This fly was quite dead and may have been slightly bloated from too much time floating in the pool. But, it shone like a silver coin and seemed somewhat unique, so I couldn't resist getting some photos. This first shot shows the reflective quality of the abdomen when directly in the sun, the next one shows less direct light, and the third one is entirely in shade. I took the final image after actually removing the fly from the water, and the abdomen definitely seemed to deflate quite a bit at that point (but it's still so shiny!). I'm hoping that the clear wing venation will be enough for someone to help me get this one to family. Thanks!

Mixed oak & chaparral habitat.