Cordilura katoi sp. nov.

[Japanese name: Higenaga-maeki-funbae]

(Figs 10–14)

Type material examined. Holotype ♂, Japan: Osawa River, Kawaratai, Nishimeya Vill., Aomori Pref., Honshu, 19. v. 2013, leg. D. Kato (OUAVM) . Paratypes: [ Honshu] 1 ♂, same data as holotype (OUAVM) ; 1 ♂, Tsutanuma Path, Okuse, Towada City, Aomori Pref., 10. v. 2014, leg. D. Kato (KY) ; 1 ♂, Inekari River, Koguriyama, Hirosaki City, Aomori Pref., 13. v. 2013, leg. D. Kato (KY) ; 1 ♀, Sôma Path, Hirosaki City, Aomori Pref. 24. v. 2013, leg. D. Kato (OUAVM) .

Diagnosis. C. katoi can be recognized by blackish and shining body, yellow fore legs, blackish mid and hind legs, and surstylus which is not bifurcated apically.

Description. Male (Fig. 10; holotype). Head: eyes reddish brown; frons wholly black; face silvery pruinose; parafacial yellow; gena yellow, posteriorly microtrichose; occiput dark brown and subshining; postpedicel yellow and approximately 2 times as long as wide; arista prumose; palpus yellow with 1 strong subapical seta as long as palpus; proboscis black and stout, with developed labella; vibrissal angle with 1 vibrissa (strong) and 1 subvibrissa (weak). Chaetotaxy (black); 4 fr, 3 or (1 proclinate, 1 lateroclinate, 1 lateroreclinate), 1 oc, 1 vti (strong), 1 vte (weak), 1 poc.

Thorax: black in ground color; scutum subshining; scutellum shining; proepisternum with sparsely long hairs; anepisternum, anepimeron and meron slightly microtrichose; katepisternum microtrichose, and with sparsely long hairs; katatergite and metanotum subshining. Chaetotaxy (black): 2 pprn, 2 npl, 1 presut ial, 2+3 dc; 2 sa, 2 pa, 2 prepst, 1 prepm; anepst composed of 1 strong and 3–4 weak setae, 1 kepst, 1 dsc (strong), 1 apsc (weak). Wings: hyaline, slightly tinged with brown; veins brown; veins R 4+5 and M almost parallel; vein A 1 +CuA 2 extending wing margin; calypter whitish yellow, with hairs marginally; halteres yellow. Legs: fore coxae yellow, mid and hind coxae brown to black, thinly pruinose; fore femur yellow and ventrally with a row of long hairs; mid and hind femora black except for basal part; fore tibia yellow with 1 ad near middle, 1 pd at basal one-third, 2 p at basal and distal one-third, and 4–5 preapical setae; mid tibia black with 1 a at distal one-third, 2 pd at basal and distal one-third, and 5 preapical setae; hind tibiae black with 2 ad and 2 pd near middle and 5 preapical setae; fore tarsi light brown; mid and hind tarsi dark brown.

Abdomen: tergites black and shining, covered by short setulae with long setae at lateral and posterior margins; sternite IV trapezoid; sternite V (Fig. 11) deeply pigmented and prominently bilobed (creamy-white in color) posteriorly, clothed with setulae; epandrium (Figs 12, 13) well pigmented covered by setulae and 2–3 pairs of distinct setae posteriorly; surstylus (Figs 12, 13) basally slender and apically developed to large lobe, covered by setulae posteriorly; cerci long, slender and slightly sinuate, covered by setulae.

Female. Ovipositor (Fig. 14) cylindrical and slightly compressed; posterior part of tergite VII and sternite VII membranous; tergite VIII and sternite VIII medially divided, and sternite VIII pointed posteriorly; proctiger weak; epiproct dorsally with 2 distinct setulae; hipoproct nearly flat; cerci rounded fusiform and weak. Other characteristics same as those of male.

Length (♂ ♀). Body, 6.5–7.5 mm; wing, 5.6–6.0 mm.

Distribution. Japan (Honshu).

Etymology. This new species is named after Dr. D. Kato who first collected this species.

Remarks. This species seems to be similar to Cordilura bicoloripes Ozerov, 1997, but easily distinguished from it by having black mid and hind legs and male surstyli not bifurcate; in C. bicoloripes, legs yellow except for distal one-third of mid femur, and male surstyli ventrally expanded and bifurcate.