The things that open and close and look a bit like a mouth at the end of the abdomen of the fly are probably "claspers". Only male insects have these. Claspers are used for grabbing the female during mating. The female has a long barb like a stinger at the end of her abdomen. This is called an "ovipositor" and is used to help her lay eggs in the soil or on surfaces like leaves.
Click Here to return to the search form.