prothoracic

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pro·tho·rax

P0615800 (prō-thôr′ăks′)n. pl. pro·tho·rax·es or pro·tho·ra·ces (-thôr′ə-sēz′) The anterior division of the thorax of an insect, bearing the first pair of legs.
pro′tho·rac′ic (-thə-răs′ĭk) adj.

prothoracic

(ˌprəʊθɔːˈræsɪk) adj (Zoology) relating to an insect's prothorax