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I had to go upstairs to my study. I have here the two vials with me. I did not pin or glue the specimens yet. ;)
Are you sure the specimen on the photo is the same one as I have here? The spines on the costa of the fly on the picture are quite big, while bicolor has much smaller ones. I can't see more details on the photo. The specimen in the vial is a normal bicolor, with the small hairs on the scutellum, which can sometimes be very difficult be seen.