Tachyusa wei Pace, 1990

Pa ṡnik, Grzegorz, 2006, A revision of the World species of the genus Tachyusa Erichson, 1837 (Coleoptera, Staphylinidae: Aleocharinae), Zootaxa 1146, pp. 1-152 : 103-105

Tachyusa wei Pace, 1990 ( Figs. 103–105)

Tachyusa (Caliusa) wei Pace, 1990: 88

Ischnopoda (Caliusa) hebeiensis Pace, 1998: 404 , syn. n. Type material. Tachyusa wei Pace. Holotype: ♀: China: Peking, Ba Da Ling , VII.1980, de Rougemont (GRPC). Paratype: ♀: same data as the holotype (GRPC).

Tachyusa hebeiensis Pace. Holotype: ♂: China: Hebei, Beidaine , 29.V.1993, de Rougemont (MHNG).

Additional material. China: Heilungjiang, Harbin , 21.V.1966, P.M. Hammond, 1 ex ( BMNH) ; Heilungjiang, Erlungshan , 6.VI.1965, P.M. Hammond, 1 ex ( BMNH) ; Peking ”[Beijing]: Summer Palace , 31.VIII.1980, P.M. Hammond, 19 exx ( BMNH) ; Shaanxi, bank of Wei tle river, near autoroad to Xian Airp., 15 km N Xian, 400 m, 22.VIII.1995, Wrase, 1 ex ( MSPC) . Japan: Aikawa, Ichihara­shi , Chiba Pref., 4.V.1994, K. Ohgi, 3 exx ( ISEA) ; 11 exx ( SINPC); Hirosa , Okayama Pref., 3.V.1977, S. Naomi, 2 exx ( SINPC) ; Iwaubetsu, Shiretoko, Hokkaidon , 9.VII.1986, S. Nomura, 2 exx ( SINPC) ; Kanagawa, Okayama Pref., 8.V.1977, S. Naomi, 1 ex ( SINPC) ; Kawasaki , Kanagawa Pref., 10.IV.1977, M. Tao, 1 ex ( ISEA) ; 10 exx ( SINPC); 3.V.1978, M. Tao, 7 exx ( SINPC) ; Kumagawa, Hitoyoshi City, Kumamota Pref. , 6.IV.1977, S. Naomi, 2 exx ( ISEA) ; 8 exx ( SINPC); Kurihashi , Saitama Pref., 10.X.1977, M. Tao, 2 exx ( ISEA) , 7 exx ( SINPC); Matsuura City , Nagasaki Pref., 20.III.1976, H. Ohiski, 1 ex ( SINPC) ; Mebukibashi, Noda­shi , Chiba Pref., 6.IV.1990, Takeda, 2 exx ( SINPC) ; Mount Kiyosumi , Chiba Pref., 3.IX.1990, T. Takada, 1 ex ( SINPC) ; Nonoguchi , Okayama Pref., 1.V.1977, Naomi, 1 ex ( SINPC) ; 10.V.1981, K. Yoshihara, 2 exx ( SINPC) ; Nugata , 4–16.IX.1881, G. Lewis, 6 exx ( BMNH) ; 2 exx ( FMNH); Shirakawa, Kumamoto City, Kumamota Pref. , 30.III.1977, S. Naomi, 2 exx ( ISEA) ; 1 ex ( SINPC); Suga­arata, Sakae­cho , Chiba Pref., 30.X.1989, Takeda, 1 ex ( SINPC) ; Tama river, Kawasaki City , Kanagawa Pref., 2.X.1982, Tao, 1 ex ( ISEA) ; Tomen, Yoro valley , Chiba Pref., 22.V.1990, T. Takeda, 8 exx ( SINPC) ; Tonegawa, Sakaetyo , Chiba, 5.V.1991, Takeda, 1 ex ( SINPC) ; Tsuchiura, Ibaragi Pref. , 23.VI.1984, S. Ohmmo, 1 ex ( SINPC) ; Tsurumiku, Yokohama City , Kanagawa Pref., 10.VII.1983, Tao, 1 ex ( SINPC) ; Urawa­shi , Saitama Pref., 16.IV.1994, K. Ohgi, 1 ex ( SINPC) ; Yokohama , Kanagawa Pref., 1.IV.1978, Tao, 1 ex ( SINPC) ; 7.IV.1880, G. Lewis, 1 ex ( BMNH) . North Korea: Prov. Pyongyang, Pyongyang, 21.VI.1974, 5 exx ( ISEA) ; Prov. Pyongyang, Pyongyang, 6.VII.1981, 1 ex, A. Szeptycki ( ISEA) ; Prov. Hamgyong, Jangang­do , 24.IX–1.X.1991, 3 exx ( ISEA) .

Redescription. Body. Length 2.7–3.2 mm, convex, parallel­sided, glossy; body colour pitchy brown to black; three basal tergites often paler, brownish red, legs testaceous with tarsi yellow, antennae brown with antennomeres 1–3 reddish yellow.

Head circular in outline; convex, eyes large, moderately protruding from lateral contours of head, length of each seen from above subequal to that of postocular region; surface of head without microsculpture; puncturation fine and dense. Antennae short, clearly increasing in width apically, antennomere 3 shorter than 2, antennomeres 4–7 longer than wide, antennomeres 8–10 quadrate, antennomere 11 nearly conical.

Pronotum quadrate, lateral sides gradually narrowed in straight line to obtuse hind angles; before base with small and shallow transverse impression; surface without microsculpture; puncturation fine, dense and asperate; pubescence at midline directed posteriorly.

Elytra subquadrate, at suture as long as pronotal length at midline; surface lacking microsculpture; puncturation fine, dense and asperate.

Abdomen parallel­sided, bases of tergites 3–5 each with deep transverse impression, impressions with 7–8 longitudinal ridges, tergal puncturation fine and moderately dense, punctures moderately small and well visible, surface without microsculpture.

Male. Aedeagus as in Figs. 103–104.

Female. Spermatheca as in Fig. 105.

Taxonomic notes. A comparison between the types of Tachyusa wei and Tachyusa hebeiensis , and examination of additional specimens revealed no difference in external characters and genitalia. Therefore, T. hebeiensis becomes a junior synonym of T. wei .

Remarks. See under T. gilvipes .

Distribution. Tachyusa wei is an Eastern Palaearctic species known from China, Japan and North Korea.