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The mature larva of    Cionus   olivieri    Rosenschoeld, 1838 is described and illustrated in detail for the first time. It is compared with those known from the same genus and other genera in the tribe   Cionini   and with those of the hypothesized sister tribe   Mecinini   in the   Curculioninae  . The larvae of    Cionus    have three distinctive diagnostic features: the reduced number of setae on the epicranium (only two or three   des   and one or two   fs  ) and on the epipharyngeal lining (only two   als  , two   ams  , and no  mes ); i.e., distinctly fewer than the most frequent number of setae in weevils, and mandibles dentate or angulate internally near the base. If considered together with    Stereonychus    Suffrian, 1854, the other genus of   Cionini   with larvae studied in detail, it is preliminarily suggested that mature larvae of this tribe might be characterized by six main diagnostic features: (1) labial palpi one-segmented, (2) labral rods absent, (3) pedal areas swollen to form large lobes or prolegs, (4) mandible with sharp apical teeth, (5) reduced number of   fs   on frons, only one or two   fs  , and (6) reduced number of epipharyngeal setae (two or three   als   and two or three   ams  , but no  mes ). It was noticed that    C.   helleri    Reitter, 1904 from Japan, a very distinct species in the genus for some characters of the adult, also possesses distinctive characters in the larva which are uncommon among known cionines. New biological data on    C.   olivieri    with the discovery of its host plant,    Verbascum   songaricum    (  Scrophulariaceae  ), in central Asia are also reported.

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Description and biological notes of the larva of    Cionus   olivieri    Rosenschoeld, 1838 (  Coleoptera  ,   Curculionidae  ), with a comparison with other species of the tribe   Cionini