Neolygus yonanus n. sp.

Figs. 5A–B, 9B, 10A–D, 17M–O

Material examined. Holotype (♂). JAPAN: Ryukyus, Okinawa Island, Kunigami Village, Yona, 26.76, 128.22, 21 Feb 1973, H. Hasegawa (NIAES) (AMNH _ PBI 00378769).

Diagnosis. Currently known by a single male specimen. Most closely related to N. kyushuensis (Yasunaga) (Fig. 2A–B), from which N. yonanus n. sp. can be distinguished by its ovoid body (Fig. 5A); apical 3/4 of clypeus darkened (Fig. 5B); antennal segment II slightly longer than metafemur; labium as long as basal width of pronotum; posterior margin of pronotum, scutellum and clavus darkened (Fig. 5A); apical protuberances of parameres more developed (Fig. 10A–D); and vesical spiculum tapered apically (Figs. 9B, 17O).

Description. Holotype male: Body oval (Fig. 5A); dorsum pale brown (probably greenish when alive), with uniformly distributed, pale, simple, reclining setae. Head shining; vertex narrow, with basal transverse carina that is as thick as pronotal collar; apical 3/4 of clypeus darkened (Fig. 5B). Antenna pale brown; apex of segment II, whole segments III and IV brown; segment II slightly longer than metafemur; segment III longer than head width across eyes. Labium shiny pale brown, reaching but not exceeding apex of metacoxa. Pronotum shining, darkened posteriorly; scutellum dark brown; pleura including scent efferent system pale brown. Hemelytra somewhat matte; clavus darkened; apical part of corium semi-circularly darkened; membrane pale smoky brown. All coxae and legs pale brown; metafemur with two brown rings that are obliterated ventrally; tibial spines brown; apex of each tarsomere III darkened. Ventral side of abdomen uniformly pale brown.

Male genitalia (Figs. 9B, 10A–D, 17M–O): Parameres with rather developed apical protuberance on sensory lobes (Fig. 10A–D); vesical spiculum almost straight, tapered and flattened apically (Figs. 9B, 17O).

Female: Unknown.

Measurements: See Table 1.

Etymology. Named for the type locality, Yona (in Kunigami Village, North Okinawa Island); Latinized as an adjective.

Distribution. Japan (Ryukyus: Okinawa Island).

Biology. Collection record suggests that this new species appears earliest (February) among the Japanese congeners. No other information is available on the biology.