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Longlegged Fly - Condylostylus

Longlegged Fly - Condylostylus
Mill Creek Nature Center, Gwinnett County, Georgia, USA
August 14, 2004
I was having a difficult time getting a shot of these flies. They would land and do their little dance on the foliage, and as soon as I pressed the shutter release the preflash would spook them away. I usually ended up with an empty leaf, but I quite by chance caught one in mid air here.

This one had clear wings and longer antennae, but was found associating with another one with patterned wings and shorter antennae. Sexual dimorphism?

Images of this individual: tag all
Longlegged Fly - Condylostylus Longlegged Fly - Condylostylus

Moved from Sciapodinae.

After Bickel's revision of Sciapodinae Chrysosoma is no longer used for the New World species with very long antennae.

On a great shot! That is one perfect click of the shutter right there!

There are three options:
1. Different species: The one with the long antennae could belong to Chrysosoma, the other two to Sciapus (they apparently have only two scutellar setae and Sciapodinae with only two scutellar setae belong in that genus).
2. Diferent sexes: The flying specimen is a female, no doubt about that. The other two I cannot be certain, but it could well be that the one with marked wings is a male. In that case I would not be suprised if the two presumed Sciapus specimens were male and female of the same species, though I have no knowledge of sexual dimorphism in wing pattern. (Mind you, our European Sciapodinae fauna is rather uniform in that respect: no wing markings.)
3. All different species: But with the remark I made under 1 still in tact.

If I assume the one with the marked wings did the dancing and the ones with clear wings reacting to that, the one with the shorter antennae in a different way than the one with the longer antennae, am I far off?


Thanks Paul
I could be wrong, but I believe the one with clear wings is the same individual as the one in midflight. At least that's what I remember. It could be that they did a switcheroo on me while I had my eye to the camera :).

I just remember they were both flitting around in the same clump of vegetation. It sounds like they probably are different species, which is not too surprising. I don't remember any particular interaction between them other than both being there.

One way or other I cannot quite make out any long antennae (or rather aristas) on the specimens on the leaves. Maybe you can see on the original image?


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