Systropus hoppo Matsumura, 1916

Cui, Weina & Yang, Ding, 2010, Two new species and two new synonyms of Systropus Wiedemann, 1820 from Palaearctic China (Diptera: Bombyliidae), Zootaxa 2619, pp. 14-26 : 20-21

Systropus hoppo Matsumura, 1916

( Figs. 16–23 , 40–42 )

Systropus hoppo Matsumura, 1916: 285 . Type locality: China ( Taiwan).

Systropus tetradactylus Evenhuis, 1982: 33 . Type locality: China ( Taiwan).

Systropus beijinganus Du & Yang, 2009: 315 . Type locality: China (Beijing). Syn. nov.

Diagnosis. Mesoscutum with three isolated pale yellow lateral spots. Metasternum yellow with a wide black stripe on both sides. Hind coxa black with anterolateral area yellow; trochanter black; femur brownish yellow; tibia yellow; tarsus dark brown.

Description. Male. Body length 21–23 mm, wing length 13–15 mm.

Head black except lower frons, face and gena yellowish, ocellar tubercle red brown. Setulae on head yellowish, except lower frons, face and gena short silvery white pile; upper occiput with black setulae along eye margin. Antennal scape pale yellow with brown apex, with short black setulae; pedicel dark brown, with short black setulae; first flagellomere black, flat and bare; antennal ratio 2.5: 1: 2. Proboscis black except basal ventral portion mostly yellowish brown, bare; palpus brown with very short pale setulae.

Thorax black with yellow spots. Setulae on thorax pale and dark brown; yellow areas with pale setulae. Propleuron pale yellow. Postpronotal lobe pale yellow. Mesoscutum with three isolated pale yellow lateral spots, anterolateral spot transverse and finger-like, midlateral spot onion-shaped, posterolateral spot triangular. Postalar callus yellow. Scutellum black with yellow posterior border bearing pale pile. Anepimeron with anterior portion dark brown and posterior portion yellow, posterior margin with pale setulae. Metasternum yellow with a wide black stripe on both sides.

Fore leg yellow except second to fifth tarsomeres brown; 6 dark brown dorsal setulae present at tip of fifth tarsomere. Mid coxa black with elliptical yellow anterior portion at apical 1/3; trochanter black; femur brown with yellow apex; tibia yellow; first tarsomere yellow, second to fifth tarsomeres brown to dark brown. Hind coxa black with anterolateral area yellow; trochanter black; femur brownish yellow; tibia yellow, tarsus dark brown. Claws shining black; pulvilli yellow. Setulae on legs mostly short and recumbent, those on black area black but those on yellow area yellowish brown. Hind tibia with three rows of black spine-like setae (6 ad, 6 av and 6 pv); mid and hind tarsi with black spine-like ventral setae.

Wing with pale smoky infuscation; veins brownish. Halter stem yellowish brown, knob black dorsally, ventral surface and margin pale yellow.

Abdomen yellow, tergite 1 black with anterior margin wider than scutellum; tergites 2–5 with dark brown mid-longitudinal stripes; tergite 6 to hypopygium dark brown. Petiolus formed from segments 2–4 and anterior part of segment 5; segments 5–8 inflated, ovate. Setulae on abdomen very short, recumbent and black, except tergite 1 with pale postero-lateral setulae, tergites 2–5 with pale setulae on yellow portions.

Male genitalia ( Figs. 16–21 ): Epandrium ( Fig. 16 ) as long as wide, with lateral margins convex; surstylus blackened and pointed apically; cercus in posterior view with outer margin arched, with inner margin nearly straight, with blackened tubercle widened near ventral end and situated at inner margin of cercus. Sternite 10 ( Fig. 17 ) V-shaped, darkened at middle, and with posterior margin gently concave. Gonocoxite ( Figs. 18–19 ) as long as wide, with large V-shaped basal incision; gonostylus ( Figs. 18–19 ) subtriangular, its tip tapering. Midposterior part of dorsal band protruded triangularly and blackened at apex; median epiphallic lobe divided into two log-like blackened lobes at apex, rugose except apical portions of paired lobes; paired lateral epiphallic lobe log-like, blackened at apex.

Female. Body length 20–23 mm, wing length 13–15 mm. Similar to male, apical black part of sternite 8 large and equilateral triangular ( Figs. 22–23 ).

Material examined. 1 male, 1 female, CHINA: Beijing, Wangershan (40°01’ N; 116° 15’ E), 16. VIII. 1986, Jinping Du; 56 males, 9 females, CHINA: Beijing, Wangershan (40°01’ N; 116° 15’ E), 16. VIII. 1986, 7. IX. 1987, Jinping Du; 1 male, 2 females, CHINA: Shandong, Jinan, Longdong (36°39’ N; 116°59’ E), 26. VIII. 1986, Shaokai Li; 3 males, CHINA: Beijing, Miaofengshan (39°58’ N; 116° 02’ E), 7. IX. 1987, Chi- Kun Yang.

Distribution. China (Beijing, Shandong).

Remarks. Systropus beijinganus was established by Du and Yang (2009) according to 61 male and 12 female specimens. After examination and comparison of the type series of S. beijinganus and the descriptions and figures of S. hoppo made by Nagatomi et al. (1991), no distinct differences from S. hoppo were found. Consequently, S. beijinganus is undoubtedly a new synonym of S. hoppo .

Figures

FIGURES 16 – 23. Systropus hoppo Matsumura, 1916. 16. Male genitalia, posterior view; 17. sternite 10; 18 – 19. gonocoxite and gonostylus, dorsal and lateral views; 20 – 21. phallus, dorsal and lateral views. Female. 22. Apical portion of sternite 8, ventral view; 23. apex of abdomen, lateral view.

FIGURES 40 – 42. Systropus hoppo Matsumura, 1916 (male). 40. Body, lateral view; 41. mesoscutum and scutellum, dorsal view; 42. metasternum, posteroventral view.