Mesoleptus

Mesoleptus is a genus of parasitic wasp in the family Ichneumonidae with a wide geographic distribution.

The antennae of its members are typically long, slender, and usually curved. The head is short and narrow with oval, slightly protruding eyes. The thorax is somewhat humped, with small wings. The cellules of the wings, which are small enclosed areas between veins, are either very small or entirely absent. It is characterized by the narrowed abdomen referred to as a petiole. Abdomen shape is usually oblong and smooth. The legs are slender and long, although the hindmost leg can be thickened.