From ZooTerms (Dictionary of Invertebrate Zoology)
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mesepisternum (noun; plural mesepisterna; Greek meros, middle; epi, on; sternum, chest): (Arthropoda: Insecta) 1. The area of the mesopleuron anterior to the mesopleural suture; sometimes divided into an upper mesanepisternum and a lower meskatepisternum; the episternum of the mesothorax. 2. In Diptera, horizontally divided into a large mesanepimeron but with a minute meskatepimeron below. 3. In Hymenoptera Ichneumonidae, usually termed mesopleurum.