Arotes japonicus Ito & Watanabe

Ito, Masato, Watanabe, Kyohei & Maeto, Kaoru, 2014, Revision of the genus Arotes Gravenhorst (Hymenoptera: Ichneumonidae: Acaenitinae) from Japan, Zootaxa 3893 (2), pp. 196-208 : 199-203

Arotes japonicus Ito & Watanabe , sp. nov.

( Figs 1 , 4 , 7 , 10 , 17–18 )

Type series. Holotype: F, “Mae, Yamae-mura, Kumamoto Pref., Japan, 22. August 2012, R. Matsumoto leg.” ( OMNH).

Paratypes: Japan. 1F, Hitsujigaoka, Sapporo-shi, Hokkaido Pref., 25. July-1. August 2011 K. Konishi (MsT) ( NSMT); 2F, same locality, 1–8. August 2011, K. Konishi (MsT) (EUM) [Ajpn]; 1F, Jogi, Sendai-shi, Miyagi Pref., 19. September 2001, R. Matsumoto ( OMNH); 1F, Hinoemata-mura, Fukushima Pref. 19. July–1. August 2004, H. Makihara (MsT) ( KPMNH); 1F, Ohkawa-rindou, Nasushiobara-shi, Tochigi Pref., 11–25. August 2010, T. Nakayama (MsT) ( KPMNH); 1F, same date as holotype; 1F, Mt. Ibukiyama, Ino-cho, Kochi Pref., 13. August 1998, R. Matsumoto ( OMNH).

Female (n=9). Body length: 9.5–13.0 mm.

Head. Clypeus 0.5 times as long as wide. Face 0.7–0.8 times as long as wide, strongly striate, sparsely punctate and weakly convex. MSL 0.8–0.9 times as long as BWM. Lower tooth of mandible slightly longer than upper tooth ( Fig. 1 ). OOL/OD= 1.1–1.4. POL/OD= 0.9–1.4. Antenna with 32–35 flagellomeres; first flagellomere 1.2–1.4 times as long as second flagellomere.

Mesosoma. Lateral area of pronotum punctate and longitudinally striate. Lateral part of collar weakly punctate dorsally. Subalar prominence strongly striate. Metapleuron extensively punctate to rugose-punctate ( Fig. 4 ). Fore wing: length 8.6–11.0 mm. Fore wing with vein rs-m cross-vein distad of vein 2 m-cu ( Fig. 10 ). Hind femur 3.3–3.5 times as long as maximum depth in lateral view. Hind tibia 9.4–11.3 times as long as maximum depth in lateral view. Hind first tarsomere 2.2–2.7 times as long as second hind tarsomere and 3.0–3.4 times as long as longer hind tibial spur.

Metasoma. T1 1.8–2.1 times as long as maximum width, 2.0–2.2 times as long as T2, sparsely punctate. T2 0.5–0.7 times as long as maximum width. T2 and other tergites densely punctate. Ovipositor sheath 1.9–2.0 times as long as hind tibia.

Coloration. Body black ( Figs 17–18 ). Antennal flagellum with a white band. Inner margin of eye white, sometimes spread to frontal orbit. Front and middle legs tinged with whitish yellow. Fore wing with a vague black spot on apical margin ( Fig. 10 ).

Male. Unknown.

Distribution. Japan (Hokkaido, Honshu, Shikoku and Kyushu).

Remarks. In the key provided by Castillo et al. (2011), the newly described species keys to A. maurus Rohwer from the U.S. A and Canada or A. odonatus Uchida from Far East Russia; however, it can be distinguished from them by the entirely black hind tibia (the basal half of the hind tibia is light colored in A. maurus and A. odonatus ). It is also easily distinguished from other Japanese Arotes by the following combination of character states: body entirely black ( Figs 17–18 ), fore wing vaguely infuscate on apical margin ( Fig. 10 ), and metapleuron extensively punctate to rugose-punctate ( Fig. 4 ).

Insertion of A. japonicus sp. nov. in the key to the world’s species of Arotes (after Castillo et al. 2011)

5(4) Hind femur predominantly orange-red............................... A. ustulatus Kriechbaumer (western Palaearctic) - Hind femur predominantly black or dark brown............................................................. 6’ 6’ Hind tibia entirely black ( Figs 17–18 ).............................. A. japonicus sp. nov. (eastern Palaearctic: Japan) - Hind tibia orange to orange-brown, or pale yellow or ivory in basal half......................................... 6 6(5) Hind tibia orange to orange-brown in basal half.............................. A. odonatus Uchida (eastern Palaearctic) - Hind tibia pale yellow or ivory in basal half.......................................... A. maurus Rohwer (Nearctic)

Figures

FIGURES 1 – 3. Head, frontal view. 1, A. japonicus sp. nov., female (holotype); 2, A. moiwanus, female (Hokkaido); 3, A. sugiharai, female (Nagasaki Pref.).

FIGURES 4 – 6. Metapleuron, propodeum and 1 st metasomal segment, lateral view. 4, A. japonicus sp. nov., female (holotype); 5, A. moiwanus, female (Hokkaido); 6, A. sugiharai, female (Nagasaki Pref.).

FIGURES 7 – 9. Anterior aspect of hind leg. 7, A. japonicus sp. nov., female (holotype); 8, A. moiwanus, female (Hokkaido); 9, A. sugiharai, female (Nagasaki Pref.).

FIGURES 10 – 12. Wings. 10, A. japonicus sp. nov., female (paratype, Kumamoto Pref.); 11, A. moiwanus, female (Yamanashi Pref.); 12, A. sugiharai, female (Yamanashi Pref.).

FIGURES 17 – 18. A. japonicus sp. nov., female (holotype). 17, lateral view; 18, dorsal view.