Still I do not know which is the hairy ball at the end of the ass of these flies (I asked Ivan to see if he knows) ... But I looked at my pictures from yesterday, and I've another fly in the same species, but with the end of the abdomen sword-shaped... what a thing! ... And it seems th fly are using this to lay eggs! ... (I put the photo in WORKSHOP, please watch it) **A bad photo, but useful to see the appendix.
Glaphyropyga bolivari - Ayala, 1983 (32)