Bulasconotus scaccarius, Bernard & Gillett, 2020

Bernard, Jared & Gillett, Conrad P. D. T., 2020, A new species of cylindrical bark beetle (Zopheridae: Colydiinae) from Vanuatu establishes in Hawaii, Zootaxa 4809 (3), pp. 593-599 : 594-598

Bulasconotus scaccarius sp. nov.

urn:lsid:zoobank.org:act:645EB9AB-54A5-4186-9C76-EC8982AD263C

Holotype: Vanuatu (labelled as New Hebrides): 1, NW Efate Island , N of Maat, 19.viii.1957, coll. J.L. Gressitt, 100 m, limestone plateau ( BPBM).

Paratypes: Vanuatu (labelled as New Hebrides ): 45, Epi Island, Vaemali, 6–10.viii.1967 , colls J. & M. Sedlacek, 100–150 m (43, BPBM; 1, UHIM; 1, USNM); 1 , same data as previous, 16–21.viii.1967 ; 1, same data as previous, 10.viii. 1967, 150 m; 43, same data as previous, 11–18.viii.1967 , 80– 150 m (42, BPBM; 1, MHNG); 9, Malekula Island , Lamap, 8–21.ix.1967 , colls J. & M. Sedlacek (8, BPBM; 1, BMNH); 2 , same data as previous, 18–21.ix.1967 ; 5, same data as previous, 19–21.ix.1967 ; 1, same data as previous, 8–21.ix.1970 ; 38, Malekula Island , N Lakatoro, 22–30.ix.1967 , colls J. & M. Sedlacek ( BPBM); 1, Malekula Island , Lakatoro, 23.ix.1967 , colls J. & M. Sedlacek ( BPBM); 1 , same data as previous, 23.ix–19.x.1967 ; 6, same data as previous, 29.ix.1967 ; 3, N Malekula Island , 15 km NW of Norsup, 28.ix.1967, coll. J. Sedlacek ( BPBM) ; 7, Santo Island , Big Bay, E Jordan River, 16.ix.1979, coll. W.C. Gagne , 5 m, under bark of dead trees ( BPBM, Accession 1979.380) .

Other material examined: Hawaii: 1, Oahu Island, N Waianae Mtns, Kahanahaiki Valley , 8.v.2009, coll. P. Krushelnycky, 600 m, pitfall trap (P. Krushelnycky #AR0569, PKSP8323 , loaned to BPBM); 2, Oahu Island, Ahupuaa O Kahana SP (21°33.41’ N, 157°52.67’ W), 25.vi.2019, coll. D. Honsberger, ex. Hibiscus tiliaceus , 10–20 m ( UHIM) ; 3, same data as previous, 20.viii.2019; 3, Oahu Island, Koolau Mtns, Waahila Ridge , 4.x.2019, coll. D. Honsberger, ex. Acacia koa ( UHIM) ; 1, Oahu Island, Koolau Mtns, Mt Tantalus , x.2019, coll. D. Honsberger, ex. Cheirodendron ( UHIM) ; 8, Oahu Island , Waianae Mtns, Honouliuli FR, Kaluaa Gulch (21°27.64’ N, 158°6.00’ W), 29.x.2019, coll. J. Bernard, ex. Planchonella sandwicensis , c. 650 m (2, BPBM; 2 pinned, 2 in 95% EtOH, UHIM; 2, HDOA); 7, same data as previous, coll. C.P.D. T. Gillett (2 pinned, 2 in 95% EtOH, UHIM; 2, MGCB; 1, MHNG); 9, same data as previous, coll. D. Honsberger (5, UHIM; 2, BPBM; 2, HDOA) .

Diagnosis. Bulasconotus scaccarius sp. nov. has a chequered pattern on the elytra and redoubled medial carinae on the pronotal disc, whereas B. solomon has a uniformly brown body and medial pronotal carinae that are not redoubled ( Ślipiński & Lawrence 1997).

Description. n = 164. Length from anterior pronotal margin to elytral apex 3.11–3.92 mm, 2.65–2.85× longer than wide; testaceous orange to ferruginous red body with black markings on elytra ( Fig. 2A ); testaceous orange-red legs with pro-, meso-, and meta-tarsi clearly four-segmented (i.e., formula, 4-4-4) ( Fig. 2B ).

Head: 0.66–0.79 mm long, 1.14–1.16× wider than long, widest at eyes ( Fig. 2 ); fuscous orange-red; vertexfrons-clypeus region continuous and with no canthal folds between frons and clypeal margins at eye, integument slightly rugose, slightly convex medially, uniformly and densely covered in minute translucent setae; clypeus with lateral margins rounded and somewhat raised, medial anterior margin with shallow indentation ~ 0.03 mm deep and 0.20 mm wide; compound eyes black, large, and spherical, occupying nearly half the length of the head visible dorsally (0.29–0.35 mm), lacking supraorbital carinae, long slender antennal grooves ventrally; antennae 11-segmented with long translucent setae (0.03–0.04 mm) emerging from distal margin of each segment, antennomere III length subequal to that of following two segments combined, distal three segments forming a loose club, with antennomere IX subtrapezoidal, antennomere X transverse, and antennomere XI rounded ( Fig. 3A ).

Pronotum: 0.84–1.10 mm long, 1.21–1.31× wider than long, slightly rugose ( Fig. 3B ), uniformly but sparsely covered in minute translucent setae; fuscous orange-red with indistinct nearly black mark covering posterior twothirds of pronotal disc aside from dull orange area at medial posterior margin, sometimes with brighter orange lat- eral margins; lateral margins convexly bowed and finely crenulate, separated from pronotal disc by lateral explanate regions 0.17–0.22 mm wide, each anterolateral margin extending ~ 0.10 mm anterior of pronotal disc anterior margin to form nearly equilateral triangular projection; pronotal disc somewhat convex but sculpted by 2 pairs of longitudinal carinae, between which form shallow troughs; outer lateral carinae slightly curved, roughly parallel to lateral pronotal margins; inner medial carinae diverging posteriorly, each bifurcating at posterior third to form faint almond-shaped loop extending to posterior margin; both lateral and medial carinae merge with convexly rounded anterior margin, and both pairs of carinae crested with row of minute translucent recumbent setae; raised rounded edge at base of pronotum.

Scutellum: 0.05–0.06 mm wide minute square; fuscous orange-red.

Elytra: 2.09–2.86 mm long, 1.93–1.95× longer than width of combined elytra, anterior half more or less parallel sided, posterior half gradually tapered to rounded apex ( Fig. 2A ); testaceous orange to ferruginous red with 5 more or less distinct rectangular–trapezoidal black marks arranged in a chequered grid, each mark ~ 0.30 mm wide and 0.49–0.62 mm long; obscure black mark at each lateral margin more or less aligned with grid; medial black oval or triangular mark posterior to grid and extending to elytral apex; strong longitudinal carinae extend length of interstriae I, III, V, VII, and IX, each somewhat crenulate anteriorly, each crested with more or less continuous row of short recumbent translucent setae, anterior part of carina on interstria I demarcates scutellary striole; strial punctures large, 0.03–0.05 mm diameter, each bearing a recurved translucent yellowish seta 0.04–0.06 mm long.

Venter: testaceous orange-red, prosternum fuscous with more or less distinct dark rufous or black mark covering prosternal episterna but not usually extending to prothoracic margins that are testaceous orange, ventrites I–II somewhat ferruginous ( Fig. 2B ); venter sparsely but uniformly covered in fine translucent setae; procoxal cavities broadly open externally ( Fig. 3C ); acuminate medial intercoxal process of ventrite I; ventrite V with scalloped transverse groove parallel to apex. Aedeagus ~ 0.85 mm long with both parameres and apodemes unfused ( Fig. 3D ).

Etymology. The specific epithet is the adjective form of the nominative singular noun scaccarium, meaning a chessboard, in reference to the chequered pattern on the elytra. This name thereby conforms to article 11.9.1.1 of the International Code of Zoological Nomenclature. Because the adjective suffix agrees with the masculinity of the generic name, the binomial name also conforms to article 31.2 even though the eponym is neuter.

Distribution. Vanuatu archipelago; Oahu (Hawaiian Islands)

Figures

FIGURE 2. Micrograph of Bulasconotus scaccarius sp. nov. collected by Josef and Marie Sedlacek on Vanuatu’s Malekula Island in 1967, depicting coloration of A) dorsal and B) ventral aspects. Scale bars: 1 mm.

FIGURE 3. Bulasconotus scaccarius sp. nov. A) antenna, scale bar: 0.25 mm; B) pronotum, scale bar: 0.5 mm; C) ventral prothorax, scale bar: 0.5 mm; D) dorsal aedeagus, scale bar: 0.5 mm.