Homoeusa japonica Sharp, 1874

Homoeusa japonica Sharp, 1874 View in CoL

Figs 2 B, E View Figure 2 , 3 C View Figure 3 , 9 A – L View Figure 9 , 10 A – H (Japanese name: Yamato-hirata-ariyadori View Figure 10 )

Homoeusa japonica Sharp, 1874: 5 (original description); Schülke and Smetana 2015; 682 (catalogue); Maruyama et al. 2013: 25 (distribution and bionomics mentioned). View in CoL

“ Homoeusa acuminata View in CoL ”; Sharp 1888: 283 (recorded from “ Miyanoshita ” as H. acuminata View in CoL , which is a misidentification).

Type material.

Lectotype (Fig. 1 B, E View Figure 1 ) • here designated; ♂; “ Japan. ” / G. Lewis. ” // “ Sharp Coll. ” / 1905-313 ” // “ Type ” (red round curator label) // “ SYN-TYPE ” (blue round curator label) // “ Homoeusa ” / “ japonica ” / “ type D. S. ” “ LECTOTYPE ” / “ Homoeusa ” / “ japonica ” / “ SHARP, 1874 ” / “ det. Maruyama, 2003 ” // “ NHMUK 014379775 ” ( NHM).

Nontypes in the Sharp Collection.

• 1 ex.; “ Homoeusa ” / “ japonica ” / “ var. ” / “ Japan Lewis. ” // “ Japan. ” / G. Lewis. ” (written on the card which the specimen mounted) // “ Sharp Coll. ” / 1905-313 ” // “ Homoeusa ” / “ japonica ” // “ Homoeusa ” / “ japonica ” / “ SHARP, 1874 ” / “ det. Maruyama, 2003 ” // ( NHM) • 1 ex.; “ Japan. ” / “ G. Lewis. ” / “ Sharp Coll. ” / 1905-313 ” // “ Homoeusa ” / “ japonica Sharp ” // “ Homoeusa ” / “ japonica ” / “ SHARP, 1874 ” / “ det. Maruyama, 2003 ” // ( NHM) • 2 exs.; “ Japan. ” / “ G. Lewis. ” / “ 1910-320. ” // “ Homoeusa japonica ” // “ Homoeusa ” / “ japonica ” / “ SHARP, 1874 ” / “ det. Maruyama, 2003 ” // ( NHM) • 1 ♂ “ Miyanoshita ” // “ Japan. ” / “ G. Lewis. ” / “ 1910-320. ” // “ Homoeusa ” / “ acuminata ” // “ Homoeusa ” / “ japonica ” / “ SHARP, 1874 ” / “ det. Maruyama, 2003 ” // “ Sharp (1874) ” / “ recorded as ” / ““ H. acuminata ”” / “ M. M. ” ( NHM).

Additional material examined.

Japan: Honshu: Aomori-ken • 2 ♂♂; Hyakuzawa-higashi, Iwakisan [ 40.629, 140.327], Hirosaki-shi ; 25. VI. 2023; TS. Nozaki leg. ( KUM) GoogleMaps . Iwate-ken • 1 ex.; Gandô-ko, Morioka-shi ; 9. VI. 2019; N. Nakaya leg. LFcfF ( IPMM) • 3 exs.; Takamatsu-kôen, Morioka-shi ; 22. VII. 2019; N. Nakaya leg. LFcfF ( IPMM) • 1 ex.; Kitayama-sansakuro, Morioka-shi ; 19. V. 2019; N. Nakaya leg. LFcfF ( IPMM) • 1 ex.; same locality; 5. V. 2019; N. Nakaya leg. LFcfF ( IPMM) • 1 ♂, 3 exs.; Kitayama, Morioka-shi ; 3. V. 2023; N. Nakaya leg. LFcfF ( IPMM) . Miyagi-ken • 1 ♀; Naruko-onsen, Osaki-shi ; 14–17. VI. 1999; M. Sano leg. LFO ( KUM) • 1 ♂; Aoba-yama, Sendai-shi ; 17. VII. 2004; K. Mizota leg. LFN ( KUM) • 2 ♀♀; Toriido-yama, Komono-chô ; 2. VI. 2012; N. Tsuji leg. ( KUM) . Akita-ken • 1 ♂; Tamagawa, Tazawako, Semboku-shi ; 12–13. VI. 1999; M. Sano leg. LFcfF ( KUM) . Fukushima-ken • 1 ♂, 2 exs.; Kashi Spa., Nishigo-mura ; 16. VI. 1998; M. Maruyama leg. LFcfF ( KUM) • 1 ♀, 2 exs.; same locality; 17. VI. 1998; M. Maruyama leg. LFcfF ( KUM) • 1 ♂, 1 ex.; Yukiwari-bashi, Nishigo-mura ; 29. VII. 2000; T. Kobashi leg. ( KUM) • 3 exs.; Mizuhiki, Tateiwa, Minamiaizu-machi ; 12. VI. 2004; H. Kamezawa leg. LFcfF ( cKam) . Ibaraki-ken • 1 ♂; Sadanami, Sekimoto-chô, Kitaibaraki-shi ; 4. V. 2022; Y. Komatsuzaki leg. ( KUM) • 1 ♂; Oshô-yama, Kitaibaraki-shi ; 24. IV. 2022; S. Fuda leg. ( KUM) • 1 ex.; Takeo-rindo (alt. 450 m), Hitachiota-shi ; 3. V. 2022; Y. Komatsuzaki leg. ( KUM) • 1 ♂; Asahi-tôge, Tsuchiura-shi ; 8. V. 2022; Y. Komatsuzaki leg. ( KUM) • 2 exs.; Nagai, Tsuchiura-shi ; 27. IV. 2022; Y. Komatsuzaki leg. ( KUM) . Tochigi-ken • 1 ♂, 1 ♀, 72 exs.; Ichikai-machi ; 29. IV. – 2. V. 2002; S. Nagashima leg. LFcfF ( KUM) . Gunma-ken • 2 ♂♂, 2 ♀♀, 4 exs.; Nakanojo Forest Park, Nakanojo-machi ; 8. VI. 2001; T. Watanabe leg. ( KUM) • 1 ex.; “ 4 km NW Onishidashi Rock Gdn. ”; “ 18–21. VII. 80 ” [1980]; A. & Z. Smetana leg. ( NMST, KUM, ex A. Smetana coll.) • 1 ex.; Sakurayama, Fujioka-shi ; 3. V. 1998; S. Arai leg. ( KUM) • 1 ♀, 28 exs.; Sakurayama Park, Onishi, Fujioka-shi ; 9. V. 1998; S. Arai leg. LFS ( KUM) • 1 ♂, 21 exs.; Mt. Sakurayama, Onishi, Fujioka-shi ; 9. V. 1998; K. Toyoda leg. LFS ( KUM) • 6 exs.; same locality; 18. V. 1998; K. Toyoda leg. LFS ( KUM) • 5 ♂♂, 1 ♀, 18 exs.; same locality; 22. V. 1999; Shiho Arai leg. LFS ( KUM) • 5 exs.; Nageishi-tôge, Fujioka-shi ; 5. VI. 2001; T. Watanabe leg. ( KUM) . Saitama-ken • 3 exs.; Sugiyama Jôshi, Ranzan-machi ; 29. IV. 2005; K. Toyoda leg. ( KUM) • 1 ex.; Mino-yama, Minano-machi ; 15. VII. 2000; K. Toyoda leg. ( KUM) • 10 exs.; Shioyama, Ranzan-machi ; 21. VI. 1996; K. Toyoda leg. ( KUM) • 1 ♂, 4 exs.; same locality; 8. VI. 1997; K. Toyoda leg. ( KUM) • 2 exs.; Mt. Shioyama, Ranzan-machi ; 10. V. 1998; K. Toyoda leg. LFcfF ( KUM) • 1 ex.; same locality; 3. VII. 1998; K. Toyoda leg. ( KUM) • 2 exs.; Shiro-yama, Kamagata, Ranzan-machi ; 17. VI. 2000; K. Toyoda leg. ( KUM) • 1 ex.; Near Toki-gawa, Ranzan-machi ; 22. IV. 1999; K. Toyoda leg. LFcfF ( KUM) • 5 exs.; Toki-gawa, Ranzan-machi ; 25. IV. 1999; K. Toyoda leg. ( KUM) • 2 exs.; same locality; 14. V. 2000; K. Toyoda leg. ( KUM) • 1 ex.; Shôgunsawa, Ranzan-machi ; 21. IV. 1999; K. Toyoda leg. ( KUM) • 2 exs.; Shiroishi-tôge, Higashichichibu-mura ; 9. V. 1999; K. Toyoda leg. ( KUM) • 3 exs.; same locality; 20. VI. 1999; S. Arai leg. ( KUM) • 2 exs.; Kuroishi Jinja, Kumai, Hatoyama-machi ; 29. IV. 2000; S. Arai leg. LFS ( KUM) • 1 ♂, 1 ex.; Nr. Ôno Pass, Tokigawa-machi ; 5. VIII. 1998; K. Toyoda leg. LFcfF ( KUM) • 1 ex.; Ushidatekubo (alt. 830 m) [ 35.9685, 139.1793], Tokigawa-machi ; 21. V. 2023; S. T. Inoue & N. Katsube leg. LFcfF ( KUM) GoogleMaps • 1 ex.; Hashidate, Chichibu-shi ; 26. IV. 1998; K. Toyoda leg. LFS ( KUM) • same locality; 26. IV. 1998; S. Arai leg. ( KUM) • 1 ♂, 1 ex.; same locality; 17. VIII. 1999; K. Toyoda leg. LFN ( KUM) • 1 ♀, 5 exs.; same locality; 30. VII. 2000; K. Toyoda leg. LFN ( KUM) • 1 ex.; same locality; 7. VI. 2002; K. Toyoda leg. ( KUM) • 1 ex.; Tenjinsha, Kita-hirasawa, Hidaka-shi ; 4. VI. 1999; K. Toyoda leg. ( KUM) . Chiba-ken • 11 exs.; Azeta, Sakura-shi ; 20. VI. 1998; M. Maruyama leg. LFS ( KUM) • 1 ♀, 4 exs.; same locality; 23–24. VI. 1998; M. Maruyama leg. LFS ( KUM) • 2 exs.; same locality; 20–26. VI. 1998; M. Maruyama leg. LFS ( KUM) • 2 exs.; same locality; 24. VI. 1998; M. Sano leg. ( KUM) • 3 exs.; Aoba, Chiba-shi , 24. VI. 1998; M. Maruyama leg. LFS ( KUM) • 6 exs.; Mt. Mifuneyama, Shôkô, Kimitsu-shi ; 24. IV. 2006; H. Ono leg. LFN ( KUM) • 6 exs.; same locality; 7. V. 2006; H. Ono leg. ( KUM) • 1 ♀; Umegase, Daifuku-yama, Ichihara-shi , 6. V. 1998; S. Naomi leg. ( KUM) • 2 exs.; Shimin-nomori Yachô-no-mori, Toyooka, Futtsu-shi ; 19. IV. 2006; H. Ono leg. ( KUM) . Tokyo-to • 2 exs.; Kurosawa, Oume-shi ; 29. IV. 1998; U. Kurosu leg. ( SPMN) • 1 ex.; Dokan-bori, Imperial Palace, Chiyoda-ku ; 17. V. 2000; T. Shimada leg. ( NSMT) • 3 exs.; Mt. Takao, Hachiôji-shi ; 1. V. 1985; S. Kubota leg. ( KUM) • 1 ex.; Mt. Takao (alt. 500 m), Hachiôji-shi ; 1. VII. 1998; M. Maruyama leg. LFS ( KUM) • 3 exs.; same locality; 4. VII. 1998; M. Maruyama leg. LFS ( KUM) • 1 ex.; same locality; 1–4. VII. 1998; M. Maruyama leg. LFS ( KUM) • 1 ♂, 2 ♀♀, 20 exs.; same locality; 4. VI. 2001; M. Maruyama leg. LFS ( KUM, NHM) • 3 exs.; Mt. Takao (alt. 450 m), Hachiôji-shi ; 4. VI. 2001; M. Maruyama leg. LFS ( NHM) . Kanagawa-ken • 1 ♂, 1 ex.; Mt. Masukata, Kawasaki-shi ; 15. VI. 1996; K. Kawada leg. ( KUM) • 5 exs.; Ikuta-ryokuchi, Kawasaki-shi ; 13. IV. 2002; K. Matsumoto leg. ( KUM) • 4 exs.; Mikage, Tsukui, Sagamihara-shi ; 18. IV. 1976; R. Kiryu leg. ( SCM) • 2 ex.; same locality; 23. IV. 1977; R. Kiryu leg. ( SCM) • 1 ex.; same locality; 14. IV. 1979; R. Kiryu leg. ( SCM) • 1 ex.; same locality; 31. V. 1979; R. Kiryu leg. ( SCM) • 2 exs.; same locality; 9. VI. 1979; R. Kiryu leg. ( SCM) • 1 ex.; Nanzawa, Tsukui, Sagamihara-shi ; 29. V. 1976; R. Kiryu leg. ( SCM) • 4 exs.; same locality; 14. V. 1977; R. Kiryu leg. ( SCM) • 2 exs.; same locality; 20. V. 1977; R. Kiryu leg. ( SCM) • 1 ex.; same locality; 22. IV. 1979; R. Kiryu leg. ( SCM) • 1 ex.; same locality; 24. V. 1979; R. Kiryu leg. ( SCM) • 1 ex.; Miyagase, Tsukui ; 9. VII. 1976; R. Kiryu leg. ( SCM) • 12 exs.; Toya, Tsukui, Sagamihara-shi ; 11. V. 1976; R. Kiryu leg. ( SCM) • 8 exs.; same locality; 27. IV. 1976; R. Kiryu leg. ( SCM) • 5 exs.; same locality; 29. IV. 1977; R. Kiryu leg. ( SCM) • 1 ex.; same locality; 17. IV. 1979; R. Kiryu leg. ( SCM) • 17 exs.; Kawasaki ; 1. V. 1985; S. Kubota leg. ( KUM) • 2 exs.; “ Trap (liver) St. 1 Y. N. S ”; Yokohama-shi ; 10. V. 1988; Y. Kominami leg. ( SPMN) • 3 exs.; Niiharu-shiminno-mori, Yokohama-shi ; 21. V. 2001; T. Watanabe leg. LFO, LFS ( KUM) • 1 ex.; Nonkendainomori, Enkaizan, Yokohama-shi ; 3. V. 1991; K. Kubo leg. ( SPMN) • 1 ex.; Yakunimi-yama [35.35, 139.17], Hadano-shi ; 26. VI. 2014; O. Saitoh leg. LFcfF ( KPMNH) • 4 exs.; Kawana, Fujisawa-shi ; 14. V. 2001; T. Watanabe leg. ( KUM) • 1 ♂, 15 exs.; Jimmu-ji, Zushi-shi ; 20. VI. 2003; M. Maruyama leg. ( KUM) • 1 ex.; Futagoyama, Zushi-shi ; 15. IV. 1991; H. Watarai leg. ( SPMN) • 1 ex.; Kinugasa, Yokosuka-shi ; 26–27. IV. 1995; Y. Kaneko leg. ( KUM) • 3 exs.; Miyanoshita, Hakone, Hakone-machi ; 5. V. 1987; Y. Hirano leg. ( KUM) • 1 ex.; Hakone ; 1. V. 1974; Y. Hirano leg. ( KUM) • 1 ex.; Miura Kurihama, Sagamihara-shi ; 9. V. 1979; R. Kiryu leg. ( SCM) . Yamanashi-ken • 1 ex.; Ashiyu-onsen, Ashiyu-mura ; 23. V. 2001; T. Watanabe leg. ( KUM) . Nagano-ken • 1 ♀, 1 ex.; Bôdaira, Shiga-kôgen (alt. 1,160 m) [ 36.7203, 138.4656], Yamanouchi-machi ; 9. VII. 2022; TS. Nozaki leg. LFM ( KUM) GoogleMaps • 1 ♂; Fujii, Satoyamabe, Matsumoto-shi ; 7. VII. 2022; TS. Nozaki leg. LFN ( KUM) . Gifu-ken • 2 ♂♂; Bijo Pass, Takayama-shi , 5. VIII. 2003; K. Kinomura leg. ( KUM) • 8 exs.; Ogamigo, Shôkawa (alt. 800 m), Takayama-shi ; 5–6. VIII. 1998; M. Maruyama leg. LFS ( KUM) • 1 ex.; Isshiki, Takayama-shi ; 23. V. 2004; K. Kinomura leg. LFN ( KUM) • 1 ex.; Mt. Kentô, Takayama-shi ; 6. VII. 2003; K. Kinomura leg. ( KUM) • 1 ♂; Neo-Mizudori, Motosu-shi ; 4. VII. 2022; TS. Nozaki leg. LFN ( KUM) • 1 ex.; Miyachi [Gifu-ken?] ; 29. IV. 1980; Y. Ohta leg. ( KUM) • 1 ex.; Yôrô Park, Yôrô-chô ; 29. IV. 2004; K. Kinomura leg. ( KUM) . Shizuoka-ken • 1 ex.; Kumazaka, Izu-shi ; 30. V. 2022; T. Tenma leg. ( KUM) . Aichi-ken • 1 ♀, 2 exs.; Jôkôji-kôen, Seto-shi ; 16. IV. 2023; T. Tenma leg. ( KUM) • 1 ♂, 7 exs.; Magarida, Toyooka-chô, Gamagori-shi ; 4. V. 2024; T. Temma leg. LFcfF ( KUM) . Kyoto-fu • 1 ♀; Amagase Forest, Uji ; 8. V. 2013; T. Ito leg. ( OMNH) . Osaka-fu • 1 ♂; Mt. Myoken ; 2. V. 2015; T. Ito leg. ( OMNH) • 1 ♀; same locality; 8. V. 2012; T. Ito leg. ( OMNH) • 1 ♂; Mino-o Park ; 6. VI. 2009; T. Ito leg. ( OMNH) . Nara-ken • 1 ♂; Yamato-Koriyama, Yata ; 18. V. 2009; T. Ito leg. ( OMNH) . Wakayama-ken • 2 ♂♂, 2 ♀♀, 3 exs.; Nishihara (alt. 180 m) [ 33.781, 135.413], Hidakagawa-chô ; 11. VI. 2023; TS. Nozaki leg. LFS ( KUM) GoogleMaps . Tottori-ken • 1 ♂; Mt. Hôbutsu (alt. 420 m) [ 35.2271, 133.4561], Hino-chô ; 17. VI. 2024; TS. Nozaki leg. ( KUM) GoogleMaps . Shimane-ken • 1 ♂, 3 exs.; Urahikimi, Masuda-shi, Masuda-shi ; 6. VI. 1998; S. Nomura leg. LFS ( KUM) . Okayama-ken • 2 ♂♂, 1 ♀, 5 exs.; Ono Shine, Kawakami, Ohara-chô, Mimasaka-shi ; 5. V. 2009; Y. Fujitani leg. LFS ( KUM) • 1 ex.; same locality; 7. V. 2009; Y. Fujitani leg. ( KUM) • 1 ex.; same locality; 15. V. 2009; Y. Fujitani leg. ( KUM) • 1 ex.; same locality; 24. V. 2009; Y. Fujitani leg. ( KUM) . Hiroshima-ken • 1 ♂, 3 exs.; Kakezu-yama, Higashiyawatahara (alt. 850–1,126 m), Kitahiroshima-chô ; 9–18. V. 2009; TA. (Tastuya) Nozaki & Y. Nozaki leg. FIT ( KUM) . Yamaguchi-ken • 1 ex.; Nishimagura, Kusunoki (alt. 100 m); Ube-shi ; 30. V – 1. VI. 2000; T. Kishimoto leg. ( KUM) . Shikoku: Tokushima-ken • 1 ex.; Takashiro-yama, Naka-chô ; 24. V. 2007; H. Fujimoto leg. ( KUM) . Kagawa-ken • 1 ex.; Furodani, Miki-chô ; 30. VII. 2000; K. Izawa leg. LFcfF ( KUM) • 1 ex.; Usa-jinja, Nagaona, Sanuki-shi ; 31. V. 2001; Maruyama et al. leg. LFS ( KUM) • 1 ♂, 1 ex.; Fujio-Jinja, Nishi-uta-chô, Takamatsu-shi ; 31. V. 2001; Maruyama et al. leg. LFN ( KUM) • 3 exs.; same locality; 1. VI. 2001; Maruyama et al. leg. LFN ( KUM) • 1 ex.; Ôtawa, Nagao, Sanuki-shi ; 22. V. 2000; F. Ito leg. LFM ( KUM) • 1 ♂, same locality; 7. VI. 2001; F. Ito leg. ( KUM) • 2 exs.; Kamiyama, Miki-chô ; 1. VI. 2001; Maruyama et al. leg. LFS ( KUM) • 13 exs.; Atago-yama, Kotohira-chô ; 1. VI. 2001; M. Maruyama leg. LFS ( KUM) • 1 ♀, 7 exs.; Ôtaki-san, Shionoe-chô, Takamatsu-shi ; 2. VI. 2001; Maruyama et al. leg. ( KUM) • 1 ex.; Daisen-zan, Kotonami-chô ; 1. VI. 2001; Maruyama et al. leg. LFM ( KUM) . Ehime-ken • 1 ex.; Higashino, Matsuyama-shi ; 30. V. 2015; Y. Hisasue leg. ( KUM) • 3 ♀♀; same locality; 30. V. 2015 ( KUM) • same locality; 22. IV. 2017; R. Koga leg. ( EUMJ) . Kochi-ken • 1 ♀; Ashizuri-misaki (alt. 120 m) [ 32.748, 133.0136], Tosashimizu-shi ; 21. V. 2024; TS. Nozaki leg. ( KUM) GoogleMaps . Kyushu: Fukuoka-ken • 1 ex.; Mt. Inunaki, Miyawaka-shi ; 22. V. 1980; T. Gotô leg. ( KUM) • 1 ex.; Mt. Tachibana ; 6–9. V. 1996; T. Ueno, Y. Higashiura & H. Goto leg. FIT ( cSch) • 1 ex.; same locality; 10–14. V. 1996; T. Ueno, Y. Higashiura & H. Goto leg. FIT ( cSch) • 1 ♀; Takasubaru Highland, Mt Hikosan, Soeda-machi ; 26. VI. 2022; S. G. (Shugo) Inoue leg. LFcfF ( KUM) • 2 exs.; Biol. Lab. Mt. Hikosan, Soeda-machi ; 7. VI. 1993; S. Nomura leg. LFcfF ( KUM) • 2 ♂♂, 1 ♀; Biol. Lab. KU, Hikosan, (alt. 750 m) [33.48, 130.90], Soeda-machi ; 22. V. 2022; TS. Nozaki leg. LFcfF ( KUM) • 2 ♂♂, 1 ♀; same locality; 16. V. 2023; TS. Nozaki leg. LFcfF ( KUM) . Saga-ken • 1 ♀, 1 ex.; Mt. Kurokami-yama, Arita-chô ; 28. IV. 2019; M. Nishida leg. LFcfF ( KUM) • 2 exs.; same locality; 15. V. 2019; M. Nishida leg. ( KUM) • 1 ♂; Mt. Kurokami-yama (alt. 400 m), Arita-chô ; 9. V. 2021; Y. Hisasue leg. LFcfF ( KUM) • 1 ex.; Tosen-zan, Ureshino-shi ; 29. IV. 2018; M. Nishida leg. FIT ( KUM) . Nagasaki-ken • 1 ♂; Tanuki-no-o, Omura-shi ; 5. V. 2018; M. Nishida leg. ( KUM) . Oita-ken • 2 ♀♀; Oike, Kurodake, Yufu-shi ; 17. VI. 2021; TS. Nozaki leg. ( KUM) . Miyazaki-ken • 1 ♂; Ômoridake forest road (alt. 600 m) [ 32.0435, 131.1973], Aya-machi ; 12. VI. 2024; TS. Nozaki & T. Kinoda leg. LFS ( KUM) GoogleMaps .

Diagnosis.

This species is distinguished from the other species of the genus by the following combination of characteristics: pronotal posterolateral angle around 90 degrees (Fig. 9 C View Figure 9 ); elytra distinctly widened posteriad entirely (Fig. 9 C View Figure 9 ); apical lobe of paramere long, length about half of whole paramere, curved ventrally, apex simply round (Fig. 9 I, J View Figure 9 ). This species is quite similar to H. longicornis in its general appearance; however, the round apex of the parameral apical lobe can separate it.

Redescription.

Body (Figs 3 C View Figure 3 , 10 H View Figure 10 ) medium-sized, broad, stout; dorsal surface mostly moderately polished.

Head large; color reddish brown to dark brown; eyes large. Antennae (Fig. 9 A, B View Figure 9 ) long; relative length of each antennal segment from first to 11 th, 2.32: 1.48: 1.19: 1.07: 1.05: 1.01: 1.00: 1.01: 1.25: 1.4: 2.88.

Thorax. Pronotum (Fig. 9 C View Figure 9 ) subrectangular, transverse ( PW / PL, 1.59–1.71), widest near middle, postero-lateral angle around 90 degrees, posterior margin slightly sinuate, reddish yellow to reddish brown, surface finely covered with setae and punctures, gently polished and slightly reticulated. Elytra (Fig. 9 C, D View Figure 9 ) distinctly widened posteriad entirely, posterior margins shallowly notched near lateral corners, reddish yellow to reddish brown, surface finely covered with setae and punctures; gently polished and weakly reticulated. Hind wings developed. Mesoventral process (Fig. 9 E View Figure 9 ) very narrow, with weak medial carina, forming Y-shaped, apex sharply pointed, reaching posterior 1 / 3 of mesocoxal cavities. Metaventral process weakly produced.

Abdomen elongate, narrowed posteriad; surface covered with short setae and each posterior margin with long stout setae; finely reticulated.

Male: 8 th sternite (Fig. 9 F View Figure 9 ) rounded at posterior margin; median lobe of aedeagus (Fig. 9 H View Figure 9 ) slender, length about 0.55 mm, apical lobe narrow and elongate, slightly curved dorsally, apex gently pointed in lateral view, apical valves simple and elongate, without dorsal arms, basal part of copulatory piece very small. Paramere (Fig. 9 I, J View Figure 9 ) length about 0.65 mm; apical lobe of paramere very long, length about half of whole paramere, curved ventrally, slightly dilated apicad, apex simply round; four setae, a far longer than others, b located most apically, velum short and suboval.

Female: 8 th sternite (Fig. 9 G View Figure 9 ) truncated or slightly rounded at posterior margin; spermatheca (Fig. 9 K, L View Figure 9 ) S-shaped, base of apical part not swollen, base largely hooklike.

Variations.

Geographical variations were found in the parameral apical lobe. The populations from Chugoku, Shikoku, and Kyushu had a less curved apical lobe, with a finely dentate dorsal margin (Figs 9 I View Figure 9 , 10 A View Figure 10 ), whereas the population from the eastern part of Honshu had a more curved apical lobe with a smooth dorsal margin (Figs 9 J View Figure 9 , 10 B – D View Figure 10 ). The distribution of each population is shown in Fig. 10 E View Figure 10 .

Measurements (in mm) and ratios.

Body parts (N = 19): BL ≈ 2.14–3.27; AL, 0.81–1.03; HW, 0.51–0.66; PL, 0.48–0.63; PW, 0.78–1.03; EL, 0.42–0.51; EW, 0.85–1.02; HTL, 0.52–0.67; PW / PL, 1.59–1.71; AL / PL, 1.36–1.86; HTL / PL, 0.94–1.15.

Distribution.

Japan (Honshu, Shikoku, Kyushu) (Fig. 10 E View Figure 10 ).

Symbiotic hosts.

Lasius fuliginosus species group: L. cf. fuliginosus , L. morisitai , L. nipponensis , L. orientalis , L. spathepus .

Bionomics.

Homoeusa japonica can be observed in Lasius fuliginosus species group foraging trails on the forest floor from April to August (Fig. 10 F View Figure 10 ). Only a few individuals were collected using FIT (N = 7). They frequently raised the tip of their abdomen toward approaching host ant workers, both in the field and indoors (Fig. 10 G View Figure 10 ).

Remarks.

According to the original description ( Sharp 1874), the type locality was assumed to be Nagasaki City, Nagasaki Prefecture, Kyushu. This species was rarely collected from the trails of L. nipponensis and L. orientalis .

The differences in the parameres between the two populations were significant; however, no other differences were found. They may have been distributed separately because they were never collected from the same locality. We conclude that they can be reasonably treated as intraspecific populations. This species tends to occur at lower altitudes than H. longicornis does.