Pilophorus okamotoi Miyamoto & Lee, 1966

(Figs 5C ̅D, 11D, 12I, 17A̅H, 19A–C)

Pilophorus okamotoi Miyamoto & Lee 1966: 379 (n. sp., desc.); Schuh, 2002 –2013, online catalog; Aukema, 2018, online catalog.

Material examined. JAPAN: Kyushu, Nagasaki Pref., Tsushima Island, Izuhara Town, Hiyoshi, 34.209555, 129.291200, Artemisia sp., 21 Jul 2020, H. Asanabe, 3 ♂ 3 ♀ (AMNH, TYCN) (AMNH _ PBI 00380670); same data except for date 4 Aug 2020, 3 ♂ 2 ♀ (NIAES, TYCN); same locality, hatching on 3 Aug 2020 (from oviposited egg under reared), to 2nd instar on 6 Aug, to 3rd on 7 Aug, to 4th on 10 Aug and emerging on 15 Aug, 1 ♂ (TYCN).

Rediagnosis. Recognized by its moderate size; rather slender body: weakly shining dorsum with uniformly distributed, short, reclining setae and lacking long upright setae; comparatively long antennae and legs; somewhat W-shaped hemelytral median band of scale-like setae (Fig. 5D); narrow and weak apical ridge of endosoma with bifurcate median process (Figs 11D, 17G); rather developed lateral fold of sclerotized ring (Fig. 12I); and basal (anterior) half part of interramal lobe lacking spinules (Fig. 18A). Detailed description including male genitalic structures was provided by Miyamoto & Lee (1966).

Measurements. See Table 2.

Biology. The population on Tsushima Island was observed to inhabit Artemisia vegetation growing along a residential street (Asanabe, pers. comm.). The first instar nymph of this species in a laboratory situation, developed to adult in 12 days. Two or three generations per year are assumed for P. okamotoi; the eggs appear to hibernate. Further information on the biology and immature stages were documented by Fukuda et al. (2020).

Discussion. Since the type series of Pilophorus okamotoi (8 specimens from Gyeongnam and Jeju Provinces, Korea) appears to have been missing, most of previous records of P. okamotoi from Japan were apparently confused with P. satoyamanus described below (e.g., Yasunaga, 2001). Some wildlife are known to be endemic to Tsushima Island and Korean Peninsula (Nagasaki Biological Society, 1976). In Japan, P. okamotoi is currently considered to be restricted to this island close to Korea. Each species can be identified by the characters in the above key (couplet 24) and allopatric distribution (see above checklist).