met·a·tho·rax 
(mĕt′ə-thôrăks′)
(mĕt′ə-thôrăks′)n. pl. met·a·tho·rax·es or met·a·tho·ra·ces (-thôrə-sēz′)
The hindmost of the three divisions of the thorax of an insect, bearing the third pair of legs and the second pair of wings.
met′a·tho·racic (-thə-răsĭk) adj.