Baconia adebratti, 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 : 183-185

Baconia adebratti sp. n. Figs 50 D–E 51D, F, I–JMap 15

Type locality.

Malaysia: Sabah: Sipitang: Mendolong [exact locality uncertain].

Type material.

Holotype male: "Malaysia: Sabah,Sipitang, Mendolong. T6/R, 31.III.1989, leg. S. Adebratt" / "Caterino/Tishechkin Exosternini Voucher EXO-01771" (LUND).

Diagnostic description.

Length: 1.5mm, width: 1.2mm; body elongate oval, moderately 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 absent; antennal scape short, club nearly circular; epistoma faintly emarginate apically; labrum about 3 ×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 four-fifths, pronotal disk weakly depressed in anterolateral corners, ground punctation fine, with conspicuous secondary punctures interspersed throughout, becoming larger and denser toward sides and prescutellar area; elytra with two epipleural striae, outer subhumeral stria absent, inner 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 slightly extending anteriorly into basal arch of 4th, sutural stria present in middle one-third, abbreviated at base and apex, elytral disk with scattered secondary punctures in apical one-fourth, extending anterad between 5th and sutural striae; prosternum moderately broad, keel shallowly emarginate at base, convex, smooth, carinal striae convergent anterad, joined in broad anterior arc just beyond midpoint; prosternal lobe about two-thirds keel length, apical margin rounded, slightly deflexed, with marginal stria present only at middle; mesoventrite produced at middle, with marginal stria complete; mesometaventral stria arched forward, detached laterally from inner lateral metaventral stria which extends straight posterad to inner corner of metacoxa, curving mediad at posterior apex, outer lateral metaventral stria present, parallel to inner stria, complete; metaventral disk moderately coarsely punctate at sides, impunctate at middle; abdominal ventrite 1 with complete inner lateral stria, outer stria absent, ventrites 2-5 with sparse punctures at sides, much finer across middle; protibia with very weak marginal spines, more or less linear, its outer margin serrulate; 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 uniformly interspersed, propygidial gland openings inconspicuous; pygidium with sparse ground punctation becoming denser apically, with slightly coarser secondary punctation denser toward base. Male genitalia (Figs 51D, F, I–J): T8 with base narrowly, rather deeply emarginate, ventrolateral apodemes with inner apices separated by about one-half T8 width, projecting beneath nearly to ventral midpoint, obsolete apically, apical margin shallowly emarginate; S8 with halves fused along midline, basal emargination broad, narrowed to subacute, basal apodemes narrowly rounded, sides subparallel, weakly arcuate, apices narrow, obliquely truncate, setose, widely separated by deep, acute apical emargination; T9 with short basal apodemes, halves well separated dorsally, ventrolateral apodemes bluntly produced beneath, nearly meeting, apices narrowly rounded, with single subapical seta on each side; T10 elongate; S9 with long narrow, medially keeled stem, head abruptly widened near apical one-fourth, sides parallel to subacute apices, apical emargination broad, shallow, sinuate; tegmen with sides slightly widened from base, subparallel in most of two-thirds, weakly narrowed to apex, apices narrowly rounded, tegmen evenly curved in lateral aspect; median lobe about one-fourth tegmen length, with eversible subapical denticles; basal piece about one-third tegmen length.

Remarks.

This species is very similar to Baconia wallacea , in that the inner lateral metaventral stria is strongly curved mediad at the apex, and it has large, shallow punctures in antescutellar area. The united prosternal striae (Fig. 50E) of Baconia adebratti will distinguish it, and it also differs in body shape, being wider toward the front (Fig. 50D), and in protibial dentation, with the protibia of Baconia adebratti more or less lacking marginal denticles.

Etymology.

This species is named in honor of Swedish entomologist Stig Adebratt (1927-2002), whose voluminous collections in Borneo resulted in numerous new histerid species.