New taxa of the weevils of the tribe Blosyrini (Coleoptera: Curculionidae: Entiminae) from the Sino-Tibetan Mountains

A new weevil genus Igorius Davidian, gen. n. (Entiminae: Blosyrini) is described from the south-western part of Sichuan Province in China. It is characterized in the following features: rostrum subquadrate; pronotum widest between of the middle and preapical third, clearly compressed laterally in basal half, on disc with numerous granules and narrow median carina; 5th elytral interstriae in preapical part strongly keeled with tubercle at the end almost obliquely descending to the apical declivity, distinctly protruding beyond the apical margin of elytra. Apical margin of elytra between protruding fifth interstriaes, straight or slightly bisinuate. Four new species including I. pictus sp. n. (type species), I. elegans sp. n., I. pastoralis sp. n. and I. tristis sp. n. are described and provided with a key. Male of I. pictus sp. n. easily differs from other in the following features: inside margin of fore tibiae in the middle part is strongly flattened and bent dorsally, endofallus armament with distinct pair of endophallic rods, which are somewhat shorter, than pair of anterior sclerites. Igorius elegans sp. n. is the most similar to I. pictus sp. n., its fore tibiae are without a flattened extension in the middle part and pair of endophallic rods barely marked. Igorius pastoralis sp. n. is characterized in fore tibiae strongly curved in apical half, on the inner side basal to middle angularly widened, pair of anterior sclerites longer than penis, almost reaching apex, very narrow in apical half, at base with distinct pair clusters of spinules. Igorius tristis sp. n. differs in having a wider body, the width of the elytral base is much narrower than the distance between tubercles at the apical elytral margin