Mexico masamii (Satô, 1994) comb. nov. Figs 11F, 18–19 Babalimnichus masamii Satô, 1994: 175. Babalimnichus masamii – Yoshitomi & Satô 2001: 472 [larval description]. — Yoshitomi 2014a: 29. — Ono et al. 2012: 47. — Kamezawa 2017: 54. Material examined JAPAN • 7 ex.; “ Japan: Honshû Nanaura-kaigan Tachibana, Sado-shi Niigata, 5. vi. 2016 37.986591, 138.234143 Kamezawa H. leg.”; EUMJ • 1 ♂; “[IZ9] Ishijirogawa, Shikinejima, Izu Isls., Japan, 34°19.409″ N, 139°13.308″ E, ca 16 m, 7. II. 2013, H. Yoshitomi leg.”; EUMJ • 1 ♂, 1 ♀, 14 ex.; “ Kariya-kaigan Tokoname-shi Aichi Pref. 17. VIII. 1995, 17. VIII. 1995 H. Yoshitomi leg.”; 1 ♂ and 1 ♀ on slides HY 989, 992–994; EUMJ • 1 ex.; “ Zoubigasaki, Murozumi Hikari-shi Yamaguchi Pref., Jpn 28. VII. 2005 Y. Fujitani leg.”; EUMJ • 5 ex.; “ Bashayamamura Amami-oshima 3-V-1999 M. Sato leg.”; EUMJ • 28 ex.; “ Kawata Okinawa 5-V-1999 M. Sato leg.”; EUMJ • 9 ex.; “ Kim-kaigan Okinawa 28- III-1997 M. Satô leg.”; EUMJ • 1 ex.; “ Onnason Okinawa-jima 26-28. IV. 2004 M. Sato leg.”; EUMJ • 1 ex.; “ Kume-jima Ryukyu 30-IV-2004 M. Sato leg.”; EUMJ • 2 ex.; “ Tomori Ryukyus Miyako-jima 7-V-1998 M. Satô leg.”; EUMJ • 13 ex.; “ Uganzaki Ishigaki 22-IX-2003 M. Sato leg.”; EUMJ • 7 ex., in ethanol; “ Sakaura, Izumo, Shimane 31. VII. 2006 M. Hayashi ”; EUMJ • 2 pupae, with larval skins, in ethanol; “ Nahama-kaigan, Nagai, Yokosuka-shi Kanagawa Pref., Japan 6. July 2007 M. Asano leg.”; EUMJ. Redescription Male For a detailed description of the external features, see the original description (Satô 1994). PW/PL 1.67– 2.22 (1.99); EL/EW 1.27–1.48(1.36);EL/ PL 2.64–3.29 (2.96); EW/PW 1.00–1.18 (1.10);TL/EW1.71– 1.95 (1.82). Sternite VII (Fig. 18A) bearing about 30 long setae, lacking extra setae; postero-lateral corners short and pointed; median part of caudal margin gently projecting triangularly. Sternite VIII (Fig. 18B) small, slightly sclerotized, Y-shaped. Sternite IX (Fig. 18C) well sclerotized, curved in basal part, shallowly concave at apex; apical plates rather stout, pointed at apices. Aedeagus (Fig. 18 D–F) relatively short, asymmetrical; basal piece oval; lateral lobes short, with 3–4 apical setae; median lobe wide, sparsely punctuate in apical part, expanded in apical quarter, gently pointed at apex; ventral plates wide, separated from median lobe, left one long and curved interiorly in apical part, right one short and straight; ML/BL 2.24; ML/LL 2.43. Female Sexual dimorphism slight. Sternite VII (Fig. 18G) similar to that of male. Urosternite (Fig. 18H) well sclerotized, T-shaped, with long and slender apodeme. Ovipositor (Fig. 18I) well sclerotized; coxite sparsely punctuate, rather pointed at apices; apex of baculus bifid; approximate ratio of coxite and baculus (n = 1) 1.0:5.9. Pupae Body (Fig. 19) about 1.5 mm, cream-colored, bearing long setae on head, pronotum, elytra and abdomen. Measurements Unsexed (n = 20): TL 1.82–2.32 (2.04) mm; PW 0.90–1.10 (1.02) mm; PL 0.45–0.60 (0.52) mm; EL 1.32–1.72 (1.53) mm; EW 1.00–1.30 (1.12) mm. Distribution Japan (Honshu, Sadogashima, Izu Islands (Shikine-jima, Kozu-shima), Shikoku, Kyushu, the Ryukyus (Yakushima, Amami-Ôshima, Tokuno-shima, Okinoerabu-jima, Yoron-tô, Okinawa-jima, Irabu-jima, Kume-jima, Miyako-jima, Ishigaki-jima)). Remarks I re-examined the specimens from Yonaguni-jima (Yoshitomi & Arai 2004), and it is clear that they do not represent this species but the preceding one. This is the first record of this species from Kume-jima. This species has the northernmost distribution (Sado Island) in the subfamily Thaumastodinae (Kamezawa 2017). Biological notes Overwintering takes place in the larval stage in Chiba Prefecture (Ono et al. 2012) or the adult stage on the Izu Islands (Yoshitomi 2014a).

Published as part of Yoshitomi, Hiroyuki, 2019, Review of the Asian Thaumastodinae (Coleoptera, Byrrhoidea, Limnichidae), with a phylogeny of the genera, pp. 1-45 in European Journal of Taxonomy 583 on pages 34-37, DOI: 10.5852/ejt.2019.583, http://zenodo.org/record/3564532