Cerodontha (Dizygomyza) flavilunulata sp. nov.

Figs 6 A – O, 7 A – K

Type material.

China, Inner Mongolia, Genhe City, Mangui Town, the northern primitive forest region of Greater Khingan Mountains: Holotype. • ♂ (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 . Paratypes. • 5 ♂♂ (IMAU), same data as for holotype; • 1 ♀ (IMAU), Wulonggan forestry center at 4217 meters, unburned area, Larix gmelinii, malaise trap- 14 (one meter above the ground), 52°47'05.26"N, 120°53'40.10"E, 789 m, 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 19 (three meters above the ground), 52°47'47.98"N, 120°55'03.45"E, 816 m, 28. VII. 2022, leg. Rui Ma, Qin-Jianrong Liu ; • 1 ♂ (IMAU), Aba River Third Branch Line, unburned area, Pinus sylvestris var. mongholica, malaise trap 34 (one meter above the ground), 52°22'00.00"N, 120°27'07.00"E, 659 m, 28. VII. 2022, leg. Rui Ma, Qin-Jianrong Liu ; • 1 ♂ (IMAU), Changliangbeishan near stock ground, unburned area, Pinus pumila, malaise trap 10 (one meter above the ground), 52°28'55.60"N, 121°02'40.50"E, 937 m, 28. VII. 2022, leg. Rui Ma, Qin-Jianrong Liu ; • 2 ♂♂ (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 . DNA sequence number PX 103169 from GenBank.

Diagnosis.

Frons mostly yellow with variable black stripes and spots at levels of between posterior ori and posterior ors. Lunule mostly yellow with brown upper margin, sometimes mostly brown with tiny yellow spots, wider than high. Mesonotum with gray pruinosity and a pair of prescutellar setae. Legs brown, all femora yellow on apical 1 / 6, all knees yellow, and all tibiae yellow on basal 1 / 7. Calypter and margin yellow, fringe yellowish white. Abdomen brown, tergites 1–6 yellowish on posterior and lateral margin. Distiphallus with subparallel S-shaped tubules.

Description.

Male (Fig. 6 A – O). Body length 1.9–2.1 mm; wing length 2.1–2.5 mm. Female (Fig. 7 A – K). Body length 2.1 mm; wing length 2.3 mm.

Head (Fig. 6 B – D) mostly yellow. Frons with grayish pruinosity, variable black stripes and spots at levels of between posterior ori and posterior ors, and frons projecting above eye in lateral view, ~ 0.9 × as wide as eye in dorsal view; fronto-orbital plate dark yellow and slightly shiny, becoming brown beyond posterior ors, and ~ 1 / 3 width of frons; two inclinate ori and two reclinate ors surrounded by brown coloration; orbital setulae sparse, reclinate in a single row. Ocellar triangle black, ocellar setae distinctly longer than posterior ors. Lunule mostly yellow with brown upper margin (Fig. 6 C), sometimes mostly brown with tiny yellow spots (Fig. 6 D), wider than high. Antenna brownish black, first flagellomere enlarged with brownish pubescence; arista conspicuously thickened on basal 1 / 4–1 / 3. Face brown, facial keel broad between antennae. Gena narrow, dark yellow, ~ 1 / 5 eye height. Clypeus pale yellow, palpus brown.

Thorax (Fig. 6 E, F) black. Mesonotum with gray pruinosity and moderately shiny, but yellow at posterolateral corner of postpronotum; 1 + 3 dc, acr in six irregular rows, a pair of prescutellar setae, two postsutural intra-alar, one presutural and two strong postsutural supra-alar setae on dark brown background. Notopleuron brown except for pale yellow at posteroventral corner. Anepisternum dark brown except for yellow dorsal margin, with one strong anepisternal seta and 7–9 short setulae. Katepisternum black with one strong katepisternal seta and four short setulae. Legs brown, all femora yellow on apical 1 / 6, all knees yellow, all tibiae yellow on basal 1 / 7, and all tarsi yellowish brown. 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 5: 1.6: 1; ultimate and penultimate sections of M 1 in proportion of 2.2: 1; r-m slightly beyond middle of discal cell; ultimate and penultimate sections of M 4 in proportion of 1.6–1.1: 1. Calypter and margin yellow, fringe yellowish white. Halter yellowish white.

Abdomen (Fig. 6 A, H) brown, tergites 1–6 yellowish on posterior and lateral margin. Genitalia (Fig. 6 I – O): epandrium with a pair of long claviform processes in posterior view; surstylus with nine long spines in inner margin; mesophallus paler, dilated at apex, with ventral edge curved obviously; distiphallus with long subparallel S-shaped tubules, basal curve deep and not recurved apically; ejaculatory apodeme symmetrical, blade brownish, stem dark; sperm pump pale but base of duct lightly pigmented.

Female (Fig. 7 A – K). Lunule narrower than that of the male. First flagellomere not as large as that of male (Fig. 7 B, C). Abdomen brown, tergites 1–7 yellowish on posterior and lateral margin. Other external characteristics same as the male except for the female terminalia. Terminalia (Fig. 7 G – K): spermathecae (Fig. 7 I) blackish brown, mushroom-shaped; spermathecal duct wide, weakly sclerotized with wavy lines; ventral receptacle symmetrical with wide stem; proctiger constricted medially in lateral view. Cercus well-sclerotized.

Distribution.

China (Inner Mongolia).

Etymology.

The specific name compounds the Latin prefix flavi - (meaning yellow) and the Latin noun lunulata (meaning lunule), referring to the mostly yellow lunule.

Remarks.

The new species is similar to C. (D.) morosa from the Palaearctic, Nearctic, and Oriental regions in the following characteristics: wing with ultimate section of M 4 slightly longer than penultimate section; calypter margin and fringe pale yellow or white; legs with all knees yellow; epandrium with a pair of long claviform processes in posterior view. But it can be distinguished by the following characteristics: the frons being yellow having grayish pruinosity, variable black stripes and spots at levels of between posterior ori and posterior ors; the fronto-orbital plate being dark yellow and slightly shiny, becoming brown beyond posterior ors; the lunule being mostly yellow with brown upper margin, sometimes mostly brown with tiny yellow spots; the mesonotum having a pair of prescutellar setae; the tubules of the distiphallus having deep basal curve and not recurved apically. In C. (D.) morosa, the frons is dark brown to black; the fronto-orbital plate is dark brown, but sometimes brown with darker pigment reduced to the posterolateral vestige; the lunule is smooth and velvety grayish; the mesonotum has acr in four rows; the prescutellar setae are absent; the distiphallus has shallow basal curve but more recurved apically (Spencer 1976; Lonsdale 2021).