Abstract
Engytatushenryisp. n. is described from the Waianae Mountains of Oahu. This new species feeds on Abutilonsandwicense (Malvaceae), an endangered understory plant in mesic forests. A dorsal habitus photograph and line drawings of key male genitalic structures are provided for E.henryi, accompanied by a photograph of the host plant. Cyrtopeltiskahakai Asquith is given a new generic assignment as Engytatuskahakai (Asquith) new combination, and additional locality and host-plant records are provided for four other Hawaiian endemic Engytatus species.
Highlights
The genus Engytatus is represented by 28 species worldwide, and has undergone a modest insular radiation in the Hawaiian Islands, where 9 endemic species have been previously known to occur, most of them single-island endemics (Perkins 1912, Carvalho and Usinger 1960, Gagné 1968, Asquith 1992)
The Hawaiian species currently held in Engytatus were all originally described in the genus Cyrtopeltis (Perkins 1912, Carvalho and Usinger 1960, Gagné 1968), within which Engytatus was considered a subgenus by most authors
All Hawaiian species formerly assigned to Cyrtopeltis are considered to fall within the generic limits of Engytatus as it is currently interpreted
Summary
The genus Engytatus is represented by 28 species worldwide, and has undergone a modest insular radiation in the Hawaiian Islands, where 9 endemic species have been previously known to occur, most of them single-island endemics (Perkins 1912, Carvalho and Usinger 1960, Gagné 1968, Asquith 1992) These species occur on host-plant species in the genus Cyrtandra in the Gesneriaceae; Dubautia in the Asteraceae; Lysmachia in the Primulaceae; Phyllostegia in the Labiatae; Scaevola in the Goodeniaceae; and Sida in the Malvaceae. Mountains of Oahu, the author discovered yet another new species in this insular assemblage, present on Abutilon sandwicense, another host plant in the Malvaceae This new species is described below, and additional geographic and host-plant records are provided for four other native Hawaiian Engytatus species. It is shown that individual Engytatus species utilize multiple host species in the genus Cyrtandra on Oahu, and multiple species of Dubautia on Maui, indicating that species isolating mechanisms operate primarily at the host-plant genus level in Hawaiian Engytatus
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