Baconia barbarus (Cooman, 1934)

Caterino, Michael S. & Tishechkin, Alexey K., 2013, A systematic revision of Baconia Lewis (Coleoptera, Histeridae, Exosternini), ZooKeys 343, pp. 1-297 : 174-175

Baconia barbarus (Cooman, 1934) Figs 49 C–DMap 15

Binhister barbarus Cooman, 1934: Baconia (Binhister) barbarus : Mazur 1984: 26.

Type locality.

VIETNAM: Hoa-Binh [20.8°N, 105.3°E].

Type material.

Holotype, sex undetermined (MNHN): "Hoa-Binh, Tonkin, 1922, P.A. de Cooman".

Diagnostic description.

Length: [not measured, ~1.9mm], width: [not measured, ~1.2mm]; body elongate oval, weakly convex, glabrous; color rufopiceous, with faint metallic sheen; head with frons flat, wide, ground punctation fine, secondary punctures sparse with numerous coarser punctures denser dorsad, frontal stria present only along inner margin of eye, obsolete across middle; antennal scape short, club nearly circular; apical margin of epistoma straight; labrum about 4 ×wider than long, weakly emarginate apically; both mandibles with strong, acute basal tooth; pronotum with sides weakly convergent, rounded to apex, lateral marginal stria merging with lateral submarginal stria one-fourth from anterior corner, continuous anteriorly with complete anterior marginal stria, pronotal disk weakly depressed in anterolateral corners, fine ground punctation interspersed with rather coarse secondary punctures throughout, only slightly sparser in front of scutellum; elytra with one complete epipleural striae, outer subhumeral stria absent, inner subhumeral stria present as short basal fragment, dorsal striae 1-4 complete to base, progressively shortened apically, 4th stria arched toward sutural in front, stria 5 slightly abbreviated at base and apex, sutural stria present in middle half, abbreviated at base and apex, elytral disk with scattered secondary punctures in apical one-third; prosternum moderately broad, keel emarginate at base, with carinal striae subparallel, separate throughout; prosternal lobe about two-thirds keel length, apical margin rounded, with marginal stria present only at middle; mesoventrite weakly produced at middle, with marginal stria interrupted for width of prosternal keel; mesometaventral stria arched forward, subangulate at middle, continuous laterally with inner lateral metaventral stria which extends straight posterad to inner third of metacoxa, outer lateral metaventral stria barely indicated behind mesocoxa; metaventral disk coarsely punctate at sides, impunctate at middle; abdominal ventrite 1 with two complete lateral striae, disk with only very fine ground punctation; protibia tridentate, the teeth rather evenly spaced, weak, outer margin serrulate between teeth; mesotibia with two weak marginal spines; outer metatibial margin smooth, edentate; propygidium lacking basal stria, with sparse, fine ground punctation, with coarse secondary punctures evenly interspersed, propygidial gland openings evident, located about one-third behind anterior margin, about one-fourth width from each lateral margin; pygidium with sparse ground punctation and slightly coarser, secondary punctation denser toward base. Male genitalia: not known.

Remarks.

Baconia barbarus is known only from the type specimen (Figs 49 C–D), of undetermined sex, but it may be adequately diagnosed on external characters from several close relatives. It shares the marginal mesoventral stria being widely interrupted by the fine, anteriorly subangulate mesometaventral stria (Fig. 49D) only with Baconia reposita , below. In that species there is only a single lateral stria on the 1st abdominal ventrite, whereas Baconia barbarus has two, and the outer lateral metaventral stria of Baconia reposita is distinct and present for about one-third the length of the metaventrite, while being much shorter in Baconia barbarus .