This picture was taken about 10:30AM. The temp outside was in the low 60's. The overnight temp in the garage (where I over-nighted it in a jar) was in the upper 50's. I think the tail up is nothing special, just part of its cleaning posture. I had washed the specimen jar earlier in the day, setting it aside to air dry. It still had a few drops of water in it when I caught the fly. When I opened the jar in the morning, the fly was on its back, wings stuck to the few drops of water on the bottom of the jar. I turned the jar upside down over some Rhoddie leaves, and the fly fell on the leaves. I watched and photographed as it dried itself; it was fairly soaked. It raised its abdomen like that each time it used its hind legs for cleaning.

Very impressive fly to see live - large and beautiful.   :-P)