Baconia burmeisteri (Marseul, 1870)

Caterino, Michael S. & Tishechkin, Alexey K., 2013, A systematic revision of Baconia Lewis (Coleoptera, Histeridae, Exosternini), ZooKeys 343, pp. 1-297 : 210-211

Baconia burmeisteri (Marseul, 1870) Figs 58 D–EMap 19

Pachycraerus burmeisteri Marseul, 1870: 76; Baconia (Binhister) burmeisteri : Mazur 1997: 26.

Type locality.

BRAZIL [exact locality unknown].

Type material.

Lectotype, sex undetermined, here designated (MNHN): "Carcinops [sic] burmeisteri, Brésil, Hag, 67" / “Bresil” / “G.H.62” / "Museum Paris Coll. de Marseul 2842-90" / "LECTOTYPE Pachycraerus burmeisteri Marseul, 1870, M.S.Caterino & A.K.Tishechkin des. 2010". This species was described from an unspecified number of specimens, and the lectotype designation fixes primary type status on the only known original specimen.

Other material.

BRAZIL: 1: Rio Grande [do Sul]: 22.ii.1884, tabac, A. Grouvelle (BMNH).

Diagnostic description.

Length: 1.6mm, width: 1.1mm; body elongate, sides subparallel, weakly depressed, conspicuously punctate on most surfaces, most punctures bearing single short, fine seta (usually abraded on dorsal and ventral surfaces, more persistent on pygidia); color weakly metallic blue-green, shining; head with frons produced in front, elevated over antennal bases, epistoma strongly convex, weakly depressed at middle by high density of punctures, frontal stria broadly interrupted between antennal bases, present along inner edge of eyes, supraorbital stria absent; antennal scape short, subpyramidal, club short, sides rounded, apex subtruncate; epistoma straight across distal margin; labrum about 2 × wider than long, rounded at sides, apical margin entire; mandibles strong, rather bulky, each with median tooth; pronotum with sides subparallel in basal three-fourths, rather abruptly narrowed to apex, lateral marginal stria continuous around sides and front, lateral submarginal stria very close to marginal stria, merging near anterior corner; pronotal disk weakly depressed in anterior corners, punctation of disk coarse, more or less uniform, slightly denser toward sides; elytra with inner epipleural stria complete, outer subhumeral stria absent, inner subhumeral stria very short, basal, dorsal striae 1-4 complete, 5th stria absent, sutural stria more or less complete, though slightly abbreviated at apices; elytral disk with sparse secondary punctures throughout, denser in apical fifth; prosternal keel narrow, depressed between coxae, very weakly produced, carinal striae subparallel in basal third, united at base, diverging anterad; prosternal lobe short, less than half keel length, truncate to shallowly emarginate apically, marginal stria obsolete at sides; mesoventrite shallowly emarginate at middle, marginal stria complete; mesometaventral stria absent from middle, inner lateral metaventral stria continuing from mesoventral marginal stria to middle of metacoxa, outer lateral metaventral stria paralleling inner stria for short anterior distance; mesometaventral and abdominal ventral disks with sparse secondary punctures throughout; abdominal ventrite 1 with complete inner lateral stria and outer lateral stria in apical half; protibia rather broad, curving, with 5-6 marginal denticles, margin not serrulate between; mesotibia with 3-4 marginal spines, the basal-most weak; outer metatibial margin with 1 or 2 weak submarginal spines, setose; propygidium lacking basal stria, propygidial gland openings evident about one-fourth from anterior and lateral margins; propygidium and pygidium with coarse punctation throughout. Male genitalia: not known.

Remarks.

This species is very similar externally to Baconia insolita in most characters. Aside from their widely disjunct distributions, Baconia burmeisteri can easily be recognized by its metallic coloration (Fig. 58D), weakly produced prosternal keel (Fig. 58E) and slightly more convex form.

The localities for this species are poorly documented, and the type locality cannot be specified beyond the country of Brazil. Grouvelle’s collection from 'Rio Grande’ is most likely from Rio Grande do Sul, as many of the species he collected and described originated in this state.