SEM images, head of Pselaphus heisei. (A) dorsal view; (B) ventral view; (C) lateral view. Abbreviations: ce, compound eye; fcl, frontoclypeal lobe; fhs, flattened hyaline setae; fp, frontal pouch; fr, frons; ge, gena; gs, gular sutures; lp, labial palp; lr, labrum; md, mandible; mf, median furrow; mp1–4, maxillary palpomere 1–4; mt, mentum; nr, neck region; occ, occipital constriction; pe, pedicellus; sc, scapus; smt, submentum; vt, vertex.