A new species of the genus Auletobius Desbrochers des Loges, 1869 (Coleoptera: Rhynchitidae) from Indonesia

Auletobius (Auletobius) siberutensis sp. n. is described and illustrated from Siberut Is. (Indonesia: Mentawai Islands). The new species is close to A. fumigatus (Roelofs, 1874) from East Asia but differs in the thinner and smooth rostrum, narrower pronotum, extended basally basal sclerite of the endophallus, and smaller body sizes. It is similar to A. acaciae Voss, 1935 from Java, but is distinguished in the longer (considerably longer than head) narrow rostrum, narrow pronotum, wider elytra and narrowed to the apex basal sclerite of the endophallus. From A. sumatranensis Legalov, 2007 from Sumatra, new species is differs in the dark body with yellow procoxae, profemora and protibiae, a rather narrow pronotum, sparse punctate forehead and body covered with sparse hairs. A key to species of the genus Auletobius from Sunda Islands and neighboring regions is given.