Cionus latefasciatus Voss, 1956

Košťál, Michael & Caldara, Roberto, 2019, Revision of Palaearctic species of the genus Cionus Clairville (Coleoptera: Curculionidae: Cionini), Zootaxa 4631 (1), pp. 1-144 : 100-101

60. Cionus latefasciatus Voss, 1956

Figs 60 a–f.

Cionus latefasciatus Voss, 1956: 15 . Caldara, 2013: 123. Alonso-Zarazaga et al., 2017: 185.

Type locality. Mt. Tsurugi ( Japan, Shikoku , Tokushima) .

Type series. In coll. Voss ( ZMUH), there are a couple of pinned specimens fully corresponding morphologically and by labeling to the original description. We dissected and remounted a slightly damaged (missing right medial and posterior leg and left pro- and mesotarsus), 3.72 mm long male labeled “Japan, Shikoku Mt. Tsurugisan Tokushima-ken / 28.VII.1949 coll. M. Chujô / [illegible Japanese, folded] / Mt. Tsurugi-san Tokushima-ken Shikoku, JAPAN 28.VII.1949 Coll. M.-T. CHŰJÔ [folded] / Holotypus Cionus latefas-ciatus m. [red label]”.This specimen is indicated in the original description as “Typus!” and should be regarded as the holotype . The other specimen, a female labeled “Japan, Shikoku Mt. Tsurugi-san / Tokushima Pref. / 25.VII.1954 coll. M. Chujô / Mt. Tsurugi-san Tokushima Pref. Shikoku, JAPAN 25.VII.1954 Coll. M. CHÛJÔ[folded] / Paratypoid Cionus late-fas- ciatus m. [red label]” is regarded as a paratype .

Synonyms. None.

Redescription. Male. Body stout, subglobose. Head: rostrum moderately stout, medium long (l/ w 4.2, Rl/Pl 1.60), black; in lateral view markedly evenly curved with slight angle along upper-margin at antennal insertion, of same width from base to apex; in dorsal view slightly broadened from base to apex, in basal part round in cross-section, in apical part moderately dorsoventrally flattened; densely longitudinally punctured, feebly carinated at antennal insertion, with smooth medial area at apex; in basal part with up- and backwardly oriented, recumbent, whitish and dark brown scales, in apical part with subrecumbent, forwardly oriented, relatively short seta-like scales. Head between eyes narrow, of less than 0.5 of rostrum width at base. Eyes large, flat.Antennae brown with darkened club, inserted beyond 2/3 of rostrum length; funicle of 0.6 scape length, segment 1 wider than segment 2, segments 1 and 2 twice as long as wide, segments 3–5 as long as wide, subglobose; club spindle-shaped, twice as long as wide, completely covered with recumbent pale hairs and sparse, erect whitish sensilla. Pronotum: black, wider than long (Pw/Pl 0.63), sparsely, very finely punctured, punctures subrotund, unevenly densely distributed, spaces between punctures larger than puncture diameter; on disc sparsely, on sides densely covered with recumbent, elongate (w/l 6–8) whitish scales; widest at base, in basal part moderately narrowed, in anterior part slightly abruptly, more conically narrowed to anterior margin, with shallow wide constriction, in lateral view in basal part flat, then gradually rounded and falling to anterior margin. Prosternum: anterior margin with semicircular deep emargination bounded by sharp edges, from coxae separated by very narrow prosternal area. Scutellum: triangular, covered with narrow whitish scales, punctured. Elytra: black, in basal 2/3 moderately rounded, in apical 1/3 broadly evenly rounded, subglobose, short (El/Ew 1.06), widest at about half of their length, at base somewhat wider than pronotum (Ew/Pw 1.67), humeri subrotund, prominent, with posthumeral impression; convex on disc; interstria 1 at about 1/3 of medial length moderately, in preapical area indistinctly broadened, interstria 2 at same lengths on dorsum moderately, in preapical area indistinctly narrowed and constricted laterally encompassing longitudinally oval dorsal and irregular preapical black tomentous maculae without differently colored scale border; interstriae except perimacular areas of approximately equal width, in middle of elytral length odd interstriae wider than even ones, interstria 3, 5 and 7 in posterior half slightly vaulted; odd interstriae except white scaled parts with alternating black and whitish, unevenly distributed patches of scales; striae shallow, formed by irregular single rows of medium large, deep, semidensely arranged punctures; anterior and posterior third with broad white bands formed by densely arranged, recumbent, elongate (l/w 4–6) white scales, anterior white band on interstriae 1–2 emarginate, posterior band projecting anteriorly, transverse medial part on odd interstriae with alternating patches of black and white scales, even interstriae covered with recumbent elongate brown scales, elytral integument on white bands and odd interstriae completely, in medial part of elytra on even interstriae almost completely concealed. Venter: metepisterna and lateral parts of metasternum densely, median longitudinal part and ventrites sparsely covered with recumbent elongate whitish scales, mesosternal process flat, broad, with almost straightly truncated posterior margin, scaled, punctured; metasternum slightly concave, semidensely punctured; ventrite 1 with very shallow impression, ventrite 2 flat, both punctured; ventrite 1 1.6 × as long as ventrite 2, ventrites 1–2 combined 4.3 × as long as ventrites 3–4 combined, ventrites 3–4 combined slightly shorter than ventrite 5. Legs: femora blackish, tibiae and tarsi dark brown, all femora, especially meso- and metafemora, with large subtriangular sharp teeth; femora covered with unevenly distributed, recumbent to subrecumbent, whitish and sparse brownish elongate scales forming three well visible transverse white bands, tibiae covered with subrecumbent whitish and sparse brownish scales, tarsomeres 1–3 with suberect, onychia with subrecumbent whitish seta-like scales and hairs, tarsomere 3 wider than long; protarsal claws of approximately equal length, connate almost in their entire length, meso- and metatarsal medial claws shorter than their pair-claws. Penis: Figs 60 d–f, its body medium long, with subparallel sides, slightly sinuate and tapered at apex.

Female. Rostrum slightly longer (Rl/Pl 1.62). Ventrites 1 and 2 without impression, convex. Claws equally long.

Variability. Length ♂♂ 3.53–3.99 mm, ♀♀ 3.76–3. 85 mm. The few specimens examined do not show consid- erable differences.

Diagnosis. Cionus latefasciatus is characterised by two broad transverse, irregularly delimited bands of white scales in anterior and posterior third of elytra.

Comparative notes. This species is rather peculiar among the Palaearctic Cionus . In eastern provinces of China, a slightly different form occurs, which highly probably falls into the variability range, similarly as in C. tamazo . At the first look, C. latefasciatus can be confused with Stereonychus hemileucus Wingelmüller, 1915 , which differs by the main generic character, namely one tarsal claw on all legs in both sexes and, moreover, larger size and different elytral pattern only seemingly similar to C. latefasciatus .

Biological notes. Biology unknown.

Distribution. Japan, China, according to Legalov & Sergeev (2018) newly found in the Far East of the Russian Federation (Primorsky Krai, Furugelm Island).

Non-type specimens examined. China: Zhejiang, Jinhua , 3. v. 2005, 360 m, 3 ♂♂, 1 ♀ ( IZCAS) .

Figures

FIGURES 59–60. FIGURE 59. Cionus griseus. a: body in dorsal view (male), b: body in lateral view (male), c: rostrum in lateral view (female), d: penis in ventral view, e: penis in lateral view, f: apex of penis in dorsal view. Not to scale. FIGURE 60. Cionus latefasciatus. a: body in dorsal view (male), b: body in lateral view (male), c: rostrum in lateral view (female), d: penis in ventral view, e: penis in lateral view, f: apex of penis in dorsal view. Not to scale.