Elasmostethus brevis Lindberg, 1934

Elasmostethus brevis Lindberg View in CoL

( figs. 3, 11-12, 21, 28, 34)

Elasmostethus brevis Lindberg, 1934: 5 .

Redescription. – Body ovoid, with comparatively rounded sides; 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 corners. Pendergrast’s organs semicircular ( fig. 34).

Male genitalia: Sides of genital capsule strongly rounded in dorsal view; ventral rim rounded, furnished with a pair of lower tufts and a pair of upper tufts; lateral rim with a large, blackish-tipped acute projection; infolding of dorsal rim with a pair of long setal tufts at each side of middle ( figs. 11-12); paramere with semicircular outer projection weakly reflexed caudad, ( fig. 21); phallotheca with a large dorsal diverticulum; dorsal lobe of conjunctival sheath developed and divided into 5 lobules ( fig. 28).

Female genitalia: Posterior margin of genital segments VIII rounded and lacking median emargination ( fig. 34).

Dimensions. – 3/ ♀: Body length 9.83-10.92 (10.47)/9.65-11.65 (10.97); width of head including eyes 1.73-1.93 (1.84)/1.79-2.00 (1.90); length of antennal segment I 0.93-1.07 (1.01)/0.79-0.93 (0.85), II 1.38-1.79 (1.64)/1.24-1.48 (1.37), III 0.90-1.10 (1.00)/0.79-0.97 (0.88), IV 1.38-1.66 (1.51)/1.24- 1.55 (1.40), V 1.21-1.38 (1.30)/1.17-1.31 (1.25); width of pronotum 4.07-5.31 (4.90)/4.69-5.52 (5.16); width of scutellum 2.35-2.97 (2.77)/2.76- 3.17 (2.95); length of scutellum 2.83-3.59 (3.34)/ 3.24-3.59 (3.46); length of fore femur 2.07-2.42 (2.29)/1.93-2.28 (2.17), fore tibia 2.00-2.42 (2.22)/ 1.93-2.14 (2.06), middle femur 2.35-2.83 (2.62)/ 2.35-2.76 (2.56), middle tibia 2.14-2.55 (2.42)/2.14- 2.48 (2.30), hind femur 2.76-3.38 (3.18)/2.62-3.17 (2.94), hind tibia 2.83-3.45 (3.24)/2.69-3.17 (2.95).

Distribution. – Japan (Hokkaido, Honshu); Korea, China, Russian Far East (Magadan, Kamchatka, Khabarovsk, Amur, Primorski, Sakhalin), European Russia, Scandinavian.

Biology. – I confirmed Populus maximowiczii A. Henry ( Salicaceae ) as a host plant, on which many eggs and young instar nymphs were collected in Hokkaido. Further, Populus sieboldii Miquel seems to be another host plant on which many adults and nymphs were collected in Sapporo, Hokkaido (M. Hayashi, pers. comm.). This species occurs mainly in the montane zone in Hokkaido and Honshu, and can be found in streamside forest.

Remarks. – This species resembles E. interstinctus very much in general appearance, but can be distinguished by the large lateral projections on the male genital capsule ( figs. 11-12), the shape of the paramere ( fig. 21), and the lack of a median emargination on the posterior margin of the female genitalia ( fig. 34).

Material examined. – JAPAN: Hokkaido: 43 3♀, Taisetsuko , Kamikawa, 24.viii.2001, A. Yamamoto ; 13, Mt. Upepesanke-yama , Kamishihoro, 22.vii.1989, K. Haga ; 13, Kuroishi-daira , Kamishihoro, 22.vii.1944, A. Yamamoto ; 1♀, Mt. Kitoushi-yama , Ashoro, 3.vi.1989, K. Haga ; 63 1♀, Kannon-zawa , Sapporo, 2.viii.1998, A. Yamamoto ; 13, Misumai , Sapporo, 10.v.1994, K. Sayama ( OMO). – Honshu: 6♀, Nakafusa-onsen , Hodaka , Nagano Pref., 14.vi.1996, A. Yamamoto ( OMO) ; 33, Kamikochi , Azumi, Nagano Pref., 16.viii.1951, T. Nakane ; 23, Tokusawa , Azumi, Nagano Pref., 4.viii.1952, E. Nakanishi ; 13, Shimashima-dani , Azumi, Nagano Pref., 27.vii.1955, T. Nakane ( NIAS) .