Nebria (Falcinebria) dichotoma sp. nov. Figs 14, 31, 32 Japanese name: Dando-hime-marukubi-gomimushi

Nebria reflexa: Uéno (1985): 56 (part); Nakane (1963b): 19 (part).

Notes.

This species is known only from the type locality, Mount Takanosu. Among known related species, it is similar to N. chugokuensis sp. nov. in having a relatively large-sized body and larger PPW/EL but is distinguished by a lack of concavity on the ventral surface of the aedeagal apex.

Description.

Body length: ♂, 9.80-10.34 mm (mean ± SD: 10.14 ± 0.22 mm, n = 5); ♀, 10.49-11.12 mm (mean ± SD: 10.79 ± 0.30 mm, n = 6). PPW/EL: ♂, 0.314-0.335 (mean ± SD: 0.322 ± 0.010, n = 5); ♀, 0.302-0.324 (mean ± SD: 0.312 ± 0.008, n = 6). Ventral surface of aedeagal apex not concave. Dorsobasal lobe absent. Dorsomedian lobe small, directed right-laterally. Dorsoapical lobe with two small protrusions at the basal part; the apical portion directed ventrally, bifurcated in a Y-shape. Right laterobasal lobe large, with the width from a ventral view wider than the width of the gonopore protrusion from a lateral view. Left laterobasal lobe large, with the width from a ventral view wider than the width of the gonopore protrusion from a lateral view. Right lateroapical lobe bifurcated at the base in a V shape, with one apex directed posterolaterally and the other directed anterolaterally; the posterolateral apex very small; the anterolateral apex smaller than right laterobasal lobe. Left lateroapical lobe bifurcated at the middle in a Y shape, with one apex directed posterolaterally and the other directed anterolaterally; the posterolateral apex smaller than the anterolateral apex; the anterolateral apex smaller than the right laterobasal lobe. Ventrobasal surface with a pair of swelling adjoining each laterobasal lobe; swellings conjoined; ventrobasal swelling absent.

Type materials.

Holotype: ♂ (NARO), Mount Takanosu (= Mount Dando), alt. 1000 m, Shitara-machi, Aichi Prefecture, Japan, 8.vi.1971, K. Tanaka & H. Ohira leg. Paratypes (NARO): 2♂4♀, same data as the holotype; 2♂2♀, same locality and collector (1♂2♀, 24.vi.1972; 1♂, 4.viii.1972).

Etymology.

The specific name derives from the Greek word dichotoma (divided into two) and refers to the apical portion of the dorsoapical lobe.