Aphanerostethus falcatus Kojima, Lewis & Fujisawa sp. nov.

Figs 1 I – L, 3, 5 D – F, 10 B, 15 E, F, 17 C, D

Specimens examined.

Holotype: Vietnam: Lam Dong Province: • Mount Lang Biang, 12°02'N, 108°26'E, elevation 1700 m, 18. II. 2011, H. Kojima, male deposited in TUA, JHLHY_DAR_153 . Paratypes: Vietnam: Lam Dong Province: • Mount Lang Biang, 12°02'N, 108°26'E, elevation 1700 m, 17–18. II. 2011, H. Kojima, (21, TUA; 1 OIST), JHLHY_DAR_094, JHLHY_DAR_096 (EGP 0160 D 01), JHLHY_DAR_097, JHLHY_DAR_099, JHLHY_DAR_110 (EGP 0160 C 12), JHLHY_DAR_112 (EGP 0160 D 02), JHLHY_DAR_116 (EGP 0160 D 10), JHLHY_DAR_117 (EGP 0160 D 09), JHLHY_DAR_119 (EGP 0160 D 07), JHLHY_DAR_154 – JHLHY_DAR_166 ; • near Phi Lieng, Lam Ha, 21. II. 2011, H. Kojima, (1, TUA), JHLHY_DAR_118 (EGP 0160 D 11) ; • Da Knang, Dam Rong District, 23. II. 2013, H. Kojima, (1, TUA), JHLHY_DAR_122 (EGP 0160 E 01) ; • same locality, 2. III. 2014, Y. Fujisawa, (1, TUA); • Mount Lang Biang, 12°02'N, 108°26'E, elevation 1700 m, 20–26. II. 2013, H. Kojima, (18, TUA; 2, OIST), JHLHY_DAR_091, JHLHY_DAR_109 (EGP 0160 D 04), JHLHY_DAR_168 – JHLHY_DAR_179, JHLHY_DAR_181 – JHLHY_DAR_186 .

Diagnosis.

Body length 1.7–2.1 mm. Cuticle coated in dark, sandy gray, and white scales in indistinct pattern. Funicle with six articles. Procoxae contiguous. Only odd-numbered elytral intervals with erect scales. Erect elytral scales evenly distributed, not concentrated in bundle. Elytral interval 5 + 6 not distinctly arched at base. Hind femora with distinct tooth along ventral edge. Fore- and mid-femur with minute tooth. Scutellum reduced. Prosternal cavity prominent and with steep lateral ridges. Metaventrite with a distinct elevated transverse ridge separating the meta- and mesocoxae. Metatibial uncus sickle-shaped in male (Fig. 1 I – L). Aedeagus tapering over apical half, and swelling at tip (Fig. 15 E, F), unevenly curved in lateral view; clearly bent ventrally at apex (Fig. 15 E, F). Internal sac with basal protruding structure (Fig. 15 E, F).

Distribution.

This species is currently only known from Lam Dong Province (Mt. Lang Biang, Phi Lieng, and Da Knang), Vietnam.

Etymology.

The specific name falcatus is a Latin adjective in reference to the sickle-shaped metatibial uncus of males (Fig. 1 I – L).