Homoplectra japonica (Banks 1906), New combination .

(Fig. 5)

Arctopsyche japonica Banks 1906, 111, 113, color pattern of forewing.

Specimens examined. Kyushu, Fukuoka: 11 males, Mt. Hiko-san, Soeda-machi, 19.v.1993, N. Kuhara (KuN) .

Remarks. Banks (1906) described Arctopsyche japonica based on specimens collected from Hikosan, Buzen (now Fukuoka, Kyushu), and a figure of distinct yellow markings of the left forewing was provided. He also recorded this species from Gifu, central Honshu, but precise data were not provided (Banks 1906). Ulmer (1907) transferred this species to the genus Diplectrona based on examination of males collected from Gifu, which have similar markings to the illustration by Banks (1906). However, according to photographs of a syntype male collected from Hikosan, and deposited in the Museum of Comparative Zoology, Harvard University (Figs 5A–5D: photographed by C. W. Farnum), the male bears a club-like process on each anterolateral corner of abdominal sternum V (s.V) (marked with an arrow in Fig. 5B). Furthermore, in male genitalia (Fig. 5C), each inferior appendage (i.a.) is onesegmented, and the large phallic apparatus (ph.) bears long spine-like processes. Males collected from the same area as the syntype male was collected have the same genitalic morphology (Fig. 5E). This species therefore belongs to the genus Homoplectra, and not to Diplectrona .

After the publication by Banks (1906), many authors recorded D. japonica based on the characteristic markings of the forewings; however, Kawase & Morita (2014) noted that multiple species have this character. This taxonomic problem warrants future work.