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Photo#165322
Vanhorniidae - Vanhornia eucnemidarum - Vanhornia eucnemidarum - female

Vanhorniidae - Vanhornia eucnemidarum - Vanhornia eucnemidarum - Female
Tippecanoe County, Indiana, USA
June 15, 1977
Size: ca. 7 mm.
Caught in a malaise trap.

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Vanhorniidae - Vanhornia eucnemidarum - Vanhornia eucnemidarum - female Vanhorniidae - Vanhornia eucnemidarum - Vanhornia eucnemidarum - female

Eucnemid hosts
I found them in Wisconsin over 12 years ago. The best time to find these wasp to search out a large tree with exposed hard sapwood of deciduous trees like maples. In June, Eucnemids like Isorhipis obliqua or Isorhipis ruficornis are seen swarming all over the wood surface, maiting. These beetles are maiting and laying eggs in the crevices. The wasps come in and seek out the eggs where she inserts her own egg inside the beetle's egg. So far, parasitism is known only in these two eucnemid species.

Great
I'll have to watch for these.

 
This guy seems to match. (maybe)
Brad, can you please check this guy out. (below) It may be a male counterpart to this female. (above)
Check out the pronotal carina, head and body shapes, wing pattern, legs, etc...everything but the stinger.
I'm not sure of the gender, but it has about 11 flaglellomeres. (F1 is shorter than her's)

 
As the name implies, they par
As the name implies, they parasitize the larvae of Eucnemidae. So I assume they would be found near old wood lots where rotten wood would be available for the beetles.

By the way, I got the specimen in the photo from John MacDonald. I believe John is retired now from Perdue, but working with the museum.

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