1	Elytral humerus and hind wing well developed (Fig. 2)	2 (L.lesagei group)
–	Elytral humerus and hind wing reduced (Figs 8, 11)	3 (L.smetanai group)
2	Median lobe symmetrical, with apex rounded (Fig. 3C); southern Taiwan	L.lesagei Kimoto
–	Median lobe asymmetrical, with apex tapering (Fig. 6C); northern Taiwan	L.tsoui sp. n.
3	Elytra green, with yellowish brown suture and lateral margins (Fig. 11A–C); median lobe parallel-sided (Fig. 12C); apical margin of abdominal ventrite V in females with median notch narrow and shallow (Fig. 12I)	L.cheni sp. n.
–	Elytra entirely reddish brown or yellowish brown (Figs 8, 11D–F); median lobe apically tapering (Figs 9C, 13C); apical margin of ventrite V in female with median notch angular (Fig. 9I) or margined with longitudinal ridges (Fig. 13I)	4
4	Median lobe relatively broader, 5.7× longer than wide, elongate endophallic sclerite relatively longer, 0.7× as long as median lobe (Fig. 9C, D); apical margin of abdominal ventrite V in females with median notch angular (Fig. 9I)	L.smetanai Kimoto
–	Median lobe relatively more narrow, 6.8× longer than wide, elongate endophallic sclerite relatively shorter, 0.5× as long as median lobe (Fig. 13C, D); apical margin of abdominal ventrite V in females with median notch narrow and margined with longitudinal ridges (Fig. 13I)	L.jungchani sp. n.