Ambunticoris sulawesicus sp. nov. (Hemiptera: Heteroptera: Miridae: Bryocorinae: Eccritotarsini) is described from Sulawesi, Indonesia. Diagnosis, digital habitus images, illustrations of male and female genital structures, and scanning micrographs of diagnostic morphological structures are provided for the new species. Diagnosis of the tribe Eccritotarsini and placement of the genus Ambunticoris Carvalho, 1981 within this tribe are briefl y discussed.