Mexico taiwanus (Satô, 1994) comb. nov. Figs 11G, 17 Babalimnichus taiwanus Satô, 1994: 174. Babalimnichus masamii – Yoshitomi & Arai 2004: 23. Material examined JAPAN • 17 ex.; “Hikawa-hama Yonaguni-jima OKINAWA 18. VI. 2001 Koji TOYODA leg.”; EUMJ • 4 ex.; “Dannuhama Yonaguni-jima 26-VIII-1994 M. Sato leg.”; EUMJ. TAIWAN • 1 ♂, 1 ♀, 5 ex.; “ Lung Keng Pintung Taiwan 10-VIII-2000 M. Sato leg.”; EUMJ • 1 ex.; “ Mao tantou Pintung, Taiwan 10-VIII-2000 M. Sato leg.”; EUMJ • 1 ex.; “ Lutao Taiwan 26-28. III. 1998 M. Sato leg.”; EUMJ • 5 ex.; “ Lanhsu Taiwan 5–10. VIII. 1998 M. Sato leg.”; EUMJ • 3 ex., in ethanol; “ Fushan Village Donghe Township, Taitung Country, Taiwan 1-V-2013 Tatsuya Niisato leg.”; EUMJ. Redescription Male For a detailed description of the external features, see the original description (Satô 1994). PW/ PL 1.67–2.44 (2.00); EL/ EW 1.18–1.42 (1.32); EL/ PL 2.33–3.40 (2.87); EW/PW 1.00–1.15 (1.09); TL/ EW 1.59–1.92 (1.78). Sternite VII (Fig. 17A) with two pairs of long, stout extra setae, bearing about 20 long setae, bifid in postero-lateral corners, gently projecting triangularly in median part of caudal margin. Sternite VIII (Fig. 17B) small, slightly sclerotized, Y-shaped. Sternite IX (Fig. 17C) slender, lightly curved in basal part; apical plates long and slender, pointed at apices. Aedeagus (Fig. 17 D–F) relatively short, asymmetrical; basal piece oval; lateral lobes short, with 2–4 apical setae; median lobe a little wide, sparsely punctuate in apical part, slightly expanded in apical quarter, pointed at apex; ventral plates relatively slender, separated from median lobe, left one with thumb-like projection on inner margin of apex; ML/ BL 2.42; ML/ LL 2.42. Female Sexual dimorphism slight. Sternite VII (Fig. 17G) similar to that of male. Urosternite (Fig. 17H) well sclerotized, with long and slender apodeme, T-shaped. Ovipositor (Fig. 17I) well sclerotized; coxite sparsely punctuate, rather pointed at apices; apices of baculus bifid; approximate ratio of coxite and baculus (n = 1) 1.0:5.3. Measurements Unsexed (n = 20): TL 1.68–2.17 (1.95) mm; PW 0.90–1.10 (1.01) mm; PL 0.40–0.60 (0.51) mm; EL 1.28–1.62 (1.44) mm; EW 1.00–1.15 (1.10) mm. Distribution Taiwan (including Lutao and Lanhsu Islands), Japan (Yonaguni-jima). Remarks This is the first record of this species from Lutao and Lanhsu Islands, off Taiwan, and Yonaguni-jima.

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 32-34, DOI: 10.5852/ejt.2019.583, http://zenodo.org/record/3564532