episternum

Prothorax: a, Episternum. b, Sternum. c, Coxa of fore-leg. d, Pronotum.

Mesothorax: e, Prescutum. f, Scutum. g, Scutellum. h, Post-scutellum. i, Mesophragma. j, Epimeron. k, Episternum. l, Coxa of middle leg.

Episternum, ep-i-ster′num, n. the interclavicle: the epiplastron: the presternum of mammals.—adj.

Episternum: the anterior and larger lateral thoracic sclerite between the sternum and notum.

Parapteron -era: small sclerites, articulated to the dorsal extremity of the episternum, just below the wings; absent on prothorax = the tegulae of Hymenoptera, and patagia of Lepidoptera: have been homologized with the elytra of Coleoptera.