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5013223 - Litargus tetraspilotus

5013223 - Litargus tetraspilotus
Morton Arboretum, nr cook County, Illinois, USA
August 14, 2005
Size: ~3/16"

Moved from Litargus.

This beetle's elytra appear to have very fine striations.

Good job.
You've added another to the family. I'll move it to genus page.

Mycetophagidae: Litargus sp.?
Looks like a mycetophagid, with Litargus having several species with spots on the elytra.

L. tetraspilotus, most likely

Not a nitidulid?
I would have thunk it a sap beetle. How do you distinguish between the two families, please?

Mycetophagidae vs. Nitidulidae
Eric: Nitidulids typically have the antennal club very compact (a rounded ball), and at least the apical tergite of the abdomen clearly exposed by the (usually) apically truncate elytra. Those nitidulids with more evenly rounded elytral apices have their own distinctive form, and have quite differently elytral patterns. Mycetophagids have the club more spread out, and the elytra are never truncate (not easy to see in this view). I have never seen a nitidulid with this color pattern, while it is quite typical of Litargus tetraspilotus. However, from the view I wasn't willing to make that identification, especially since there are other patterned species of Litargus, and I don't really know what is in Illinois.

That was my first guess too, Eric.

I also thought maybe it was a
I also thought maybe it was a Nitidulid.

Thanks very much for the IDs.
Thanks very much for the IDs. This is a new family for me. I wish I had gotten sharper shots of this and the Tritoma, but I often have difficulty with very small insects on plants.

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