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The genus    Arctesthes    Meyrick (  Geometridae  :   Larentiinae  :   Xanthorhoini  ), endemic to the South Island of New Zealand, is revised. Four species are recognised, including two new species, as follows:    Arctesthes   catapyrrha    (Butler, 1877),    A.   siris    (Hudson, 1908),    A.   titanica    sp. nov.  and    A.   avatar    sp. nov.  All except    A.   catapyrrha    are restricted to subalpine and alpine localities. Adults and genitalia are fully described and illustrated for all species; larvae of    A.   catapyrrha    are also briefly described and illustrated. Only    Arctesthes   catapyrrha    is widespread;    A.   siris    is restricted to a few mountain ranges of Central Otago;    A.   titanica    is only known from two wetland localities in the Von Valley of the Otago Lakes district, and    A.   avatar    is only known from a few wetlands in a restricted area of north-west Nelson. The two new species are considered of very high priority for conservation.

alpine entomology

Review of the endemic New Zealand genus    Arctesthes    Meyrick (  Lepidoptera  ,   Geometridae  ,   Larentiinae  ), with descriptions of two new range-restricted species