(Figs. 12–17)
Oligonychus rubicundus Ehara, 1971: 7, figs. 1–8, 11 – 14; Wang, 1981: 97, fig. 84. [Type locality: Hirosaki, Aomori Pref., type host: Miscanthus sinensis Anderss.]
Oligonychus (Reckiella) formosanus (nec Lo, 1969): Lo & Ho, 1989: 69 (in part).
Oligonychus shinkajii (nec Ehara, 1963): Bolland et al., 1989: 128.
Oligonychus formosanus (nec Lo, 1969): Ehara, 1999: 122.
O]İgοŊʸcÞuƽ ĽubİcuŊduƽ waS rɵgarđɵđ aS a juniΟr SynΟnym Οf O. ⌠οĽmοƽªŊuƽ LΟ by LΟ & HΟ (₁ ₉ ⁸ ₉ ﹚﹐ anđ ɭhɵ SynΟnymy waS accɵpɭɵđ by Ehara (₁ ₉₉₉ ﹚• HΟwɵVɵr﹐ O. ĽubİcuŊduƽ iS rɵcΟgnizɵđ hɵrɵ aS a VaIiđ SpɵciɵS đuɵ ɭΟ điffɵrɵncɵS in ɭhɵ Shapɵ Οf ɭhɵ aɵđɵaguS anđ pɵriɭrɵmɵ•
Namely, we had an opportunity to examine the holotype male and paratype females of O. formosanus, which were borrowed from the Taiwan Agricultural Research Institute. The aedeagal knob of formosanus (Fig. 22) is noticeably smaller than that of rubicundus (Figs. 15–17); and the female peritreme is straight distally in formosanus (Figs. 20–21) but hooked distally in rubicundus (Figs. 12–14). The female spinneret of formosanus is approximately as long as broad (Figs. 18–19), while in rubicundus it is slightly longer than broad, but sometimes approximately as long as broad (fig. 2 of Ehara, 1971). In addition, the female of rubicundus is red in color but the body color of female formosanus is not known.
Specimens examined. The type series of O. rubicundus was examined, in comparison with the holotype and a few paratypes of O. formosanus (Taipei, sugarcane).