Idiocerus formosanus Matsumura

Fig. 5C, D

Idiocerus taiwanus Matsumura- Huang and Maldonado-Capriles 1992: 4 (listed); Xue et al. 2017: 407 (listed).

Remarks.

This species was described from an unknown number of specimens (syntypic) from Koshun (= Hengchun), southern Taiwan. Both Andy Hamilton and Masami Hayashi (pers comm.) examined the type series in Entomological Institute, Hokkaido University, Sapporo, Japan (9 ♂♂ and 4 ♀♀) and the latter’s photographs of a syntype are reproduced here (Fig. 5C, D). One of the male syntypes had been dissected and bears a determination label by Andy Hamilton indicating the species belongs to Amritodus, which needs to be confirmed, together with an unpublished lectotype label. The label information on the specimens is as follows (hw = handwritten, pr = printed), double quotation marks show each label, a single oblique line (except between day and month) is used for changing to new line, and the description on underside is indicated after double oblique lines:

1 male [dissected], "Formosa / Matsumura [printed] // Koshun / 7/7-02 [hw]", " I. formosanus n.sp. [hw] / det. Matsumura [pr]", "Type Matsumura" (red printed label), "Lectotype [red printed label] / Idiocerus formosanus Mm. [hw by K.G.A. Hamilton, not published]", " Amritodus formosanus (Matsum.) / Det. KGAH ’76” [in double red frame, hw]. 2 male, same data as previous, "PARATYPES [yellow printed label] / Idiocerus formosanus Mm. [hw]"

4 male, 3 female, [upper right male dissected], "Formosa / Matsumura [pr] // 7/VII 1906 | Koshun [hw]", "Paratypes (yellow printed label) / Idiocerus formosanus Mm." [hw];

1 female, "Formosa / Matsumura [pr] // 29/VI 1906 / Koshun (hw)"

1 male, "Formosa / Matsumura [pr] // 7/VII 1906 / Koshun [hw]

1 male, "Formosa / Matsumura [pr] // 10/VIII 1906 / Koshun [hw]"