Cordilura yezoana, Iwasa, 2020

Cordilura yezoana sp. nov.

[Japanese name: Higenaga-ezo-funbae]

( Figs 28–31 View FIGURES 28–31 )

Type material examined. Holotype ♂, Japan: Horoka, Kamishihoro-cho, Tokachi , Hokkaido, 22. vi. 1997, leg. M. Iwasa ( OUAVM).

Diagnosis. The male of C. yezoana sp. nov. can be recognized by blackish thorax and abdomen with greyish microtrichose, yellow legs, and surstylus not bifurcated apically.

Description. Male ( Fig. 28 View FIGURES 28–31 ; holotype). Head: eyes reddish brown; frons brownish yellow, eye margin brown; face and gena yellow; occiput dark brown; postpedicel black, basally yellow and approximately 2 times as long as wide; pedicel yellow; arista black and short-haired; palpus white, spatulate, and with comparatively weak subapical seta; proboscis yellow; vibrissal angle with 1 strong vibrissae and 1 subvibrissa. Chaetotaxy (black): 4 fr, 3 or (1 proclinate, 2 lateroclinate), 1 vti (strong), 1 vte (weak), 1 oc, 1 poc.

Thorax: thin greyish microtrichose; scutum and scutellum black, proepisternum yellow in ventral half and black in dorsal half, with sparse long hairs; anepisternum, anepimeron and katatergite black; katepisternum ventrally yellow and dorsally black; meron brown; anatergite and metanotum black. Chaetotaxy: 2 pprn, 2 npl, 1 prest iar, 2+3 dc, 2 sa, 2 pa, 1 dsc (developed), 1 apsc (small), 1 prepst, 1 prepm, 1 strong and 2 weak anepst, 1 kpst. Wings: slightly tinged with brown; veins R 4+5 and M almost parallel; vein A 1 +CuA 2 extending to wing margin; calypter yellow, with hairs marginally; halteres whitish yellow. Legs ( Fig 28 View FIGURES 28–31 ): yellow; all femora with long hairs on ventral surface; fore tibia with 1 ad and 1 pd near middle, and 3 preapicals; mid tibia with 2 ad near middle and 1 pd at basal one-third and 1 pd at distal one-third; hind tibia with 1 ad and 1 pd at distal two-fifths and 1 ad and 1 pd at one-fifth, and 3–4 preapicals.

Abdomen: tergites black and thinly microtrichose, covered by short setulae and each tergite laterally and posteriorly with comparatively long setae; sternite IV round quadrangle; sternite V ( Fig. 29 View FIGURES 28–31 ) prominently bilobate (brown) posteriorly, covered by hairs; epandrium ( Figs 30, 31 View FIGURES 28–31 ) well developed, covered by setulae and with several pairs of distinct setae posterioly; surstylus ( Figs 30, 31 View FIGURES 28–31 ) slender and pigmented, and both close each other apically; cercal plate covered by setulae, with a pair of long setae.

Length. Body, 7.0 mm; wing, 5.2 mm.

Female. Unknown.

Distribution. Japan ( Hokkaido)

Etymology. This species is named after former given name of locality ( Hokkaido) where the holotype was collected.

Remarks. This species is similar to Cordilura tartariana Ozerov, 2007 in structure of male surstyli, but differs from it in the following characteristics: scutum black; katepisternum anteroventrally yellow and posterodorsally black; meron brown. In C. tartariana , scutum yellowish; katepisternum and meron wholly yellow.