South Korea, Gangwon-Prov., Pyeongchang-Gun, Mt. Odaesan.

Holotype , ♂ (NIBR): KOREA, Gangwon-Prov. Pyeongchang-Gun, Mt. Odaesan, 22. vii. 2004, S.-J. Park leg. Paratypes, 2♂ 1♀ (NIBR): 16. v. 2005, same data as holotype except for the date; 1♂ (NIBR): 21. ix. 2006, same data as holotype except for the date.

Body length approximately 1.3–1.4 mm. Dorsum almost concolorous, brown, or dark brown. Head and pronotum strongly microreticulate, sparsely and very minutely punctate. Elytra almost smooth, sparsely and very minutely punctate, and densely and transversely strigose. The median lobe of aedeagus relatively thick and feebly curved at lateral margins and bearing a relatively small nipple at apex in dorsal view.

Measurement of holotype. Body length: 1.39 mm; head length: 0.26 mm, width: 0.39 mm; pronotum length: 0.45 mm, width: 0.83 mm; elytron length: 0.81 mm, width: 0.83 mm.

Coloration. Dorsum of body shiny and almost concolorous, brown or dark brown; antennae light brown; mesoventrite brown or dark reddish brown with a black median carina; metaventrite brown or dark reddish brown with a dark brown median carina; abdominal ventrites brown or dark reddish brown; legs brown with light brown tarsi.

Body 1.31–1.39 mm in length, approximately 1.8 times as long as wide (Fig. 1).

Head approximately 1.6 times as wide as long, strongly microreticulate, sparsely and very minutely punctate; head length approximately 0.54 times pronotum length; head width approximately 0.48 times pronotum width; antennomeres 1–4 and 11 longer than wide; antennomere 5–7 almost as long as wide; other antennomeres wider than long; antennomere 11 approximately1.3 times as long as wide (Fig. 3).

Pronotum approximately 1.8 times as wide as long, strongly microreticulate, sparsely and very minutely punctate; pronotum length approximately 0.58 times elytron length; pronotum width almost same as elytron width.

Scutellum weakly microreticulate and almost impunctate or sparsely and very minutely punctate.

Elytra almost as long as wide or slightly wider than long, widest at approximately basal 1/6, almost smooth, sparsely and very minutely punctate, and densely and transversely strigose (Fig. 6).

Legs show no sexual dimorphism on protarsi and normal shape for Typhlocolenis.

Meso- and metaventrites strongly microreticulate, almost impunctate, and glabrous; abdominal ventrites strongly microreticulate, almost impunctate, and bearing sparse and very fine pubescences.

Male. Aedeagus generally thick (Figs 7, 8); median lobe of aedeagus feebly curved at lateral margins and bearing a relatively small nipple at apex in dorsal view (Fig. 7) and weakly curved in lateral view (Fig. 8); parameres almost symmetrical and bearing several apical setae (Figs 7, 8).

Female. Spermatheca generally crescent shaped (Fig. 13).

The specific name is derived from an ancient Korean kingdom, Silla, where is the type locality of the present new species.

South Korea (Gangwon-Prov.) (Fig. 15).

The genus Typhlocolenis is here first recorded in South Korea and is the only blind genus in the Korean Pseudoliodini. Therefore, T. sillaensis sp. nov. can be easily separated from Dermatohomoeus Hlisnikovský, 1963 and Pseudcolenis Reitter, 1885 of the tribe by the lack of eyes. Moreover, T. sillaensis sp. nov. can be distinguished from Dermatohomoeus and Pseudcolenis by having a metaventrite with a distinct median carina. In contrast, Dermatohomoeus and Pseudcolenis have no median carinae on the metaventrites.

Typhlocolenis sillaensis sp. nov. is similar to T. fusca Hoshina, 2008 in appearance but can be distinguished by the relatively thick median lobe of aedeagus (Fig. 7) that has a relatively small nipple at the apex in dorsal view (Fig. 7). In contrast, T. fusca has a relatively slender median lobe that has a relatively large nipple at the apex in dorsal view (Fig. 11).

The life history of Typhlocolenis sillaensis Hoshina & Park, sp. nov. is not known.

South Korea, Jejudo Is., Jeju-City, Goepyeongioreum

Holotype , ♂ (NIBR): KOREA, Jejudo Is., Jeju-City, Goepyeongioreum, 13. vi. 2005, S.-I. Lee leg. Paratypes, 3♀ (NIBR): same data as holotype; 1♂ 5♀ (NIBR): Jejudo Is., Jeju-City, Bijarium, 12. vi. 2005, S.-J. Park leg.; 2♂ 2♀ (NIBR): Jejudo Is., Jeju-City, Dongbaekdongsan, 13. vi. 2005, S.-I. Lee leg.; 2 exs. (NBIR): Jejudo Is., Jeju-City, Dongbaekdongsan, 22. v. 2006, S.-I. Lee & Y.-H. Kim leg.

The present species very similar to Typhlocolenis sillaensis Hoshina & Park, sp. nov. Body length approximately 1.3–1.4 mm. Dorsum almost concolorous, brown to blackish brown. Head and pronotum strongly microreticulate, sparsely and very minutely punctate. Elytra almost smooth, sparsely and very minutely punctate, and densely and transversely strigose. The median lobe of aedeagus relatively thick, strongly expanded at about middle of lateral margins, and bearing a small nipple at apex in dorsal view.

Measurement of holotype. Body length: 1.30 mm; head length: 0.24 mm, width: 0.35 mm; pronotum length: 0.40 mm, width: 0.71 mm; elytron length: 0.73 mm, width: 0.73 mm.

Coloration. Dorsum of body shiny and almost concolorous, brown to blackish brown; mesoventrite brown or dark reddish brown with a black median carina; metaventrite brown or dark reddish brown with a dark brown median carina; abdominal ventrites brown or dark reddish brown; legs brown with light brown tarsi.

Body 1.28–1.42 mm in length, approximately 1.7 times as long as wide (Fig. 2).

Head approximately 1.5 times as wide as long, strongly microreticulate, sparsely and very minutely punctate; head length approximately 0.61 times pronotum length; head width approximately 0.48 times pronotum width; antennomeres 1–4 and 11 longer than wide; antennomere 5–7 almost as long as wide; other antennomeres wider than long; antennomere 11 approximately 1.3 times as long as wide (Fig. 4).

Pronotum approximately 1.8 times as wide as long, strongly microreticulate, sparsely and very minutely punctate; pronotum length approximately 0.52 times elytron length; pronotum width almost same as or slightly narrower than elytron width.

Scutellum weakly microreticulate and almost impunctate or sparsely and very minutely punctate.

Elytra almost as long as or slightly longer than wide, widest at approximately basal 1/6, almost smooth, sparsely and very minutely punctate, and densely and transversely strigose (Fig. 6).

Legs show no sexual dimorphism on protarsi and normal shape for Typhlocolenis.

Meso- and metaventrites strongly microreticulate, almost impunctate, and glabrous; abdominal ventrites strongly microreticulate, almost impunctate, and bearing sparse and very fine pubescence.

Male. Aedeagus generally thick (Figs 9, 10); median lobe of aedeagus strongly expanded at about middle of lateral margins, and bearing a small nipple at apex in dorsal view (Fig. 9), slightly, and weakly curved in lateral view (Fig. 10); parameres almost symmetrical and bearing several apical setae (Figs 9, 10).

Female. Spermatheca generally C-shaped (Fig. 14).

The specific name is derived from the type locality, Jejudo Island.

South Korea (Jejudo Island) (Fig. 15).

Typhlocolenis jejudoensis sp. nov. is similar to T. sillaensis sp. nov. in appearance but can be distinguished by being strongly expanded at about middle of lateral margins in dorsal view (Fig. 9). In contrast, T. sillaensis sp. nov. has a very feebly curved median lobe in dorsal view (Fig. 7).

Moreover, T. jejudoensis sp. nov. resembles T. furunoi Hoshina, 2008 in appearance but can be distinguished by median lobe of aedeagus with a small nipple at the apex in dorsal view (Fig. 9). In contrast, T. furunoi has a median lobe broadly rounded at the apex (Fig. 12).

The life history of Typhlocolenis jejudoensis Hoshina & Park, sp. nov. is not known.