Empis (Planempis) tianmushana, Liu, Xiaoyan, Saigusa, Toyohei & Yang, Ding, 2012

Liu, Xiaoyan, Saigusa, Toyohei & Yang, Ding, 2012, Two new species of Empis (Planempis) from Oriental China, with an updated key to species of China (Diptera: Empidoidea), Zootaxa 3239, pp. 51-57 : 52-54

Empis (Planempis) tianmushana sp. nov.

( Figs. 1–3 , 7 )

Diagnosis. Stylus rather short, 0.3X as long as first flagellomere. Abdomen partly brownish yellow or dark yellow at base. Legs yellow except coxae blackish with apices of fore and mid coxae brownish yellow, extreme tips of femora black, tip of hind tibia blackish, and tarsi blackish with bases of fore and mid tarsomere 1 dark brownish yellow. Cell dm long, longer than second basal cell. Male cercus with short thick dorsal arm.

Description. Male. Body length 4.6–5.6 mm, wing length 4.8–5.2 mm.

Head black, pale gray pollinose. Eyes contiguous on frons, pale reddish brown. Setae and setulae on head black except posteroventral surface with mostly pale setulae; ocellar tubercle distinct, with 2 long oc and 4 very short posterior setulae. Antenna black; first flagellomere 4X longer than wide, stylus 0.3X as long as first flagellomere. Proboscis long, 1.5X longer than head height, dark brown with short black setulae; palpus dark yellow with black ventral setulae.

Thorax black, pale gray pollinose; scutum with 3 dark black vittae. Setae and setulae on thorax black; setulae on mesonotum short and sparse; humerus with 4 setulae and 1 long h; pronotum with long setae; 3 long strong npl subequal in length, acr short setula-like and biseriate; dc nearly biseriate and short setula-like except only 2 posteriormost dc relatively long, 1 presc (longer and stronger than 2 posteriormost dc), 1 sa, 1 psa; scutellum with two pairs of sc (lateral pair distinctly shorter than apical pair). Laterotergite with fan of long dense pale yellow setae. Prosternum with some long pale yellow setae laterally. Legs yellow except coxae blackish with tips of fore and mid coxae blackish, extreme tips of femora black, tip of hind tibia blackish; tarsi blackish with base of tarsomere 1 dark brownish yellow. Setulae and setae on legs black. Fore and mid femora subequal in thickness, hind femur 1.25X as thick as mid femur. Hind tibia slightly thickened, hind tarsomere 1 indistinctly thickened (slightly narrower than hind tibia). Mid femur with row of short pv. Hind femur with 7 av on apical third. Fore tibia with 3-4 pd and 1 pv, apically with 1 av and 1 pv. Mid tibia with 3 ad, apically with 4 setae. Hind tibia with 4-5 ad, apically with 4 setae (only 1 ad long). Hind tarsomere 1 with 1 weak ad, 2 weak pd and 4 short spine-like av; apically with 4 setae (1 ad and 1 pd long). Wing ( Fig. 7 ) hyaline; brownish stigma long, narrow; veins dark brown; R4 somewhat erect, cell r4 nearly with right angle at base, M1 and M2 reaching wing margin; discal cell long, longer than second basal cell. Squama pale yellow, bordered with pale yellow setulae. Halter pale yellow.

Abdomen black with pale gray pollen except tergite 2 (holotype) or tergites 2–4 blackish (paratype) with brownish yellow lateral margin, sternites 1–4 dark yellow; hypopygium dark reddish yellow except tergite 9 black. Setulae and setae on abdomen black. Tergite 8 narrow and strip-like, separated from sternite 8.

Male genitalia ( Figs. 1–3 ): Epandrial lobe slightly longer than wide, basally rather narrow, apically somewhat acute. Cercus large and broad, nearly as wide as epandrial lobe in lateral view, two cerci together nearly as wide as long in dorsal view; dorsal arm short thick with obtuse tip bent sharply ventrally, ventral arm short finger-like.

Phallus (invisible from outside in lateral view) strongly curved upwards, nearly geniculate, apically thin with truncate tip.

Female. Unknown.

Type material. HOLOTYPE 3, CHINA: Zhejiang, Tianmushan Mountain, Meijiacun, 30°26ʹN 119°34ʹE, 2011. V. 15, Weihai Li. PARATYPE: 1 3, same data as holotype.

Distribution. China (Zhejiang).

Etymology. The specific name refers to the type locality Tianmushan Mountain.

Remarks. The new species is similar to E. (P.) ingrata Frey from Taiwan of China, but can be easily separated from it by the following features: abdomen partly brownish yellow or dark yellow at base; nearly biseriate dc; all femora yellow except extreme tips black; hind tibia not swollen apically, as thick as its femur; male cerci short, slightly extending posteriorly beyond epandrial lobe, widely flattened dorsally. In E. (P.) ingrata , the abdomen is black, with the lateral parts of the terga light gray pollinose; dc is uniseriate; the hind femur is slightly brownish at middle; the hind tibia is swollen apically, thicker than its femur; the two male cerci are strongly produced posteriorly beyond epandrial lobe, weakly swollen dorsally ( Frey 1953; Shamshev 2002; Wang et al. 2010).

Figures

FIGURES 1 – 3. Empis (Planempis) tianmushana sp. nov. (male). 1. Genitalia, lateral view. 2. Cerci, dorsal view. 3. Phallic complex, lateral view. Scale bar 0.25 mm.

FIGURES 7 – 8. Wing (male). 7. Empis (Planempis) tianmushana sp. nov. 8. Empis (Planempis) zhuae sp. nov. Scale bar 1 mm.