A new species of the genus Otiorhynchus Germar, 1822 (Coleoptera: Curculionidae) from South-eastern Altai

A new species, Otiorhynchus ( Mongolorrhynchus ) altaipilosus Legalov, sp. nov. from South-eastern Russian Altai of Western Siberia is described and illustrated. This species is similar to O. populiger Arnoldi, 1975 from Bayankhongor Province but differs from it in small teeth on the femora, the length of the rostrum is subequal to its width at the base, wider elytra, and the rugose-punctate pronotum. A distribution map for O . altaipilosus Legalov, sp. nov. and O. populiger is given.


Introduction
The fauna of South-eastern Altai differs from the faunas of other regions of this mountain system. This fauna is closest to the Mongolian and Tuvan faunas. The representatives of the family Curculionidae are one of the main inhabitants of these steppes. Seven species are endemic to South-eastern Altai. The species from the genera Stephanocleonus Motschulsky, 1860 and Otiorhynchus Germar, 1822, and Phyllobius femoralis Boheman, 1842 are numerous in this region. Twelve species of the genus Otiorhynchus were known from South-eastern Altai (Arnoldi 1975;Legalov 2020bLegalov , 2020cLegalov , 2021aLegalov , 2021b. Two species, Otiorhynchus (Osmobodes) beatus Faust, 1890 Otiorhynchus (Holomrasus) sushkini L. Arnoldi, 1975 are dominant, but other species of this genus are rarer.
In this paper, the new species of the subgenus Mongolorrhynchus Arnoldi, 1975 from the genus Otiorhynchus close to the species from Ikh-Bogd (Mongolian Altai, Bayankhongor Province) of Mongolia is described and illustrated.

Material and methods
Type specimens are kept in the ISEA -Institute of Systematics and Ecology of Animals (Russia: Novosibirsk).
Descriptions, photographs and body measuring of the new species were performed using a Zeiss Stemi 2000-C dissecting stereomicroscope.
The terminology of weevil body is according to Lawrence et al. (2010). The systematics of studied taxa are based on Alonso-Zarazaga et al. (2017) and Legalov (2020aLegalov ( , 2021. Description. Female: Body black, covered with semierect long yellowish setae. Antennae and legs redbrown. Rostrum short, almost straight, with distinct middle carina, coarsely punctate, 0.8-0.9 times as long as wide at apex, 0.9-1.2 times as long as wide in middle and 0.9-1.0 times as long as wide at base, 0.4 times as long as pronotum. Mandibles massive, with scar of deciduous process. Antennal scrobes located dorsally in first half of rostrum. Maxillae covered by large prementum. Forehead flattened, 0.7-0.9 times as narrow as rostrum base width, coarsely punctate. Eyes large, coarsely faceted, suboval, weakly convex, protruding from contour of head. Temples quite short. Antennae inserted subapically, long. Scapus long, weakly curved, about 8.6 times as long as wide at apex, not reaching middle of pronotum. Antennomeres 2 and 3 longconical, equal in width. Antennomere 2 about 2.2 times as long as wide, about 0.2 times as long as and 0.9 times as narrow as antennomere 1. Antennomere 3 about 1.7 times as long as wide, 0.8 times as long as antennomere 2. Antennomeres 4 and 5 subconical, equal in width. Antennomere 4 1.4 times as long as wide, 0.7 times as long as and about 0.8 times as narrow as antennomere 3. Antennomere 5 1.2 times as long as wide, about 0.9 times as long as antennomere 4. Antennomeres 6 and 7 rounded, equal in width. Antennomere 6 about 0.7 times as long as wide, 0.5 times as long as and 0.9 times as wide as antennomere 6. Antennomere 7 equal in length and width, about 1.7 times as long as wide, about 1.1 times as long as antennomere 6. Antennomeres 7 and 8 equal in width.

Differential diagnosis.
The new species is similar to O. populiger from Bayankhongor Province but differs from it in small teeth on the femora, the length of the rostrum is subequal to its width at the base, wider elytra, and the rugose-punctate pronotum.
Etymology. From Altai locality and the Latin pilosus (hairy).