Hypseloecus fukutomii sp. nov.

Figs. 2 A−B, 3A−D, 6A−G, 9

Material examined. Holotype (♂), JAPAN: Ryukyus, Okinawa Prefecture, Ishigaki Island, Sakie, Mt. Yarabudake, 24°26'N 124°05'E, on Taxillus nigrans, 2 Dec 2023, H. Fukutomi (NWHS) (AMNH_PBI 00378809).

Diagnosis. Currently known by a single male holotype specimen. Recognized readily by its ovoid body (Fig. 2A); pale olive-brown dorsum without noticeable dark macula; pale brown basal part of antennomere II; widely whitish brown femora; and obscure spots at bases each tibial spines (Fig. 2B). Based on the similarity in the male genitalia, this new species is most closely related to H. tamaderai sp. nov., from which H. fukutomii sp. nov. can be distinguished by the characters mentioned in the above key, more densely distributed, silvery, lanceolate setae on the thoracic pleura (Fig. 6B), developed sub-lateral protuberance of the left paramere (Fig. 3A), pointed apex of the right paramere (Fig. 3B) and relatively narrower and longer median process of the vesica (Fig. 3C).

Description. Male: Body oval; basic coloration pale olive brown; dorsum relatively shining, without dark or reddish macula (Fig. 2A). Head pale olive brown; width of head across eyes 1.55 times greater than height. Antenna pale grayish brown; base and apex of segment I, apical 1/5 of II and entire III dark brown (segment IV missing); extreme bases of segments II and III white. Labium shiny chocolate brown, about as long as basal width of pronotum; apex reaching but not exceeding apex of mesocoxa; apical part of segment IV darker. Pronotum relatively shining, almost uniformly pale olive-brown; thoracic pleura shiny chocolate brown, with densely distributed, long, scale-like setae (Fig. 6B); metathoracic scent efferent system creamy yellow, with narrow peritreme (Fig. 6C). Hemelytron relatively shining, almost uniformly pale olive-brown; membrane pale smoky brown, semitransparent, with pale veins and spots. Coxae pale reddish brown, except for creamy yellow procoxa; legs pale grayish brown; each femur lacking noticeable macula or spot; each tibia with obscure, small spots at bases of spines, without dark annulations (or rings); meta-tarsomere III longer than II (Fig. 6G); pretarsal structure as in Fig. 6F. Abdomen shiny chestnut brown. Male genitalia (Fig. 3 A−D): left paramere with developed sub-lateral protuberance (Fig. 3A); hypophysis of right paramere pointed (Fig. 3B); vesical median process relatively long, narrow (Fig. 3D). Female: Unknown.

Measurements. See Table 1.

Etymology. Named after Mr. Hirokazu Fukutomi, who kindly provided invaluable specimen of this new species; a noun in the genitive case.

Biology. A single male adult of this new species was collected from Taxillus nigrans (Hayata) Danser, which is considered the breeding host. No other information is currently available.