Cerodontha (Poemyza) beigerae Nowakowski, 1972

Figs 14 A – O, 15 A – K

Cerodontha (Poemyza) beigeri Nowakowski, 1972: 742 (holotype and paratype).

Cerodontha (Poemyza) beigerae: Nowakowski 1973: 87; Zlobin 1986: 85; 1993 a: 121; 2005, 179; Spencer 1990: 367; Černý and van Zuijlen 2022: 86.

Specimens examined.

China, Inner Mongolia, Genhe City, Mangui Town, the northern primitive forest region of Greater Khingan Mountains: • 2 ♂♂ (IMAU), Wulonggan forestry center at 4217 meters, unburned area, Larix gmelinii, malaise trap 13 (three meters above the ground), 52°47'05.26"N, 120°53'40.10"E, 789 m, 28. VII. 2022, leg. Rui Ma, Qin-Jianrong Liu ; • 2 ♂♂ (IMAU), Wulonggan forestry center near impounding reservoir, unburned area, Pinus sylvestris var. mongholica, malaise trap 19 (three meters above the ground), 52°47'47.98"N, 120°55'03.45"E, 816 m, 28. VII. 2022, Rui Ma, Qin-Jianrong Liu ; • 3 ♂♂ (IMAU), Wulonggan Forestry center near impounding reservoir, unburned area, Pinus sylvestris var. mongholica, Malaise trap 20 (one meter above the ground), 52°47'47.98"N, 120°55'03.45"E, 816 m, 13. VII. 2022, leg. Li Shi, Zhi-Wei Wang, Rui Ma ; • 1 ♂ (IMAU), Wulonggan forestry center at 4207 meters, burned area in 2007, Pinus sylvestris var. mongholica, malaise trap 17 (three meters above the ground), 52°51'53.10"N, 120°58'55.80"E, 823 m, 28. VII. 2022, leg. Rui Ma, Qin-Jianrong Liu ; • 1 ♂ (IMAU), Changliangbeishan houdu, burned area in 2002, Pinus sylvestris var. mongholica, malaise trap 6 (one meter above the ground), 52°26'01.00"N, 120°56'53.20"E, 985 m, 14. VII. 2022, leg. Li Shi, Zhi-Wei Wang, Rui Ma ; • 1 ♂ (IMAU), Aba River First Branch Line, unburned area, Betula platyphylla, malaise trap 38 (one meter above the ground), 52°12'20.10"N, 120°29'04.90"E, 919 m, 29. VII. 2022, leg. Rui Ma, Qin-Jianrong Liu ; • 1 ♀ (IMAU), Yanling Road, burned area in 2007, Pinus pumila, malaise trap 22 (one meter above the ground), 28. VII. 2022, leg. Rui Ma, Qin-Jianrong Liu ; • 1 ♂ (IMAU), Wulonggan forestry center near impounding reservoir, unburned area, Pinus sylvestris var. mongholica, malaise trap 20 (one meter above the ground), 52°47'47.98"N, 120°55'03.45"E, 816 m, VII. 2022, leg. Rui Ma, Qin-Jianrong Liu ; • 1 ♀ (IMAU), Changliangbeishan houdu, burned area in 2002, Larix gmelinii, malaise trap 2 (one meter above the ground), 52°25'31.24"N, 120°54'15.76"E, 1032 m, 28. VII. 2022, leg. Rui Ma, Qin-Jianrong Liu ; • 1 ♂ (IMAU), Aba River First Branch Line at the end of the Tower Road, unburned area, Pinus sylvestris var. mongholica, malaise trap 40 (one meter above the ground), 52°13'23.30"N, 121°22'46.80"E, 742 m, 29. VII. 2022, leg. Rui Ma, Qin-Jianrong Liu ; • 1 ♂ (IMAU), Aba River First Branch Line at the end of the Tower Road, unburned area, Pinus sylvestris var. mongholica, malaise trap 39 (three meters above the ground), 52°13'23.30"N, 121°22'46.80"E, 742 m, 14. VII. 2022, leg. Li Shi, Zhi-Wei Wang, Rui Ma ; • 1 ♂ (IMAU), Aba River Third Branch Line, unburned area, Larix gmelinii, malaise trap 29 (three meters above the ground), 52°18'40.00"N, 121°22'48.60"E, 629 m, 28. VII. 2022, leg. Rui Ma, Qin-Jianrong Liu ; • 1 ♂ 1 ♀ (IMAU), Aba River Third Branch Line, burned area in 2018, Pinus sylvestris var. mongholica, malaise trap 36 (one meter above the ground), 52°21'07.00"N, 121°27'05.30"E, 646.3 m, 28. VII. 2022, leg. Rui Ma, Qin-Jianrong Liu ; • 1 ♂ (IMAU), Aba River Third Branch Line, burned area in 2018, Larix gmelinii, malaise trap 32 (one meter above the ground), 52°19'54.70"N, 121°25'38.40"E, 615 m, 14. VII. 2022, leg. Li Shi, Zhi-Wei Wang, Rui Ma ; • 2 ♂♂ (IMAU), Aba River Third Branch Line, burned area in 2018, Larix gmelinii, malaise trap 31 (three meters above the ground), 52°19'54.70"N, 121°25'38.40"E, 651 m, 28. VII. 2022, leg. Rui Ma, Qin-Jianrong Liu . DNA sequence number PX 103173 from GenBank.

Diagnosis.

Frons not projecting above eye in lateral view, ~ 0.8 × as wide as eye and not parallel-sided in dorsal view. Fronto-orbital plate moderately shiny and inner margin yellow, ~ 1 / 2 width of frons; two ori inclinate and two ors reclinate. Lunule yellowish brown, the width equal to the height. Mesonotum with 1 + 3 dc and acr in six irregular rows. Legs dark brown, all femora yellow at distal 1 / 6. Wing with ultimate and penultimate sections of M 4 in proportion of 1.4: 1. Calypter yellow, margin and fringe yellow. Mesophallus oval at apex and swollen on apical 2 / 5; distiphallus curved conspicuously and fused to mesophallus at base, with tubules dilated slightly at distal 1 / 3.

Redescription.

Male (Fig. 14 A – O). Body length 1.7–1.9 mm; Wing length 1.9–2.3 mm. Female (Fig. 15 A – K). Body length 2.0– 2.3 mm; Wing length 2.2–2.4 mm.

Head (Fig. 14 C, D) brown. Frons not projecting above eye in lateral view, ~ 0.8 × as wide as eye, not parallel-sided in dorsal view; fronto-orbital plate moderately shiny and inner margin yellow, ~ 1 / 2 width of frons; two ori inclinate and two ors reclinate; orbital setulae reclinate or erect in a single row; inner vertical setae surrounded by yellow coloration; outer vertical setae on brown background. Ocellar triangle yellow on anterior margin, ocellar setae and posterior ors equal in length. Lunule yellowish brown, the width equal to the height. Antennal first flagellomere ovate; arista with microscopic pubescence. Gena brownish yellow, ventral edge black, and ~ 1 / 5 height of eye. Clypeus yellow; palpus brown with three setae at apex.

Thorax matt black (Fig. 14 E, F). Mesonotum with 1 + 3 dc, acr in six irregular rows; two postsutural intra-alar, one presutural and two postsutural supra-alar setae. Notopleuron yellowish brown. Anepisternum pale yellow on dorsal and posterior margin, with one strong anepisternal seta and eight short setulae. Katepisternum with one strong seta and four short setulae. Scutellum pale brown in the middle in dorsal view. Legs dark brown, all femora yellow at distal 1 / 6. Wing: Costa with 2 nd (between R 1 and R 2 + 3), 3 rd (between R 2 + 3 and R 4 + 5) and 4 th (between R 4 + 5 and M 1) sections in proportion of 4.0: 1.6: 1; ultimate and penultimate sections of M 1 in proportion of 2.5: 1; r-m at middle of discal cell; ultimate and penultimate sections of M 4 in proportion of 1.4: 1. Calypter yellow, margin and fringe yellow. Halter yellowish white.

Abdomen (Fig. 14 G) brown, tergites 1–6 with narrow yellow posterior margin. Genitalia (Fig. 14 H – O): epandrium with a pair of distinctly claviform processes; surstylus with three or four short setae on inner margin; mesophallus oval at apex and swollen on apical 2 / 5; distiphallus curved conspicuously and fused to mesophallus at base, with tubules dilated slightly at distal 1 / 3; ejaculatory apodeme narrow, blade margin clear, sperm pump pale but base of duct lightly pigmented.

Female. Notopleuron brown. Abdominal tergites 1–6 with especially narrow yellow posterior margin (Fig. 15 F). Genitalia (Fig. 15 G – K): two spermathecae unequal in size and circular and truncated at basal 1 / 5; spermathecae ducts long and curved basally; ventral receptacle symmetrical, oval-shaped at the bottom in ventral view; proctiger slightly sclerotized. Cercus with fine apical setulae.

Distribution.

Palaearctic: Belgium, China (Inner Mongolia) #, Czech Republic, Germany, Hungary, Mongolia, North Korea (Černý 2007), Netherlands (Černý and van Zuijlen 2022), Poland, Russia, Slovakia, Sweden, Switzerland.

Remarks.

This species is very similar to C. (P.) imbuta from the Palaearctic region in the following characteristics: frons dark brown, not projecting above eye; fronto-orbital plate broadening anteriorly; lunule high and narrow; anepisternum black except dorsal margin yellow; legs dark brown with all knees yellow. But it can be differentiated in that the calypter margin and fringe are yellow, the distiphallus has the tubules dilated slightly at distal 1 / 3 and more curved than that of C. (P.) imbuta . In C. (P.) imbuta, the calypter is yellow with the margin and fringe are brownish black; the tubules of the distiphallus are dilated at distal 1 / 4 and slightly constricted in the middle (Zlobin 1993 a: fig. 55; Nowakowski 1973: fig. 124).