Elasmostethus hasegawai, Yamamoto, 2003

Elasmostethus hasegawai View in CoL sp. n.

( figs. 6, 13-14, 22, 29, 35)

Type material. – Holotype 3, Kamikochi , Azumi, Nagano Pref., Honshu, Japan, 12.ix.1952, H. Hasegawa ( NIAS). – Paratypes: Honshu: 13, Yoshibe-zawa , Mt. Hayachine-san, Kawai, Iwate Pref., 14.vi.1987, K. Haga ( SEHU) ; 13 2♀, same locality, 11.x.1995, A. Yamamoto ( OMO) ; 13, Mt. Tashiroyama , Tateiwa, Fukushima Pref., 20.viii.1951, K. Nagayama ( NIAS) ; 1♀, Mitsumata , Horigane, Nagano Pref., 4.vi.1987, M. Hayashi ; 23, same locality, 18.ix.1988, M. Hayashi ; 13 1♀, same locality, 4.ix.1991, M. Hayashi ( SUS) ; 13 1♀, same locality, 12.vi.1996, A. Yamamoto ; 23 2♀, same locality, 14.ix.1996, A. Yamamoto ( OMO) ; 1♀, same data ( SEHU) ; 13, Nakafusa-onsen , Hodaka, Nagano Pref., 11.vi.1967, N. Fukuhara ( NIAS) ; 13, same locality, 14.vi.1996, A. Yamamoto ( OMO) ; 2♀, Kamikochi , Azumi, Nagano Pref., 10.viii.1951, H. Hasegawa ; 223 7♀, same locality, 12.ix.1952, H. Hasegawa ; 63 5♀, Shirahone-onsen , Azumi, Nagano Pref., 8.ix. 1951, H. Hasegawa ( NIAS) ; 13, Shimashima-dani , Azumi, Nagano Pref., 12.vii.1960, I. Hiura ( OMNH) .

Description. – Body ovoid, somewhat 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 usually entirely fuscous, sometimes with segments I and II dark green. 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, often with a fuscous long stripe along vein R+M, densely punctate; apical corner slightly infuscate; clavus red, densely punctate; membrane infuscate and with a triangular, dark 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. 35).

Male genitalia: Sides of genital capsule weakly rounded, strongly convergent basally in dorsal view; ventral rim furnished with a pair of lower tufts and a pair of upper tufts but lateral teeth lacking; upper tuft strongly elongate and weakly sinuate; infolding of dorsal rim with a pair of long setal tufts at each side of middle ( figs. 13-14); paramere rather short and with a weak, triangular outer projection ( fig. 22); phallotheca with a large dorsal diverticulum; dorsal lobe of conjunctival sheath developed and divided into 5 lobules; extreme right lobule (in the figure) somewhat reduced ( fig. 29).

Female genitalia: Posterior margin of genital segments VIII strongly rounded laterally and with a shallow median emargination ( fig. 35).

Dimensions. – 3/ ♀: Body length 9.19-10.83 (9.90)/9.65-10.92 (10.36); width of head including eyes 1.73-1.86 (1.78)/1.73-1.93 (1.84); length of antennal segment I 0.83-1.04 (0.93)/0.79-0.90 (0.83), II 1.28-1.62 (1.41)/1.04-1.24 (1.12), III 0.86-1.07 (0.99)/0.90-1.00 (0.96), IV 1.41-1.66 (1.56)/1.31- 1.45 (1.38), V 1.28-1.52 (1.40)/1.21-1.31 (1.27); width of pronotum 4.42-5.38 (4.87)/4.76-5.45 (5.22); width of scutellum 2.42-2.97 (2.64)/2.62- 3.04 (2.85); length of scutellum 2.90-3.45 (3.17)/ 3.04-3.45 (3.30); length of fore femur 2.00-2.42 (2.13)/1.86-2.14 (2.06), fore tibia 2.00-2.21 (2.08)/ 1.93-2.07 (1.98), middle femur 2.28-2.69 (2.47)/ 2.14-2.62 (2.41), middle tibia 2.07-2.42 (2.22)/2.14- 2.35 (2.22), hind femur 2.69-3.17 (2.88)/2.62-3.11 (2.83), hind tibia 2.69-3.11 (2.92)/2.62-2.90 (2.74).

Etymology. – Named in honor of Mr. Hitoshi Hasegawa, who collected the holotype. The name is a noun in the genitive case.

Distribution. – Japan (Honshu).

Biology. – This species is considered to be closely associated with Cercidiphyllum japonicum Sieb. et Zucc. ( Cercidiphyllaceae ). Prof. M. Hayashi collected many adults on this plant in Mitsumata, Horigane, Nagano Pref., Honshu (pers. comm.), and I also found some adults in Mt. Hayachine-san, Iwate Pref., Honshu. Young instar nymphs have not yet been found. This species inhabits the montane or subalpine zone in Honshu.

Remarks. – This new species is similar to E. interstinctus in general appearance. It is characterized by the infuscate forewing membrane and antennae, the fuscous long stripe that is often present on the corium ( fig. 6), the characteristic sinuate upper tuft of male genital capsule ( figs. 13-14), the shape of the paramere ( fig. 22), and the strongly laterally rounded posterior margin of the female genitalia ( fig. 35).