Elasmostethus rotundus, Yamamoto, 2003

Elasmostethus rotundus View in CoL sp. n.

( figs. 39, 42-43, 45, 47, 50)

Dichobothrium sp. – Hiura et al., 1959: 23, Hasegawa, 1960: 32; Sato, 1998: 386.

Elasmostethus sp. – Ichita, 1991: 120; Higuchi & Sato, 1988: 52.

Type material. – Holotype 3, Nagabashi-naebo , Otaru, Hokkaido, Japan, 12.viii.2001, A. Yamamoto ( SEHU) . – Paratypes: Hokkaido: 13 3♀, same data as for holotype ( OMO) ; 13, Hokkaido Univ ., Sapporo, 22.iv.1964, H. Takizawa ( SEHU) ; 13 2♀, same locality, 24.ix.1993, A. Yamamoto ( OMO) ; 13 3♀, Maruyama , Sapporo, 24.iv.1965, H. Takizawa ( SEHU) ; 13, same locality, vi.1995, A. Yamamoto ( OMO) ; 1♀, Misumai , Sapporo, 24.viii.1990, K. Sayama ; 1♀, same locality, 17.viii.1993, K. Sayama ; 13 2♀, Shiriuchi, 10.viii.1976, T. Kumata et al. ; 13, Fukushima , 12.viii.1976, T. Kumata et al. ; 13 2♀, Kikonai , 10.viii.1976, T. Kumata et al. ( SEHU) . – Honshu: 1♀, Hiyamizu-toge , Higashidori, Aomori Pref., 26.vii.1999, S. Yamauchi ( APMA) ; 1♀, Masakari-domari , Minmaya, Aomori Pref., 23.viii.1987, T. Ichita ( IC) ; 1♀, Ainai , Shiura, Aomori Pref., 24.v.1993, S. Yamauchi ( APMA) ; 13 1♀, Mt. Mano-dake , Aomori, Aomori Pref., 14.viii.1988, T. Ichita ( IC) ; 33 2♀, Mt. Ishikura-dake , Aomori, Aomori Pref., 8.viii.1999, S. Yamauchi ; 1♀, Tamoyachi-zawa , Aomori, Aomori Pref., 8.vi.1997, S. Yamauchi ; 13, Mt. Komaga-mine , Towadako, Aomori Pref., 21.vi.1988, S. Yamauchi ( APMA) ; 1♀, Nagaya-sawa , Kuroishi, Aomori Pref., 25.viii.1987, T. Ichita ( IC) ; 1♀, Ajigasawa , Aomori Pref., 28.vii.1987, A. Abe ; 13, same locality, 23.vii. 1989, A. Fukuda ; 1♀, same locality, 24.vii.1989, A. Fukuda ; 1♀, Juni-ko , Iwaseki, Aomori Pref., 5.viii.1994, S. Yamauchi ( APMA) ; 1♀, Iwate-koen , Morioka, Iwate Pref., 29.iii.1936, H. Ito ; 1♀, Mt. Himegami-yama , Iwate Pref., 5.iv.1936, H. Ito ( NIAS) ; 13, Futakuchi-keikoku , Akiu, Miyagi Pref., 12.vii.1985, K. Konishi et al. ( SEHU) ; 1♀, Sendai , Miyagi Pref., 18.iii.1944, H. Hasegawa ; 13, same locality, 22.viii.1955, S. Katsuya ; 33 3♀, Oga , Akita Pref., 10.ix.1969, T. Kobayashi ; 13 1♀, Tazawa , Akita Pref., 11.viii.1969, T. Kobayashi ; 13, Mt. Akagi , Gunma Pref., 11.viii.1937, S. Nomura ; 1♀, Oneyama , nr. Usui Pass, Gunma Pref., 14.vi.1973, H. Hasegawa ( NIAS) ; 1♀, Mitsumata , Horigane, Nagano Pref., 12.vi.1996, A. Yamamoto ( OMO) ; 1♀, Matsumoto , Nagano Pref., 20.iii.1949, E. Imai ; 1♀, same locality, 26.xii.1949, E. Imai ; 2♀, Nagano Pref., 16.ix.1952, H. Hasegawa ; 23 6♀, Mt. Kiso-ontake , Gifu Pref., 15-16.ix.1953, H. Hasegawa ; 23 2♀, Kibune , Kyoto, Kyoto Pref., 7.ix.1952, E. Nakanishi ( NIAS) . – Kyushu: 1♀, Mt. Sobo , Oita Pref., 30.vii.1951, Takahashi ; 13, Mt. Kirishima , Kagoshima Pref., 31.viii.1929, M. Yano ( NIAS) .

Description. – Body ovoid, rather plump; dorsal surface pale green with red markings, densely dark punctate; ventral surface greenish yellow, reddish on posterior end. Head pale green, with a few small punctures on vertex; basal part of tylus with a pair of fuscous narrow stripes. Antenna pale green, with dark segments IV, V and apical ⅔ of III. Rostrum greenish yellow with fuscous apex, usually reaching hind coxae. Pronotum pale green, densely punctate except for calli; humeral angle slightly projected, broadly infuscate. Scutellum pale green, usually not reddish or fuscous but sometimes with obscure red tinge, densely punctate. Corium translucent, pale green, with some red along claval and membranal margin and with an obscure, fuscous small spot near apex of vein R+M, densely punctate except along vein R+M sparser; apical corner broadly darkened; clavus red, densely punctate; membrane hyaline, with obscure costal and central dark markings. Femur greenish yellow, slightly darkened apically and with a small basal tubercle in male; tibia green, brownish apically; tarsus brown, infuscate on apex of tarsomere II; apex of claw fuscous. Abdominal terga I- II black, III- VII greenish yellow, fuscous or tinged dark red on broad median region. Connexiva greenish yellow, reddish on apex of segment VII. Sterna greenish yellow, impunctate, lacking dark spots but in females often with a pair of fuscous spots on segment VII; apical corner of segment VII usually not extending beyond posterior margin of genital segments; Pendergrast’s organs semicircular ( fig. 47).

Male genitalia: Genital capsule opening dorsoposteriorly; sides nearly straight in dorsal view; ventral rim furnished with a few long setae, lower and upper tufts lacking; dorsal rim with narrowly V- shaped thin protrusion; infolding of dorsal rim broadly covered with short setae; proctiger strongly reflexed apically ( figs. 42-43); paramere broadened apically and projecting triangularly inwards on apical part; outer margin rounded, without distinct apical angle ( fig. 45); phallotheca lacking dorsal diverticulum; conjunctival sheath with reduced dorsal lobe; vesica remarkably inflated, fusiform ( fig. 50).

Female genitalia: Posterior margin of genital segments VIII strongly rounded and scarcely emarginate at middle in ventral view ( fig. 47).

Dimensions. – 3/ ♀: Body length 8.28-9.65 (8.85)/8.01-9.65 (8.91); width of head including eyes 1.52-1.73 (1.61)/1.52-1.73 (1.64); length of antennal segments I 0.62-0.69 (0.66)/0.55-0.69 (0.62), II 1.10- 1.31 (1.21)/0.97-1.24 (1.04), III 0.76-0.90 (0.86)/ 0.76-0.90 (0.81), IV 1.17-1.45 (1.30)/1.17-1.31 (1.22), V 1.04-1.10 (1.08)/0.97-1.17 (1.05); width of pronotum 4.07-4.55 (4.28)/4.14-4.76 (4.50); width of scutellum 2.21-2.55 (2.41)/2.35-2.76 (2.58); length of scutellum 2.69-3.11 (2.88)/2.76-3.24 (3.00); length of fore femur 1.59-2.00 (1.81)/1.59-1.93 (1.79), fore tibia 1.66-2.00 (1.82)/1.59-1.86 (1.70), middle femur 1.73-2.42 (2.09)/1.93-2.28 (2.12), middle tibia 1.86- 2.21 (1.97)/1.73-2.07 (1.92), hind femur 2.35-2.83 (2.56)/2.28-2.69 (2.52), hind tibia 2.42-2.76 (2.58)/ 2.00-2.48 (2.35).

Etymology. – The name is an adjective; from Latin ‘rotundus’ (= rounded), referring to the rather rounded habitus.

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

Biology. – I confirmed Kalopanax pictus (Thunb.) ( Araliaceae ) as host plant; many nymphs were collected on this plant in Hokkaido. The species occurs in the montane zone of Japan.

Remarks. – This species is allied to E. nubilus , but it can be distinguished by the larger and broader body, the pale scutellum, the obscure markings on the forewing membrane, the apical corners of abdominal segment VII that do not extend beyond the genital segments ( fig. 47), the absence of dense setae on the ventral rim of the male genitalia ( figs. 42-43), the absence of distinct apical angle on the outer margin of the paramere ( fig. 45) and the scarcely emarginate posterior margin of the female genitalia ( fig. 50). E. nubilus and E. rotundus have a very unique genital structures: the dorsal protrusion of the genital capsule ( figs. 40- 43) and a remarkably inflated vesica ( figs. 48-50).