The supertribe Euplectitae includes 8 tribes and 385 genera in the world (Bouchard et al., 2011), but only single genus and species, Philoscotus coreanusNomura and Lee, 1993, is recorded in Korea. The genus Philoscotus Sawada may be separated from other Euplectitae genera by narrowed head and prothorax, well-developed paratergites, and extremely reduced or absent female eyes and hind wings. This genus is similar externally with the genus Acetalius, but it can be easily distinguished by having paratergites. In this paper, Philoscotus rostralis Nomura is recorded in Korea for the first time. Illustrations of a habitus, diagnostic characters and distribution map are provided.

Materials and Methods

Thirty specimens were examined from the Chungbuk National University Insect Collection (CBNUIC), Cheongju-si, Chungbuk-do, South Korea, and the Chungnam National University Insect Collection (CNUIC), Daejeon, South Korea (indicated parenthetically). The picture of habitus and diagnostic characters were observed by LEICA M80 microscope and DM1000 LED optical microscope, respectively. Images were taken using Las V4.12 and Zerene Stacker software to take multi-focus images. The map is created from SimpleMappr and was subsequently modified to mark localities.

Systematic accounts

Genus PhiloscotusK. Sawada, 1957 옆배개미사돈속

Type species Philoscotus longulusK. Sawada, 1957

TyphlacetaliusJeannel, 1959: 17. Type species Typhlacetalius coiffaitiJeannel, 1959 (= Philoscotus brevisK. Sawada, 1957)

Philoscotus rostralisNomura, 1988 긴턱옆배개미사돈(신칭) (Figs. 1, 2)

Philoscotus rostralisNomura, 1988: 746; Nomura and Lee, 1993: 3; Kurbatov, 2007: 294.

Diagnosis. Body reddish brown to yellowish brown (Fig. 1A and B). Head and pronotum strongly narrowed than abdomen (Fig. 1A and B). Male with large convex eye (Fig. 1H), female absent (Fig. 1I). Antennomeres 1-2 rectangular, and 11 extremely enlarged with many setae (Fig. 1A and B). Pronotum longer than wide (Fig. 1A and B). Elytra many setae and three foveae on each elytron. Male hind wing well-developed, female extremely reduced. Male abdominal sternite IX with a pair of lobes (Fig. 1D, red arrows), X triangular (Fig. 1E). Male genitalia bulb-shape (Fig. 1F).

Materials examined.Korea: Jeonnam Prov.: 2♂, Gurim-ri, Samsan-myeon, Haenam-gun, 19.V.2019. 34°29'42.7"N 126° 37'38.8"E, 147 m. leaf litter & Deadwood debris, Ji-Won Kang (CBNUIC); Chungnam Prov.: 4♂, Geumsan-Gun, 21V-10Ⅵ 2006, FIT (CNUIC); 20♂, Gongju-City, Mt. Gyeryonsan, Donghaksa, N 36°21'17.4" E 127°14'55.7", 1.VI.-18.VI.2004, SM Choi, JS Park. ex FIT (CNUIC); 2♀, Oncheon-ri, Banpo-myeon, Gongju-si, 3.V.2019, 36°22'15.1"N 127°15'57.8"E 120 m, Leaf litter, JW Kang, YJ Choi, JS Park, Deadwood debris sifting near stream (CBNUIC); Gangwon Prov.: 2♂, Jeongseon-gun, Jeongseon-eup, Mt. Gariwangsan recreation forest, N37°24'54" E128°32'10.1", 26.V.-12.VI.2009, TK Kim, YH Kim, JH Song, SG Lee, ex FIT (CNUIC).

Distribution. Korea (Fig. 2), Japan.

Remarks.Philoscotus rostralis is known as a predator of small creatures in soil habitats, but specific biology is unknown. This species can be separated from the other Korean Philoscotus species, P. coreanus Nomura and Lee, by longer head length and a pair of lobes of male abdominal sternite IX. Specimens of this species were collected using flight intercept traps (FIT), or by sifting leaf, wood debris near stream. Female specimens were not collected by FIT because of lacking the ability to fly by extremely reduced hind wing.