Desmidothrips japonicus sp. n.

(Figs 11, 22, 74–79)

Female macroptera. Body uniformly dark brown (Fig. 11); antennal segment I brown, II–IV yellow but shaded at extreme apex of III and distal third of IV, V–IX brown; fore wings dark with subbasal and distal areas including apical ring vein pale; clavus dark with extreme apex pale (Fig. 22); all legs dark brown with base of hind tibia pale; prominent body setae dark. Head 1.1–1.2 times as long as wide, arched at cheeks, densely sculptured with anastomosing striae on dorsal surface (Fig. 74); postocular setae in 2 rows but irregularly arranged medially. Antennal segment III and IV with sensoria 0.6–0.7 and 0.7 times as long as length of the segments, respectively, V with ventral sensorium having oval base (Figs 75, 76). Antennal segments I to IX ratio length/width as follows: 0.9–1.1, 1.7–1.9, 4.0–4.4, 3.2–3.6, 2.1–2.2, 1.6–1.7, 1.3–1.8, 1.0–1.2, 1.4–2.0. Pronotum 0.8–0.9 times as long as wide, densely sculptured with transverse anastomosing striae, with more than 50 discal setae and 1–2 pairs of posteromarginal setae short but distinctly stouter than discal setae. Mesonotum densely sculptured with transverse anastomosing striae, with small wrinkles between sculpture lines; lateral and posteromedian setae short and stout; anteromedian CPS absent. Metascutum with lateral elongate narrow and posteromedian short reticulations, anteromedian area with transverse dense sculpture lines, with small wrinkles between sculpture lines except anteromedially; CPS absent (Fig. 77a, 77b). Abdominal tergite I with about 8 transverse lines medially; tergites II– VIII smooth medially; tergite IX weakly sculptured with transverse striae, with a minor seta between S1 setae; sternites with posteromarginal setae submarginal on IV–VII (Fig. 78). Spermatheca ring jointed cross (Fig. 79).

Measurements (holotype female in microns). Body length 2040; head length 188, width 198, compound eye length 88, width 55; pronotal median length 190, width 205; metascutal median length 88; fore wing length 850, width at middle 125; abdominal tergite IX length 115, tergite X length 88; ovipositor length 440. Antennal segments I–IX length (width) as follows: 38 (38), 53 (30), 110 (28), 90 (25), 55 (25), 40 (25), 33 (23), 18 (15), 13 (9).

Male. Unknown.

Specimens studied. Holotype female, JAPAN, Kyushu, Fukuoka Pref., Kasuyu-gun, Sasaguri-chou, Kasuya Research Forest, Kyusyu University, on leaves of Castanea crenata [ Fagaceae] by fogging, 2.vi.2004, H. Kojima. Paratypes: 12 females collected together with holotype. The holotype and most paratypes are deposited in TUA.

Remarks. D. japonicus is very similar to D. walkerae but, in addition to the differences noted in the key, it has the mesonotum with intervals between the sculpture lines narrower, and CPS on metascutum is absent. Moreover, in D. walkerae the mesonotal lateral setae appear to be slightly more slender than in D. japonicus (in image of meso & metanota, Mound et al. 2017).

Etymology. In reference to locality.