Posterior cells: in Diptera (Will.): 1st radial 5 (Comst.): 2d = medial 1 (Comst.): 3d = 2d medial 2 (Comst.) 4th = medial 3 (Comst.): 5th cubitus 1 (Comst.). Posterior cephalic foramen: in Odonata, the opening of head posteriorly through which the cavities of head and thorax communicate. Posterior field: of tegmina, = anal field; q.v. Posterior intercalary: in Diptera, is one of the anal veins (Comst.). Posterior lateral margins: in Orthoptera, extend from base of pronotum downward to the posterior angle of sides. Posterior lobe: of the pronotum in Orthoptera, see lobe: in Diptera, that part of wing between axillary incision and base: = alar appendage (Loew). Posterior margin: = inner margin; q.v. Posterior pereion: the meta-notum. Posterior pleon: the terminal segments of the abdomen. Posterior pleopoda: the anal clasping legs of caterpillars: see planta. Posterior stigmatal tubercle: on thoracic and abdominal segments of caterpillars; varies in position from substigmatal to stigmatal posterior; sometimes united to V: it is IV of the abdomen, II of the thorax (Dyar). Posterior trapezoidal tubercle: on the thoracic and abdominal segments of caterpillars; subdorsal, posterior, always present, rarely united with I: it is II of the abdomen, lb of the thorax (Dyar). Posterior veins: those separating the posterior cells. Posterior wings: = secondaries: q.v. Postero-dorsal: Diptera; applied to leg bristles at the meeting of the dorsal and posterior face. Postero-ventral: Diptera; applied to leg bristles at the meeting of the ventral and posterior face. Postfurca: an internal process of metasternum to which the muscles of hind legs are attached. Post-gena: the sclerite below occiput and behind gena in some Orthoptera. Post-gula: is situated at the extreme base of the underside of the head in Dermaptera. Post-humeral bristles: in Diptera, are usually two, inserted above the dorso-pleural suture between the humeral callus and root of wing, on the bottom of the presutural depression. Postical vein: in Diptera, = 5th longitudinal (Meig.); = media 3 (Comst.). Posticus: hinder. Post-media: Ephemerida; an apparently distinct vein between media and Cubitus (Comst.). Post-medial line: in Lepidoptera, = t.p. line: q.v. Post-median: Diptera; those leg bristles situated above or behind the middle. Post-nodal cross-veins: in Odonata, the transverse veins between costa and radius 1, and radius 1 and media 1, from nodus to stigma, separating the post-nodal cells or spaces: = post-cubital cross-veins. Post-nodal costal spaces: in Odonata, the cells below costal margin from nodus to stigma. Post-nodal radial spaces: in Odonata, the cells between radius 1 and media 1, from nodus to outer margin. Post-nodal sector: in Odonata, a longitudinal vein lying between media 1 and media 2 (Comst.): = ultra-nodal sector. Post-oral: behind the mouth; those segments bearing mouth structures. Post-pectus: the under surface of the meta-thorax.