Baconia longipes, 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 : 228-231

Baconia longipes sp. n. Figs 6667Map 20

Type locality.

BRAZIL: Amazonas: Rio Tarumã Mirim [3.03°S, 60.28°W].

Type material.

Holotype male: "BRASIL: Amazonas, Rio Tarumã Mirim, 2km from Rio Negro, 3°02'S-060°17'W, 27July1979 - Igapo" / "Black water innundation forest canopy fogged with Pyrethrum" /"CANOPY FOGGING PROJECT TRS#01 Tray #041, Adis,Erwin,Montgomery et.al. collectors" / "Histeridae sp.#2" / "Caterino/Tishechkin Exosternini Voucher EXO-00478" (USNM).

Diagnostic description.

Length: 2.7mm, width: 2.2mm; body elongate, weakly subquadrate, elytral sides weakly rounded, pronotum narrower, sides convergent, moderately depressed, most surfaces conspicuously, but not too deeply or densely punctate, with very short, inconspicuous, fine pubescence on at least pygidia and pronotum (probably more conspicuous on most of dorsum in fresh specimens); head, pronotum, and pygidia rufopiceous, shining, with very faint metallic tinge, elytra dully metallic blue, venter rufobrunneus; frons with fine anterior transverse carina, deeply depressed above and on epistoma below; frons with distinct alutaceous microsculpture, otherwise densely but very shallowly punctate, frontal stria apparent along eyes, obscured by punctures across middle; labrum about 4 ×wider than long, apical margin distinctly emarginate; each mandible with strong, acute median tooth; antennal scape rather elongate, curved, expanded apically, truncate, club small, oval, basal two-thirds mostly glabrous; pronotal sides more or less straight, weakly convergent in basal three-fourths, subangulate to apices, marginal stria complete along lateral and anterior margins, somewhat obscured by dense punctation; lateral submarginal pronotal stria present along sides, deeply impressed, merging with marginal stria near anterior corner, marginal bead narrowly, strongly convex, punctatorugose; pronotal discal punctation dense throughout; elytra with single complete, broadly impressed epipleural stria, outer subhumeral stria present in basal half, inner subhumeral stria present in basal two-thirds, dorsal striae 1-3 complete, 4th and 5th striae barely indicated by basal strioles, sutural stria weakly impressed but present in most of apical three-fourths, elytral punctation dense throughout, becoming weakly subrugose near apices of 1 st– 3rd dorsal striae; prosternum narrow basally, flat, keel narrowly, weakly emarginate at base, carinal striae subparallel in basal third, weakly diverging anterad; prosternal lobe about one-half keel length, apical margin distinctly emarginate, strongly deflexed, marginal stria obsolete; mesoventrite with anterior margin very weakly produced, marginal stria complete, mesometaventral stria weak, present at sides, interrupted medially; lateral metaventral stria extending posterolaterad toward middle of metacoxa, outer lateral stria absent, metaventral disk sparsely, finely punctate medially; abdominal ventrite 1 with single lateral stria abbreviated apically, middle portion of disk punctate as metaventrite; all tibiae rather elongate, narrow, protibia bluntly, weakly tridentate, outer margin very weakly serrulate; mesotibia with two weak marginal spines; outer metatibial margin with single fine, subapical marginal spine; propygidium without basal stria, densely punctate, individual punctures microsculptured within; propygidial gland openings conspicuous, very close to basal corners; pygidial punctation similar to that of propygidium, punctures somewhat finer around all edges, larger in middle of disk. Male genitalia (Fig. 67): T8 slightly wider than long, basal emargination shallow, sides rounded, converging apically, apical emargination narrow, ventrolateral apodemes well sclerotized, nearly meeting at ventral midline; S8 halves rather narrow, approximate at bases, diverging and curving upward apically, apices bluntly rounded; T9 with long, thick proximal apodemes about one-half entire length, apices narrowly rounded, convergent, ventrolateral apodemes short, recurving proximad, subacute; T10 very weakly sclerotized; S9 stem widely rounded toward base, apical arms divergent, obliquely subquadrate, apical emargination shallow, desclerotized along midline; tegmen narrow, long, sides subparallel more or less throughout, weakly curved ventrad in apical third; median lobe about one-third tegmen length; basal piece about one-third tegmen length.

Remarks.

This species is very distinctive, with metallic coloration only on the elytra (Fig. 66A), conspicuous punctation throughout, its transverse frontal carina di viding a deeply depressed frons and epistoma (Fig. 66C), the deeply impressed lateral submarginal pronotal stria, and elongate legs (Fig. 66B).

Etymology.

This species’ name refers to its elongate femora and tibiae.