Dirrhagofarsus lewisi (Fleutiaux, 1900)

Seung, Jinbae, Muona, Jyrki & Lee, Seunghwan, 2018, Taxonomic review of the genus Dirrhagofarsus in Korea (Coleoptera, Eucnemidae), ZooKeys 781, pp. 97-108 : 97

Dirrhagofarsus lewisi (Fleutiaux, 1900) Figure 1

Microrhagus lewisi Fleutiaux, 1900: 358.

Dirrhagus lewisi Fleutiaux, 1923: 308.

Dirrhagofarsus lewisi Fleutiaux, 1935: 16.

Diagnosis.

Body: mostly coloured dark brown. Head: frons simple, without medio-longitudinal carina; anterior edge of frontoclypeal region 2.7 × wider than distance between antennal sockets in female; antennomere III 1.3 × longer than IV in female. Pronotum: anterolateral carina one-fifth as long as pronotum; posterolateral carina four-fifths as long as pronotum. Pterothorax: elytra 2.65 × longer than combined width, apices with strongly convex apices in lateral view. Leg: metatarsomere II 1.6 × longer than III, as long as V.

Redescription.

Female (Fig. 1 A–C) 6.1-7.7 mm long and 1.7-2.2 mm wide. Body brown to dark brown; antennae and legs red-brown; surface weakly glossy, covered with yellow-brown pubescence. Head deeply inserted into prothorax, barely visible in dorsal view; surface coarse, with circular, irregularly sized and spaced punctures, more rugose near occiput and frontoclypeal region; frons simple, without medio-longitudinal carina; frontoclypeal region (Fig. 1E) slightly depressed at base, obtusely trilobate at anterior edge, anterior edge 2.7 × wider than distance between antennal sockets. Antennae (Fig. 1D) weakly serrate, almost reaching abdominal ventrite II, with yellow-grey pubescence; antennomere II conical and shortest; antennomere III 2.5 × longer than II, and 1.3 × longer than IV; antennomeres IV–X subequal, slightly shortened apically; antennomere XI 2.9 × longer than wide, and 1.5 × longer than X. Pronotum as long as wide and obtusely arcuate anteriorly; surface with finer, more regularly sized and regularly spaced punctures than on head, especially anteriorly; disc with a medio-longitudinal carina at basal half; anterolateral carina one-fifth as long as pronotum; posterolateral carina four-fifths as long as pronotum; antescutellar lobe obtusely notched; pronotal posterior angles acute, exceeding posterior edge of antescutellar lobe. Scutellum straight anteriorly and evenly arcuate behind anterolateral angles, 1.1 × wider than long; surface rough, sparsely pubescent. Elytra 2.65 × longer than combined width, parallel-sided in dorsal view, and attenuate near apices; disc weakly striate, with shallow, irregularly sized and spaced punctures; several large, deep punctures present near apices; apices strongly convex in lateral view, apices pointed and raised above ventrite V (Fig. 1F). Prosternum wider than long, slightly widened anteriorly; punctures finer and more regularly spaced than on head; prosternal process gradually tapered, and curved dorsally posteriorly; hypomeron with coarse surface, with larger punctures than on prosternum; antennal grooves (Fig. 1H) well-developed, notosternal, parallel-sided, with lateral marginal carina, non-punctate. Mesoventrite with coarse surface. Metaventrite with punctures denser than on prosternum; with a weak median groove along length of metaventrite; metepisternum (Fig. 1I) slightly widened posteriorly, widest part 1.7 × wider than outer edge of metacoxal plate; metacoxal plate (Fig. 1J) medially four × longer than laterally. Legs (Fig. 1G) with metatarsomere II 1.6 × longer than III, as long as V. Abdomen with denser punctures than on metaventrite (Fig. 1K). Male. Not examined.

Specimens examined.

Gyeonggi-Do 1♀, Mt. Bara, Hagui-dong, Uiwang-si, N37°22.34', E127°1.37', 189m alt., light trap, 22 June 2015, J. B. Seung leg. (SNU); Gangwon-Do 1♀, Beopheung-ri, Suju-myeon, Yeongwol-gun, N37°22.69', E128°15.26', 550m alt., flight intercept trap, 03-16 July 2015, leg. Seung and Lee leg. (SNU); 1♀, Seorim-ri, Seo-myeon, Yangyang-gun, N37°56.66', E128°31.17', 292m alt., 09 July 2016, S. H. Lee leg. (SNU); Jeollanam-Do 1♀, Jungdae-ri, Ganjeon-myeon, Gurye-gun, N35°6.44', E127°35.90', 668m alt., flight intercept trap, 04-15 July 2016, Seung and Lee leg. (SNU).

Distribution.

Korea (New record), Japan, Nearctic Region (USA).

Remarks.

A female individual of Dirrhagofarsus lewisi is observed under bark of rotten fallen tree. Additionally, they were rarely collected at light traps. They were observed clicking as well as flying and running.