Baconia pernix, 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: 39-40

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scientific name

Baconia pernix

sp. n.

Baconia pernix   sp. n. Figs 6D8 C–F, H–IMap 1

Type locality.

PANAMA: Canal Zone: Paraiso [9.03°N, 79.62°W]

Type material.

Holotype male: "Paraiso CZ Pan Feb 9.11 EASchwarz" / "ex. Colln. USNM" / "FMNH-INS 0000 069 303" (FMNH). Paratype (1): PANAMA: Colón: 2 km S Sabanitas, 9°19'19"N, 79°47'54"W, 120 m, 15-19.vii.1999, A. Gillogly & J.B. Woolley (TAMU).

Diagnostic description.

Length: 1.8-2.0mm, width: 1.5-1.7mm; body broadly elongate, strongly depressed, glabrous; head and pronotum metallic greenish-blue, contrasting slightly with metallic blue elytra and pygidia, venter rufo-brunneus; frons weakly convex over antennal bases, shallowly depressed along midline, ground punctation fine, few coarse punctures at middle of frontal disk and toward vertex, frontal stria present along inner margin of eye, curving inward at front, interrupted over antennal bases and at middle, supraorbital stria absent; antennal scape short, club oblong; epistoma weakly emarginate apically; labrum about 3 ×wider than long, weakly bisinuate apically; both mandibles with small basal tooth; pronotal sides subparallel basally, increasingly arcuate to apex, marginal stria complete along lateral and anterior margins, lateral submarginal stria absent, pronotal disk narrowly depressed in anterior corners, ground punctation of pronotal disk fine, inconspicuous at middle, slightly coarser secondary punctures present in lateral fourths; elytra with two complete epipleural striae, outer subhumeral stria absent, inner subhumeral stria present at base, dorsal striae 1-3 complete, 4th stria present in apical fourth, 5th stria longer, present in most of apical half, sutural stria shorter, may be absent, elytral disk with few coarse punctures in apical fifth; prosternum broad, weakly convex, keel outwardly arcuate at base, carinal striae well separated, complete, subparallel anterad; prosternal lobe about two-thirds keel length, apical margin broadly rounded, marginal stria obsolete at sides; mesoventrite broadly, shallowly emarginate at middle, marginal stria broadly interrupted; mesometaventral stria anteriorly arcuate, sinuate at middle, crenulate, narrowly detached at sides, inner lateral metaventral stria extending from inner corner of mesocoxa posterolaterad toward outer third of metacoxa, slightly abbreviated apically, outer lateral metaventral stria absent, metaventral disk impunctate at middle; abdominal ventrite 1 with single, complete lateral stria, middle portion of disk lacking coarse punctures; protibia narrow, 4-dentate, outer margin serrulate between teeth; mesotibia with single marginal spine, outer metatibial margin smooth; propygidium with complete transverse basal stria, discal punctures small, ocellate, separated by 1 –2× their diameters; propygidial gland openings inconspicuous; pygidium with ground punctation moderately dense, secondary punctation increasingly evident toward base. Male genitalia (Figs 8 C–F, H–I): T8 slightly longer than broad, sides subparallel, basal emargination broad, deep, apical emargination small, narrow, with ventrolateral apodemes short, separated by about two-thirds maximum T8 width, extending about midway distad beneath, obsolete in apical half; S8 divided, inner margins subparallel in basal one-third, evenly divergent to apices, outer margins weakly divergent, apical guides well developed in apical half, broadly rounded apically; T9 with basal apodemes thin, about half total length, T9 apices narrow, acute, weakly opposed, glabrous, ventrolateral apodemes very weakly projecting beneath; S9 weakly widened at base, head only slightly widened, with apicolateral points curved, horn-like, desclerotized along midline, with narrow apicomedial division; tegmen with sides weakly widened to apex, undulating slightly, apex broadly rounded, dorsobasal edge weakly arcuate, tegmen more or less straight in lateral aspect; median lobe about two-thirds tegmen length; basal piece about one-fourth tegmen length.


This species can be distinguished from the close relatives above by the short but distinctly impressed 4th and 5th elytral striae (Fig. 6D), with the 5th extending further anterad than the 4th. It is very similar to Baconia furtiva   , above, but in that species these striae are little more than apical series of punctures. The lateral pronotal punctures of Baconia pernix   are also shallower and sparser.


This species name means ‘active’.