Baconia bigemina, Caterino, Michael S. & Tishechkin, Alexey K., 2013

Caterino, Michael S. & Tishechkin, Alexey K., 2013, A systematic revision of Baconia Lewis (Coleoptera, Histeridae, Exosternini), ZooKeys 343, pp. 1-297 : 182-183

Baconia bigemina sp. n. Figs 50CMap 15

Type locality.

MALAYSIA: Sabah: Poring Hot Springs [6.04°N, 116.70°E].

Type material.

Holotype male: "SABAH: Poring Hot Springs, 500 m 6.V.1987 Burckhardt - Löbl” / "Caterino/Tishechkin Exosternini Voucher EXO-01772" (MHNG).

Diagnostic description.

Length: 1.8mm, width: 1.3mm; body elongate oval, weakly convex, glabrous; color rufobrunneus; head with frons flat, wide, ground punctation fine, secondary punctures sparse with coarser punctures dorsad, frontal stria present only along inner margin of eye, obsolete across middle, supraorbital stria present; antennal scape short, club nearly circular; epistoma straight to faintly emarginate apically; 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 descending to ventral edge in posterior half, continuous anteriorly with complete anterior marginal stria, lateral submarginal stria present in basal three-fourths, pronotal disk weakly depressed in anterolateral corners, with fine ground punctation, conspicuous secondary punctures interspersed throughout, becoming vaguely larger toward prescutellar area; elytra with two complete epipleural striae, outer subhumeral stria absent, inner subhumeral stria present in basal one-fifth or less, dorsal striae 1-4 complete to base, vaguely abbreviated apically, 4th stria arched to sutural in front, recurved slightly posterad along extreme anterior part of suture, stria 5 extending anteriorly into basal arch of 4th, sutural stria present in middle one-half, abbreviated at base and apex, elytral disk with scattered secondary punctures in apical one-fourth; prosternum moderately broad, keel weakly emarginate at base, convex, smooth between fine, complete carinal striae, carinal striae divergent basally and apically; prosternal lobe about one-half keel length, apical margin rounded, slightly deflexed, with marginal stria present only at middle; mesoventrite weakly produced at middle, with marginal stria complete; mesometaventral stria transverse, continuous laterally with inner lateral metaventral stria which extends straight posterad to inner corner of metacoxa, outer lateral metaventral stria present, parallel to inner stria, complete; metaventral disk coarsely punctate at sides, impunctate at middle; abdominal ventrite 1 with complete inner lateral stria, small fragment of outer stria may be present, disk with few coarse secondary punctures along anterior margin, ventrites 2-5 with sparse punctures at sides, finer but conspicuous across middle; protibia tridentate, the middle tooth very reduced, closer to apical tooth than basal, outer margin serrulate between teeth; mesotibia with two very weak marginal spines; outer metatibial margin smooth, edentate; propygidium lacking basal stria, with sparse, fine ground punctation, with moderately coarser secondary punctures evenly interspersed, propygidial gland openings narrow, obliquely elongate, located about one-half behind anterior margin, about one-fourth pygidial width from each lateral margin; pygidium with sparse ground punctation becoming denser apically, with slightly coarser secondary punctation denser toward base. Male genitalia essentially indistinguishable from that of Baconia chujoi (see Fig. 51).

Remarks.

This species is very similar to the preceding, Baconia wallacea , but differs in having the inner lateral metasternal stria straight to the apex (Fig. 50C), not curved mediad, the outer lateral metaventral stria incomplete, and the prosternal striae complete and separate anteriorly.

Etymology.

The name of this species means ‘doubled’, referring to the metaventral striae, though this is not unique to the species.