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Promachus sp? - Promachus vertebratus

Promachus sp? - Promachus vertebratus
Prairie Center, Johnson County, Kansas, USA
July 22, 2007
I think this is a different species than P. vertebratus, the tibia are red and the eyes look different. I was amazed to see a Robber, not this one, take down and instantly kill a female Common Whitetail!

Moved from Giant Robber Flies.

Moved from Robber Flies.

Well, the eyes are not very helpful and in life can be an amazing range of colors based on the light. The tibia in vertebratus are supposed to be contrasting with the femurs and may be orange to reddish. There are two species in KS that I know nothing about and don't have info on, P. dimidiatus and P. oklahomensis. Whether they are in the bastardii group or the hinei group is unknown to me as well. And I have seen Promachus in this group take adult Halloween Pennants.

I sent the photo to an expert who might be able to ID it for us. Alas, his specialty is European Asilids, so he might not be able to, but a positive ID plus his comments would be invaluable to Bugguide in terms of identification.

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