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Gymnosoma nudifrons

Most parasitic flies have firm and long hairs all over their body, but not all. The one to the right is almost hairless. It belongs to a group of parasitic flies that are almost hairless. its larva eats bugs. In my part of the Netherlands this is the only Gymnosoma species looking like this present. In the south of Limburg however a second species may turn up, which is very similar to this one indeed (Gymnosoma rotundatum). All other Gymnosoma species in Holland can be told apart. The males of Gymnosoma nudifrons have striking golden yellow hairs on the first part of the thorax. The male is in the top pictures, the female is in the other pictures.