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Village of San Leanna (south Austin), Travis County, Texas, USA
January 23, 2009
Size: 4-5 mm
Det. Jason Botz, 2020

At lights in small mesic patch under an oak-willow canopy...

not P. vaccini
Moved from Parthenicus vaccini.

I compared the image with the holotype of P. vaccini. It's not that species. I suspect it may be one that is undescribed (there are a lot of those still, especially from Texas west).

Moved from Parthenicus.

Moved from True Bugs.

I reviewed the western Parthenicus species key of Knight, 1968
But, it seems that there is no matching western species. In addition, I became pretty sure of the ID after seeing the photo of P. vaccinishown in Henry, 1982. It is more similar to your bug than that in Henry, 2007 (1).

Only one problem is the distribution. According to Henry, 2007 (1), it occurs "eastern coast, west to Michigan in the north," and there is no record in Texas. But...

Parthenicus vaccini
I suggest, based on the key and the photo given by Henry (1) and the original description written by Van Duzee.

In the meantime, can I apply eatern species key to your area? If not, I am much less sure of the suggested ID.

E. keys s/b okay for Austin...
Eastern keys should be okay for Austin... Mike

Then, it's definitely P. vaccini.
The dots on the antennae are unique for this species. There is no other estern Parthenicus species having such dots.

Although some of other genera in Phylinae have dotted antennae, they have different shapes. ^^

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