The Same, or Different?

In July I posted an image with some flies doing a mating dance.  This was one of those photos.

I did not know what it was at the time, but I posted a photo to bugguide and it was identified as Euaresta bella.

Sunday I found this fly, in about the same location of the prairie.  It seemed a little more yellow but looks pretty similar.

So are they the same, or are they different?

There is actually a key that I will go through at some time in the future.  The problem is there are a lot of words that I will have to look up the definitions for, and I am not sure I have a photograph with a good enough angle to get a good ID.  One characteristic, the color of the thorax, leads me to think this is Eurasta festiva.

But I will save the full key for some time when I am a little less busy.

Sometimes differences between species are quite subtle.  Both species are thought to live on the seeds of ragweed.


About the roused bear

Nature photographer from central Iowa.
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