Orussidae

Choi, Jin-Kyung, Wei, Meicai, Vilhelmsen, Lars & Lee, Jong-Wook, 2014, A new Orussus species from South Korea, and a key to the East Asian Orussidae (Hymenoptera), Zootaxa 3873 (3), pp. 250-258 : 253-254

Key to species of Orussidae from the eastern Palaearctic

Species from southern China are also included. Vilhelmsen et al. (2014) regarded O. mikagei Togashi, 2008 as a junior synonym of O. rufipes Tsuneki, 1963 . For a complete key to the world’s species of Orussus , see Vilhelmsen et al. (2014).

1. Frons with area delimited by lateral longitudinal frontal carinae and dorsal as well as ventral transverse frontal carinae ( Fig. 4 A). Combined length of antennomeres 4+5 longer than antennomere 6 ( Fig. 4 B). Mesoscutellum with lateral margin indistinct, not raised relative to adjacent sclerites, and posterior margin broadly parallel with anterior margin of metanotum. Vein 2r of fore wing arising from pterostigma about 0.6–0.7 from base of latter ( Fig. 4 C)....................... Ophrynopus ...2

- Frons without dorsal transverse frontal carina and longitudinal frontal carinae ( Fig. 1 B). Combined length of antennomeres 4+5 equal or shorter than antennomere 6 ( Fig. 1 B). Mesoscutellum with distinct lateral margins, raised relative to surrounding sclerites, posterior margin triangular or rounded, but not broadly parallel with anterior margin of metanotum. Vein 2r of fore wing arising from middle of pterostigma ( Fig. 2 F)................................................... Orussus …3

2. Apical half of forewing entirely infuscate, stigma of forewing dark brown ( Fig. 4 in Togashi 2000). Apical projection of abdominal sternum 9 in male clearly longer than broad (Fig. 10 in Togashi 2000). Japan (Honshu)............................................................................................ Ophrynopus apicalis ( Togashi, 2000)

- Apical 0.2 of forewing clear, stigma of forewing largely white ( Fig. 4 C). Apical projection of abdominal sternum 9 in male shorter than broad (Fig. 14 in Togashi 2000). South Korea, Japan (Shikoku, Honshu, Yakushima, Tanegashima)....................................................................... Ophrynopus tosensis (Tosawa & Suigihara, 1934)

3. Forewing entirely hyaline, without infuscated band. Mesopleuron with vertical carina anterolaterally (mesepisternal carina). China (Hainan), Japan (Ryukyu Islands).............................................. Orussus striatus Maa, 1950

- Forewing with at least one infuscate transverse band. Mesepisternal carina absent................................... 4

4. Abdominal tergite 2 with a large white spot anterolaterally on each side. Japan (Hokkaido, Honshu, Shikoku)....................................................................................... Orussus japonicus Tosawa, 1930

- Abdominal tergite 2 without white spot.................................................................... 5

5. Frons with distinct white spots along inner margin of eyes; antennomeres 3–4 with yellow-white spot or stripe dorsally. Apical half of forewing distinctly infuscate with a pale macula just beyond apex of pterostigma which is not extending to posterior margin of wing, narrow apical margin of forewing distinctly hyaline, not infuscate. Legs largely black. Abdominal terga 3–7 red or reddish brown................................................................................... 6

- Frons without distinct white spots; antennomeres black, if rarely antennomeres 4–5 pale brown dorsally, then legs largely orange. Apical 0.3 of forewing distinctly infuscate toward extreme apex, hyaline band beyond pterostigma extending to posterior margin of wing ( Fig. 2 F). Abdominal segments of uniform color, dark brown to black............................ 7

6. Hyaline spot outside of pterostigma extending to apex of cell 1Rs, apical hyaline band of fore wing broad, about as long as length of pterostigma. Tergum 8 more or less reddish brown. Antennomeres 4–5 yellow- white dorsally. Northeastern China ( Vilhelmsen et al. 2014), Turkey, Iran, Central Asia ( Kazakhstan), Primorskij and Chabarowskij kray (E-Russia), and North Korea ( Vilhelmsen 2003 and Blank et al. 2006), Saghalien of Russia, Europe........... Orussus abietinus (Scopoli, 1763)

- Hyaline spot outside of pterostigma not extending to apex of cell 1Rs, apical hyaline band of fore wing narrower than half length of pterostigma. Tergum 8 black. Antennomere 4 with a small white spot dorsally, antennomere 5 entirely black. North and South Korea........................................................... Orussus coreanus Takeuchi, 1938

7. Femora black except a white spot near apex. Tibia black with white stripe. Tarsus black.............................. 8

- Femora red or reddish brown except a white spot near apex. Tibia reddish brown with white stripe. Tarsus reddish brown or infuscate............................................................................................ 9

8. Basal half of forewing clearly infuscate, not distinctly paler toward base. Dorsal white stripe on hind tibia less than 0.3 times tibial length. Center of mesoscutellum sparsely punctured, interspaces shiny. Lateral ocellus situated between level of second and third tubercles. China ( Taiwan................................... Orussus brunneus Shinohara & Smith, 1983

- Basal half of forewing infuscate but distinctly paler toward base. Dorsal white stripe on hind tibia in female about 0.5 times tibial length. Mesoscutellum densely punctured except margins. Lateral ocellus situated between level of third and fourth

tubercles. South Korea............................................... Orussus melanosoma Lee & Wei , sp. nov. 9. Antennomeres 4–5 pale brown dorsally. Frons irregularly areolate-rugose (Fig. 58 in Vilhelmsen et al. 2014). Mesoscutellum triangular posteriorly, densely punctate, punctures smaller than on mesoscutum, interspaces mostly carinate (Fig. 61 in Vilhelmsen et al. 2013). White stripe on dorsal side of hind tibia 0.3–0.5 times length of tibia. Hind tarsus black brown. China (Hunan).................................................. Orussus zhui Vilhelmsen, Liu, Smith & Blank, 2013

- Antennomeres 4–5 entirely black. Frons regularly areolate-rugose (Figs 38, 46 in Vilhelmsen et al. 2014). Mesoscutellum triangular or narrowly rounded posteriorly, punctate laterally and posteriorly, punctures partly larger than punctures on mesoscutum. White stripe on dorsal side of hind tibia 0.1–0.4 times length of tibia. Hind tarsus dark reddish. Japan (Honshu, Hokkaido, Kyushu)..................................................................... Orussus rufipes Tsuneki, 1963

Figures

FIGURE 1. Orussus melanosoma Lee & Wei sp. nov., female: (A) habitus in dorsal view, (B) head in frontal view, (C) head in dorsal view. Scale bar (A): 1 mm, (B – C): 0.2 mm.

FIGURE 2. Orussus melanosoma Lee & Wei sp. nov., female: (A) head in lateral view, (B) mesoscutum and mesoscutellum, (C) hind tibia, (D) ovipositor, (E) abdomen in dorsal view. Scale bar: (D – F): 0.5 mm, (A – C): 0.2 mm. * d: discal cell, P: pterostigma.

FIGURE 4. Ophrynopus tosensis (Tosawa & Sugihara, 1934), female: (A) head in frontal view, (B) antenna, (C) fore wing. Scale bar: (C): 0.5 mm, (A – B): 0.2 mm.