Apterocyclus waterhousei Sharp, 1908

Paulsen, M. J. & Hawks, David C., 2014, A review of the primary types of the Hawaiian stag beetle genus Apterocyclus Waterhouse (Coleoptera, Lucanidae, Lucaninae), with the description of a new species, ZooKeys 433, pp. 77-88 : 83-84

Taxon classification Animalia Coleoptera Lucanidae

Apterocyclus waterhousei Sharp, 1908 Figs 8, 16, 21

Apterocyclus waterhousei Sharp in Sharp and Scott 1908: 403. Type material: Holotype male (NHM) labeled: a) handwritten, on cork "Apterocyclus waterhousei / Type D.S./ Kauai, Perkins"; b) "Sandwich Is. / 1912 –215”; c) red-bordered circular label “Type”; d) red paper, "Apterocyclus / waterhousei m /Sharp, 1908 / HOLOTYPE / des. M.J. Paulsen"; e) "Apterocyclus / waterhousei / Sharp, 1908 / det. M.J. Paulsen 2012".

Diagnosis.

The large, median tooth present on the meso- and metatibiae mentioned by Sharp ( 1908) for the holotype is present on all other specimens of both sexes, and not found in any other species. These large teeth, in addition to the broad, serrate protibiae and almost obsolete canthus separate this species from Apterocyclus honoluluensis (a few Apterocyclus honoluluensis have a weakly indicated tooth on the mesotibiae). The species is most similar to Apterocyclus munroi , but lacks distinct setae on the elytra and the anteriorly divergent clypeus. Specimens range from 18 to 22 mm in length.

Distribution.

Specimens have been examined from Kohua/Mohiki [Mohihi?] Stream, Kaholuamano, and near Waialae River (BPBM). Mizunuma (2000) illustrated specimens from Po’omau Canyon, and Fujita (2010) included specimens from Kohua Ridge and Po’omau Canyon.

Remarks.

Described from a single male, Sharp ( 1908) noted the thick legs, ‘crenulate’ protibiae, and pointed elytral apices (Fig. 8). No other specimens have been seen that exhibit the pointed elytral apices of the holotype, and we consider the character to be possibly aberrant and not of specific-level importance.