Elasmostethus humeralis Jakovlev, 1883

Elasmostethus humeralis Jakovlev View in CoL

( figs. 5, 17-18, 24, 31, 37)

Elasmostethus humeralis Jakovlev, 1883: 15 ; Hasegawa, 1958: 6; Miyamoto & Yasunaga, 1989: 188.

Elasmostethus matsumurae Horváth, 1899: 366 , synonymized by Horváth, 1907: 299.

Redescription. – Body ovoid, rather slender; dorsal surface green with red markings, densely dark punctate; ventral surface greenish yellow, reddish on posterior end. Head green, irregularly punctate except around eyes and with a pair of fuscous, narrow stripes on basal part of tylus. Antenna green, with brownish segment III, fuscous IV and apical ⅔ of V. Rostrum greenish yellow with fuscous apex, reaching to middle coxae. Pronotum green, densely punctate except for calli; humeral angle triangularly projected, infuscate posteriorly. Scutellum green, tinged with red basally, densely punctate; apex pale, impunctate. Corium translucent, green, with some red along claval and membranal margin, densely punctate; base of vein R+M narrowly blackish; apical corner slightly infuscate; clavus red, densely punctate; membrane hyaline, with a triangular, fuscous marking at middle of costal margin. Femur greenish yellow, slightly darkened apically and with a small basal tubercle in male; tibia green, brownish apically; tarsus brown, darkened on apex of tarsomere II; apex of claw fuscous. Abdominal terga I- IV black with greenish yellow lateral margin; V-VII entirely yellow with red tinge. Connexiva greenish yellow, reddish on apex of segment VII. Sterna greenish yellow, impunctate; each segment with a pair of fuscous spots laterally; apical corner of segment VII strongly acute, reddish. Pendergrast’s organs on abdominal sternum VI remarkably reduced ( fig. 37).

Male genitalia: Sides of genital capsule nearly straight in dorsal view; ventral rim projecting medially, furnished with a pair of lower tufts and a pair of upper tufts, lateral teeth lacking; infolding of dorsal rim with a pair of long setal tufts at each side of middle ( figs. 17-18); paramere strongly broadened apically and with broad triangular outer projection weakly reflexed caudad ( fig. 24); phallotheca with a large dorsal diverticulum; dorsal lobe of conjunctival sheath developed, inflated basally, with two small lobes at subbasal part and middle part ( fig. 31).

Female genitalia: Genital segments somewhat flattened; posterior margin of genital segments VIII nearly straight, rounded laterally and with a weak median emargination ( fig. 37).

Dimensions. – 3/ ♀: Body length 10.01-11.47 (10.79)/9.96-11.74 (11.00); width of head including eyes 1.73-1.86 (1.81)/1.76-1.93 (1.86); length of antennal segment I: 0.90-1.04 (0.95)/0.83-0.93 (0.88), II 1.24-1.69 (1.44)/1.21-1.52 (1.36), III 1.10-1.31 (1.25)/1.10-1.24 (1.16), IV 1.52-1.86 (1.70)/1.45- 1.73 (1.59), V 1.31-1.59 (1.44)/1.21-1.45 (1.33); width of pronotum 4.73-5.66 (5.11)/4.90-5.93 (5.51); width of scutellum 2.62-3.04 (2.74)/2.69-3.24 (2.99); length of scutellum 3.04-3.66 (3.37) /3.14-3.93 (3.59); length of fore femur 2.07-2.48 (2.31)/1.83- 2.52 (2.27), fore tibia 2.21-2.48 (2.35)/ 1.73-2.45 (2.24), middle femur 2.42-2.90 (2.65)/ 2.45-2.90 (2.69), middle tibia 2.42-2.76 (2.57)/2.35-2.79 (2.58), hind femur 3.11-3.73 (3.39)/2.97-3.55 (3.27), hind tibia 2.76-3.93 (3.55)/3.04-3.66 (3.32).

Distribution. – Japan (Hokkaido, Honshu, Shikoku, Kyushu, Rishiri Is., Rebun Is., Oki Is.); China, Korea, Russian Far East (southern Khabarovsk, Primorski, Sakhalin, Kurils).

Biology. – This species is known to feed on many species of Umbelliferae and Araliaceae . I have confirmed the following host plants in Japan: Angelica ursina (Rupr.) , Angelica edulis Miyabe , Heracleum dulce Fisch. (Umbelliferae) ; Kalopanax pictus (Thunb.) , Hedera rhombea (Miq.) and Aralia cordata Thunb. ( Araliaceae ). This species occurs in Japan from lowland to the montane zone.

Remarks. – This species can easily be recognized by the reddish yellow abdominal terga under the wings, small Pendergrast’s organs on abdominal segment VI ( fig. 37), the shape of the paramere ( fig. 24), and the nearly straight posterior margin of the female genitalia ( fig. 37).

Material examined. – JAPAN: Hokkaido: 13, Rebun Is. , 26.vii.1951, M. Konishi ( SEHU) ; 1♀, Tokachi-Mitsumata , Kamishihoro, 24.vii.1994, A. Yamamoto ; 23, Meto , Ashoro, 25.iv.1990, K. Haga ( OMO) ; 13, Kami-muri , Maruseppu, 24.vii.2000, Y. Kida ; 13 2♀, from Simo-futamata to Kamifutamata, Mt. Shari-dake , Kiyosato, 17.vii.2001, Y. Kida ( MTIM) ; 2♀, Bettoga , Nemuro, 26.vii.1992, N. Muramatsu ( KRMK) ; 13 1♀, Butokamabetsu-gawa , Horokanai, 18.vi.1995, A. Yamamoto ; 63 6♀, Hokkaido Univ ., Sapporo, 15.ix.1993, A. Yamamoto ; 2♀, Anataki , Otaru, 12.v.1998, A. Yamamoto ; 1♀, Uendomari , Iwanai, 18- 20.viii.1997, A. Yamamoto ( OMO) ; 13, Mt. Yotei-zan , 27.v.1992, S. Kudo ; 13, Shikotsu-ko , Chitose, 24.vi.1986, M. Ohara ( SEHU) ; 163 3♀, Apoi-dake , Samani, 25.v.1996, K. Sugishima ; 23, Ainuma, Kumaishi , 8.vi.1996, K. Mizota ; 33, Haraguchi , Matsumae, 7.vi.1996, K. Mizota ( OMO) ; 63 1♀, Shiriuchi , 20.vi.1976, T. Kumata et al. ( SEHU) . – Honshu: 23 2♀, Ajigasawa , Aomori Pref., 26.vii.1988, K. Shimoyama ( APMA) ; 2♀, Yoshibe-zawa , Kawai, Iwate Pref., 11.x.1995, A. Yamamoto ; 13, Ouchi , Shimogo, Fukushima Pref., 13.vi.1999, K. Haga ( OMO) ; 13, Mt. Jinba-yama , Hachioji, Tokyo Metrop., 8.x.1967, H. Takizawa ( SEHU) ; 13, Mitsumata , Horigane, Nagano Pref., 14.ix.1995, A. Yamamoto ; 23, Hirugano , Takasu, Gifu Pref., 12.ix.1995, A. Yamamoto ; 1♀, Okoyama , Susono, Shizuoka Pref., 30.x.1998, G. Ito ; 73 4♀, Mt. Hirasan , Otsu, Shiga Pref., 10.ix.1995, A. Yamamoto ; 2♀, Ashiu , Miyama, Kyoto Pref., 9.ix.1995, A. Yamamoto ( OMO) . – Kyushu: 1♀, Mt. Hakucho-zan , Izumi, Kumamoto Pref., 7.viii.1988, T. Yasunaga ( OMO) . – CHINA: 13, Chilin , 2.viii.1928 ( NUT) .