your image that the shape of the wing cell "cup" in your specimen (see wing diagram here), together with the mottled wing pattern and the tapering hind tibia, leads to genus Sphecomyiella in the MND(1) key.

There are only two known species in this genus. One, S. valida, is widely distributed from the east coast west to Colorado and includes records from Missouri. The other species, S. nelsoni, is restricted to southern Arizona. Weren't you there recently? :-) Perhaps you saw something that looked like this:

Moved from ID Request.

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