Emarginata trilucida (Jeng et al. 2003b) comb. nov.

Luciola trilucida Jeng et al. 2003b: 249 . Ballantyne & Lambkin 2013 fig.3 blue number 2. Fu 2014: 28.

Type. Male. TAIWAN. (NMNS) .

Other specimens examined. THAILAND. S.N. = Sorasak Nak-eiam. 16°06’ N, 99°06’ E, Kamphaeng Phet province, Khlong Lan district, 1,302 msl., 16.vi.2007, lower montane forest, 6 males (SN˗ KPB ˗002) S.N. (NUNHM) . 16°11’ N, 99°16’ E, Kamphaeng Phet province, Khlong Lan district, 237 msl., 13.vi.2012, dry evergreen forest, 3 males (SN ˗ KPB ˗019) S.N. (NUNHM) . 16°06’ N, 99°06’ E, Kamphaeng Phet province, Khlong Lan district, 1,302 msl., 14.vi.2012, lower montane forest, 2 males (SN ˗ KPB ˗025) S.N. (NUNHM) . 19°16’ N, 98°33’ E, Mae Hong Son province, Pai district, 1,187 msl., 3.vi.2011, pine forest, 1 male (SN ˗ MSB ˗029) S.N. (NUNHM) . 16°60’ N, 101°00’ E, Phitsanulok province, Nakhon Thai district, 1,200 msl., 15.vii.2013, lower montane forest, 1 male (SN ˗ PLB ˗040) S.N. (NUNHM) .

Diagnosis. A small species with orange pronotum and very dark brown elytra, immediately distinguished by the emargination of the elytral apex in the male.

Remarks. Jeng et al. (2003b: 251) recorded this species could emit light through their three segmented LOs. It is unlikely that the LO exists in more than ventrites 6 and 7. Many Luciolinae having dark coloured ventrites anterior to the LO in V6 also have pale coloured V5 which would appear to illuminate when the LO is flashing. On live specimens Fu only observed luminosity through V6 and 7 (X H Fu pers. comm.) and his illustrations of the ventral surface reveal sparse pale markings on the posterior surface of V5 only (Fu 2014: 29). Chen’s (2003) Luciola sp. 2 on page 167 is L. trilucida (Jeng pers. comm).