A review of the baconii species group of the termitophilous genus Orthogonius Macleay (Coleoptera: Carabidae: Orthogoniini) Author Tian, Mingyi Author Deuve, Thierry text Zootaxa 2016 4093 1 118 126 journal article 10.11646/zootaxa.4093.1.7 8652e390-2632-4818-898f-451002b4bcdd 1175-5326 260680 706D3EFA-FAA6-42E1-8257-F3018AC7F31A Orthogonius baconii Chaudoir, 1871 Figs 3–5 Chaudoir, 1871: 109; Andrewes, 1930: 246; Csiki, 1932: 1587; Bates, 1892: 401 Description. Length: 11.0 mm; width: 5.0 mm. Habitus as in Fig. 3 . Small size for Orthogonius , dark brown, lateral marginal bead of pronotum and elytra lighter, underside yellowish brown; moderately shiny, head faintly and irregularly striated; head, pronotum and elytra punctate, with punctures small on head, moderate on pronotum and elytra; microsculptural meshes densely isodiametric. Head broad, HW/HL=1.25; compound eyes very large and prominent, frons and vertex strongly convex, clypeus bisetose, frontal margin of labrum straight, frontal impressions small, frons and vertex flat, neck short; ligula bisetose at apex, palps subcylindrical, glabrous, labial palpomere 2 and 3 subequal in length, labial palpomere 2 bisetose on inner margin; maxillary palpomeres 3 and 4 subequal in length; antennae rather short and stout, reaching over humerus of elytra; antennomere 1 unisetose, slightly longer than antennomere 3, but subequal to each of antennomeres 4–11; flatly dilated from antennomere 4, with an indistinct longitudinal stripe along antennomeres 4-10. FIGURES 3–5. Orthogonius baconii Chaudoir (3. Habitus; 4. Aedeagus, right lateral view; 5. Apical lamella, dorsal view) Pronotum strongly transverse, PW/PL=1.94, both fore and hind angles rounded, base distinctly wider than front, PbW/PfW=1.36; base and front bordered; lateral expanded margins wide and slightly reflexed; punctures sparser on disc, denser on and near basal fovea and lateral expanded margins. Elytra broadly elongate-ovate, EL/TW=1.46; humerus quadrate, base well bordered, apex broadly truncated; inner apical angle slightly re-entrance, sutural angle denticulate; striae fine and deep, intervals convex, odd and even intervals from 2-6 subequal in width; interval 3 of elytra with three setiferous pores; prosternal process well bordered at apex; meso-coxa asetose medially, fore tibia dilated at apex, with outer apical angle distinctly produced; all legs with claws pectinate; abdominal ventrite VII with apical margin complete in male. Male genitalia ( Figs 4–5 ): The median lobe of aedeagus short, moderately expanded ventrally in middle, gently curved towards apex, apex very small though distinctly blunt in profile; in dorsal view, apical lamella is wide and flat, distinctly longer than wide, widely obtuse at apex. Materials studied: ♂, Holotype , India (MNHN)? 1 ♂ , “C. E. Br.”, “Soc. Ent. Belg. Coll. Putzeys” (IRSNB); 1 ♂ , “Nilgiri Hill”, “803”, “H. E. Andrewes Coll. B. M. 1945–97 ”, from India , with Andrewes’ label “ insularis group” (NHML); 1 ♂ , “N. W. India ”, and with Andrewes’ label “ Orthogonius baconii ?” (NHML). Distribution. India .