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A new genus and species of Mesostylini Reitter, 1913 (Coleoptera: Curculionidae)

Is described the new genus Viridistylus n. gen. and its type species Viridistylus robustus n. sp. from Tajikistan belonging to the entimine tribe Mesostylini. A key to the genera of Mesostylini thus far known, and illustration of the new species are included.


Introduction
The tribe Mesostylini Reitter, 1913 is comprised of five Palaearctic genera of Entiminae Schoenherr, 1823, four of which are distributed in central Asia, and another in the United Arab Emirates Alonso-Zarazaga et al. 2017). They are peculiar due to their mandibular process at the apical outer sides of rostrum. This note deals with the description of a new genus and species from Tajikistan. Labels of specimens are quoted as written, a slash separates lines of a label.

Diagnosis.
A genus impossible to confuse with the hitherto described ones by the combination of projecting humeri, clothing of dense green scales, thin antenna, and large size.
Description. Quite large (body length without rostrum: ca. 6.3-6.9 mm). Integument brown. Entire body, mandibular processes, epistoma and claws excepted, densely clothed with roundish green scales which became subpolygonal and nacreous on knees, tibiae and tarsi. A fringe of creamy seta-like scales on anterior and posterior margin of pronotum. Epistoma small, triangular, its posterior margin not reaching the level of antennal insertion. Rostrum quite elongate and slightly narrowing towards apex. Mandibular process almost straight and forming an angle of about 30° with the sides of rostrum. Scrobe pit-shaped with in-ner antero-lateral margin sinuate, barely projecting from lateral margin of rostrum. Epifrons sulcate along middle and with a minute spine-like tubercle at apex above antennal insertion. Scape thin, almost straight and quite abruptly clubbed, funiculus just a little narrower than scape, club fusiform, well separate from segment 7 of funiculus. Head much wider than long, interocular distance about twice as epifrons at the level of antennal insertion, and three times as the maximum eye width. Eyes slightly oval, projecting from head convexity. Pronotum subconically narrowing towards apex, base almost straight. Elytra parallel-sided for 2/3 of their length, humeri protruding. Scutellum large, semicircular. Striae in the form of narrow black minutely punctate lines, intervals barely convex and more than 5 times wider than striae. Femora edentate. Tibiae quite flat, hardly bisinuose and dilated outwards and inwards. Claws free.
Etymology. The green colour of the scales suggested the masculine name of this genus, by combining the Latin viridis (green) to Mesostylus. be confused with the single one of Viridistylus for all of them are greyish with or without spots, and have thick antennae with segment 7 quite indistinct from club or almost so (Arnol'di 1960;Bajtenov 1974).

Remarks
The following key, modifying those by Arnol'di (1960), Bajtenov (1974) and , can be used to separate the thus far known genera of Mesostylini: Description. Holotype (Fig. 1). Length (without rostrum) 6.5 mm. Rostrum sligthly narrower at apex than at base and almost as long as wide. First funicular segment twice as long as wide, second 1.5 as long as wide, 3-7 transverse, clearly separate from each other and slightly diminishing in length, club fusiform and elongate, about as long as the 3 last funicular segments. Head very short, frons with a small fovea almost invisible due to the scale covering. Pronotum 1.36 wider than long, subconical. Elytra 1.40 longer than wide and 2.90 as long as pronotum, quite strongly convex. First tarsal segment some 2.5 times longer than wide, second about as long as one-half of the first, third a little wider and shorter than the second, deeply bilobed to accommodate onychium which is a little shorter that the preceding 3 tarsomeres. See also Fig. 1.
Etymology. The Latin name, meaning 'corpulent' refers to the large size and portly shape of the new species.