Thespea aka N. Singh & Ahmad, sp. nov.

(Figs 1, 2, 12, 13)

Type material. Holotype, male. India, Arunachal Pradesh, W[est] Kameng, Bhalukpong, 21.vi.2018, leg. Rajesh Lenka & Party (E 092035 ’26.2” N 27004 ’18.5” altitude, 168 m) (NZCZSI, Reg. no. 7000/H10).

Paratype. 1 ♂, same data as holotype (NZCZSI, Reg. no. 7001/ H10).

Diagnosis. Morphologically, T. aka, sp. nov. (Figs 1, 2) is similar to T. heringi Solovyev, 2014 (Fig. 3) but is recognizable by the lighter hindwings. In male genitalia, T. aka, sp. nov. (Figs 12, 13) differs from T. heringi (Fig. 14) by the saccular process of valva apically bifurcated and with the ventral edge having series of small teeth (whereas in T. heringi, the apex of saccular process is three-pointed and has smooth edges). Another related species, though distinct externally, is T. siniaevi Solovyev, 2014 (Figs 4, 15) distributed in Northern Myanmar. However, in T. siniaevi, the saccular process is not bifurcated bearing a distinct and curved spine at the apex of dorsal edge.

Description. Forewing length 13 mm. Male (Figs 1, 2): frons and vertex green, former with a basal dark brown band; labial palpus dark brown, antenna dark brown but with paler rami; thorax green dorsally; forewing green dorsally, paler ventrally, costa and cilia dark brown, submarginal series of dark brown elongated spots, a subbasal patch of brown scales on the paler region of inner area; hindwing dorsally yellowish brown, cilia dark brown, inner area with elongated patch of scattered brown scales, ventrally concolorous; pectus and legs covered with dark brown scales; abdomen yellowish brown.

Male genitalia (Figs 12, 13) with uncus broad, tapering apically, apex with a pointed spur; gnathos upwardly curved, gradually tapering, reaching half the length of uncus; tegumen broad; valva rhomboidal; saccular process broad, approximately rectangular and flap-like, apically bifurcated, bearing a series of small teeth on ventral edge; costal process membranous, narrowing to a rounded apex; aedeagus constricted medially, with a large, subapical process; vesica with a long row of compactly arranged small claw shaped cornuti.

Female unknown.

Distribution. West Kameng, Arunachal Pradesh, India.

Etymology. The name of the new species is derived from a tribe called Aka living in the West Kameng district of Arunachal Pradesh, India.