Elasmostethus interstinctus (Linnaeus)

Elasmostethus interstinctus (Linnaeus) View in CoL

( figs. 1, 7-8, 19, 25-26, 32)

Cimex interstinctus Linnaeus, 1758: 445 .

Elasmostethus interstinctus – Hasegawa, 1958: 6; Miyamoto & Yasunaga, 1989: 188.

Redescription. – Body ovoid; 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 V. Rostrum greenish yellow with fuscous apex, reaching to middle coxae. Pronotum green, reddish along posterolateral margin, densely punctate except for calli; humeral angle projecting weakly, 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 and 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 entirely black, except for narrowly greenish yellow lateral margins; posterior margin of segment VII reddish yellow. Connexiva greenish yellow, reddish on apex of segment VII. Sterna greenish yellow, impunctate; each segment with a pair of fuscous spots laterally; segment VII reddish on apical corner. Pendergrast’s organs semicircular ( fig. 32).

Male genitalia: Sides of genital capsule rounded in dorsal view; ventral rim furnished with a pair of lower tufts and a pair of upper tufts, and with a pair of black teeth laterally; infolding of dorsal rim with a pair of long setal tufts at each side of middle ( figs. 7-8); paramere with broad rectangular outer projection reflexed caudad ( fig. 19); phallotheca with a large dorsal diverticulum; dorsal lobe of conjunctival sheath well developed and divided into 5 lobules ( figs. 25-26).

Female genitalia: Posterior margin of genital segments VIII rounded laterally and with a shallow median emargination ( fig. 32).

Dimensions. – 3/ ♀: Body length 9.56-10.90 (mean 10.40)/10.00-11.90 (11.30); width of head including eyes 1.73-1.93 (1.84)/1.79-2.00 (1.91); length of antennal segment I 0.86-1.10 (1.00)/0.76- 1.00 (0.91), II 1.38-1.69 (1.55)/1.28-1.52 (1.36), III 0.86-1.10 (0.96)/0.83-1.00 (0.91), IV 1.45-1.73 (1.57)/1.31-1.52 (1.43), V 1.35-1.55 (1.42)/1.14- 1.45 (1.27); width of pronotum 4.62-5.45 (5.10)/ 4.83-6.00 (5.60); width of scutellum 2.42-2.90 (2.74)/2.62-3.38 (3.06); length of scutellum 2.90- 3.66 (3.35)/3.24-3.93 (3.63); length of fore femur 2.00-2.55 (2.33)/2.07-2.48 (2.30), fore tibia 2.07- 2.35 (2.23)/1.86-2.28 (2.09), middle femur 2.21- 2.76 (2.58)/2.35-2.83 (2.67), middle tibia 2.28-2.62 (2.43)/1.73-2.62 (2.35), hind femur 2.76-3.52 (3.18)/2.69-3.45 (3.14), hind tibia 2.83-3.59 (3.26)/ 2.69-3.31 (3.05).

Distribution. – Japan (Hokkaido, Rishiri Is., Rebun Is.); Korea, China, Russian Far East (Magadan, Kamchatka, Khabarovsk, Amur, Primorskij, Sakhalin, Kurils), Europe, North America.

Biology. – Betula ermanii Cham. ( Betulaceae ) could be confirmed as a host plant. On this we collected many eggs and young instar nymphs in Hokkaido. This species occurs mainly in the montane to subalpine zone in Hokkaido, but the adults are occasionally found in the lowland zone as well. The adults are frequently attracted to light.

Remarks. – This species is characterized by the black abdominal terga under wings, the black tooth on male ventral rim in the male genitalia ( figs. 7-8), shape of paramere ( fig. 19), and the medially emarginate posterior margin of female genitalia ( fig. 32).

Material examined. – JAPAN: Hokkaido: 2♀, Kutsugata-Mikaeridai, Rishiri Is. , 20.ix.1991, M. Tomokuni ( NSMT) ; 13, Mt. Kuro-dake , Taisetsu-zan Mts., 11.vii.1960, S. Takagi ; 2♀, Mt. Tomuraushi-dake , Taisetsu-zan Mts., 17- 23.vii.1968, H. Takizawa ; 1♀, Mt. Tokachi-dake , Taisetsu-zan Mts., 18.vii.1951, T. Oku ( SEHU) ; 13 3♀, Mt. Midori-dake , Taisetsu-zan Mts., 7.viii.2001, A. Yamamoto ; 23 1♀, Kogen-onsen , Kamikawa, 14.iv.1998, A. Yamamoto ; 13 6♀, Kanoko-dam , Ashoro, 20.ix.1995, A. Yamamoto ; 13, Tokachi-Mitsumata, Kamishihoro , 29.vii.1995, S. Ohno ; 13 1♀, Sin-Arashiyama, Memuro , 20.ix.1995, A. Yamamoto ( OMO) ; 13, Oketo-ko, Oketo , 19.ix.1998, N. Muramatsu ( KRMK) ; 1♀, Mt. Shokanbetsu-dake , Mashike, 10.ix.1995, G. Ito ; 1♀, Shirai-sawa , Otaru, 1.ix.1998, A.Yamamoto ; 13 1♀, Hokkaido Univ ., Sapporo, 5-6.ix.1998, G. Ito ; 23 1♀, Mt. Soranuma-dake , Sapporo, 6.vi.1999, A. Yamamoto ( OMO) ; 23 2♀, Nakayama-toge , Sapporo, 16.ix.1986, S. Kudo ( SEHU) ; 63 4♀, Mt. Yotei-zan , Makkari, 30.viii.2000, A. Yamamoto ; 13 1♀, Asahi-onsen , Iwanai, 18.viii.1998, A. Yamamoto ; 13 2♀, Shinsen-numa , Kyowa, 17.viii.1994, M. Ohara ; 13, Kokkuri-ko , Rankoshi, 19.viii.1997, A. Yamamoto ; 1♀, Mt. Kariba-yama , Shimamaki, 6-8.viii.1988, M. Ohara et al. ( OMO) . – CHINA: 13 2♀, Harbin , 16-17.vi.1963 ( NUT) . – RUSSIA: 23 1♀, 8 km S of Nagornyj , S. Yakutia, 16-17.vii.1995, T. Yasunaga ( OUO) .