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Photo#20403
We're thinking Tabanid -- but we're wrong! - Didea fuscipes

We're thinking Tabanid -- but we're wrong! - Didea fuscipes
Harms Woods Forest Preserve, Glenview IL, Cook County, Illinois, USA
April 23, 2005
Size: ~15mm
Tony, we saw this one, actually hanging under the branch, and immediately thought of your request for Tabanids. Don't have a clue what this is. This image is from the old digital camera. Hoping the images from the film camera are better. If so we'll replace this.

Images of this individual: tag all
We're thinking Tabanid -- but we're wrong! - Didea fuscipes We're thinking Tabanid -- but we're wrong! - Didea fuscipes

Moved
Moved from Didea.

Look at the antennae
The dorsal hair sticking up from the antennae is a characterisric for certain families; it's called a 'dorsal arista'. Not found in the more 'primitive' families including tabanids. It's the 1st character one should look for as it narrows down the families.
Anthony W. Thomas

Didea?
This looks pretty similar to Didea fuscipes in the Syrphidae of Ontario. The hairy thorax, bulging face, and abdominal pattern all seem to match.

 
Didea fuscipes - band on terg
Didea fuscipes - band on tergite 4 is entire (see Vockeroth 1983). D. alneti has that band divided.

 
dip in vein
And we can convince ourselves that we see that little dip in the wing vein too! Nice work!

Joel, we asked Herschel to comment some more on the Asilidae and moved things into the taxa he provided. You may need to revisit there and move taxa around according to the hierarchy you're using.

Thanks again,

Syrphid
Syrphid. Tough after this.

Syrphid?
The fly's shape and what I can see of the wing veins remind me more of a syrphid fly than tabanid. Of course, I would like to hear from those with expertise.

 
That makes sense
Guess we just weren't expecting to find a syrphid so large, but couldn't make sense of the coloration for Tabanids. We'll move it over to Syrphidae. Hope the film images will help with the ID when we get them posted.

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