Key to the known species of the genus Cerodontha in China

(Referenced from Spencer 1987; Boucher 2010; Lonsdale and von Tschirnhaus 2021).

1 First flagellomere with short spine or projection at anterodistal corner (Fig. 2 C); scutellum only with apical scutellar setae (Fig. 2 E) (subgenus Cerodontha) 2 – First flagellomere normal, sometimes enlarged in male (Fig. 6 B); scutellum with both lateral and apical scutellar setae 6 2 Frons with 1 ori and 2 ors 3 – Frons with 3–4 ori and 2 ors 4 3 Mesonotum shining black, acr in 2 rows (Fig. 4 D); a slight fracture separated distiphallus from mesophallus, and distiphallus with white subapical circle and tiny brown protrusion pointed apically in lateral view (Fig. 4 G) C. (C.) fulvipes – Mesonotum matt grayish-black or yellow centrally and adjoining scutellum, acr absent; distiphallus confluent with mesophallus, and distiphallus big trumpet-shaped in lateral view (Spencer 1976: fig. 319) C. (C.) denticornis 4 Scutellum yellow in the middle (Fig. 2 E); distiphallus gourd-shaped with enlarged apex and complete ventral opening (Fig. 2 H, L) C. (C.) flavicornis – Scutellum entirely black; distiphallus not as above 5 5 Mesonotum with acr in irregularly in 4 or 5 rows; wing with ultimate section of M 4 equal to penultimate section; r-m before middle of discal cell; distiphallus half length of mesophallus (Spencer 1976: fig. 315) C. (C.) hennigi – Mesonotum with acr in 8 rows; wing with ultimate section of M 4 slightly longer than penultimate section; r-m at middle of discal cell; distiphallus> 2 × as long as mesophallus (Sasakawa 1996: fig. 24 A, B) C. (C.) fujianensis 6 Lunule distinctly higher than wide (Boucher 2010: figs 6 a, b, 7) 7 – Lunule distinctly wider than high (Boucher 2010: fig. 5) 8 7 Lunule broad, slightly higher than wide, gradually tapering to a point dorsally, or becoming narrow from the middle to dorsal half and blunt on top (Boucher 2010: fig. 7); mesoscutum with a pair of prescutellar setae; surstylus and sometimes lower margin of epandrium with strong setae or spines (subgenus Butomomyza) 9 – Lunule narrow, higher than wide, sometimes sunken beneath prominent orbital plates (Boucher 2010: fig. 6 a, b); mesoscutum without a pair of prescutellar setae; surstylus usually without strong setae or spines (sometimes with bulges or fine setulae) (subgenus Poemyza) 10 8 Head usually with frons, lunule, face, or gena bright yellow; ocellar triangle extended anteriorly beyond level of ors; first flagellomere not enlarged in males (subgenus Icteromyza) 18 – Head usually mostly brown or partially yellowish-brown (usually not bright yellow); ocellar triangle shorter, not extended beyond level of ors; first flagellomere often enlarged in males (subgenus Dizygomyza) 24 9 Legs black, only with fore knees yellow, middle knees narrowly yellowish and all tarsi yellowish brown; distiphallus with distal two thirds of distiphallus bifid (Sasakawa 1963 a: fig. 12) C. (B.) cornigera – Legs brownish black, all knees yellowish brown; distiphallus not bifid (Chen and Wang 2003: fig. 4) C. (B.) fujianica 10 Frons uniformly brown to black 11 – Frons or fronto-orbital plate at least partially yellow 14 11 Mesonotum without presutural dorsocentral seta 12 – Mesonotum with a presutural dorsocentral seta 13 12 Abdominal tergite 6 with 2 large yellowish lateral spots in dorsal view (Zlobin 1993 a: fig. 71); distiphallus with a pair of short tubules fused at the middle, below the base with a pair of sclerotized plates (Zlobin 1993 a: fig. 70) C. (P.) oryziphila – Abdominal tergite 6 brownish yellow on posterior margin, but no lateral spots in dorsal view; distiphallus dilated without tubules (Sasakawa 1961: fig. 49) C. (P.) bisetiorbita 13 Legs black, only with fore knees yellow; distiphallus with tubules trumpet-shaped at apex. (Spencer 1976: fig. 343) C. (P.) incisa – Legs black, but all femora at distal 1 / 6 and all knees yellow; distiphallus with tubules dilated slightly at distal 1 / 3 (Fig. 14 I, M) C. (P.) beigerae 14 Notopleuron yellow (Fig. 2 D) 15 – Notopleuron brown (Fig. 16 F) 16 15 Fronto-orbital plate shining black below anterior ors; epandrium with a dorsal process in lateral view (Spencer 1976: fig. 338) C. (P.) lateralis – Fronto-orbital plate mostly yellow; epandrium without dorsal process (Spencer 1976: fig. 341) C. (P.) superciliosa 16 Wing with r-m at middle of discal cell; distiphallus with distal tubules rotated to right (Spencer 1976: fig. 335) C. (P.) muscina – Wing with r-m distinctly before middle of distal cell; distiphallus not as above 17 17 Calypter yellowish, margin and fringe brown; gena very narrow, ~ 1 / 11 height of eye; femora black, all knees distinctly yellow; distiphallus with dense ventral setulae and bifurcated at apex in lateral view (Sasakawa 1972: fig. 20) C. (P.) hirta – Calypter, margin and fringe yellowish white; gena ~ 1 / 5 height of eye; femora black but yellow at least at distal 1 / 3; distiphallus fused to mesophallus, and distiphallus without ventral setulae (Spencer 1990: fig. 1392) C. (P.) setariae 18 Femora entirely yellow C. (I.) piliseta – Femora mostly black and yellow distally 19 19 Wing with ultimate section of vein M 4 shorter than penultimate section C. (I.) nigricoxa – Wing with ultimate section of vein M 4 equal to or longer than penultimate section 20 20 Antenna and palpus black; sum of the lengths of mesophallus and distiphallus ~ 6 × as long as the basiphallus (Sasakawa 2008: fig. 1) C. (I.) alishana – Antenna and palpus partially or entirely yellow to dark brown; sum of the lengths of mesophallus and distiphallus ~ 3–5 × as long as the basiphallus 21 21 Fronto-orbital plate entirely brown; distiphallus with a big curve in lateral view 22 – Fronto-orbital plate yellow but brown in upper half; distiphallus more straight (Fig. 12 I, L) 23 22 Distiphallus with tubules distinctly longer than that in C. (I.) rishi (Spencer 1961: fig. 44) C. (I.) duplicata – Distiphallus with C-shaped curve (Garg 1971: fig. 7 e) C. (I.) rishii 23 Antennal first flagellomere brown; surstylus with 3 or 4 spines on inner margin C. (I.) geniculata – Antennal first flagellomere yellow; surstylus with 10 spines on inner margin C. (I.) taipingensis 24 Legs black with all knees bright yellow 25 – Legs yellow at least with hind knees black 26 25 Lunule yellow with variable brown (Fig. 6 C, D); mesonotum with a pair of prescutellar setae; tubules of distiphallus with deep basal curve and not recurved apically (Fig. 6 I) C. (D.) flavilunulata sp. nov. – Lunule velvety grayish; prescutellar setae absent; distiphallus with shallow basal curve but more recurved apically (Lonsdale 2021: figs 533, 534) C. (D.) morosa 26 Abdominal tergites entirely black without narrow yellow posterior margin 27 – Abdominal tergites with 1–6 yellowish posterior margin (Fig. 9 F) 29 27 Mesoscutum with a pair of prescutellar setae; calypter margin and fringe light yellow; distiphallus thin, conspicuously longer than mesophallus (Spencer 1976: fig. 379) C. (D.) caricicola – Mesoscutum without prescutellar setae; calypter yellowish, margin or fringe brown; distiphallus not as above 28 28 Mid tibia with one posterodorsal seta; wing with ultimate section of M 4 shorter than penultimate section C. (D.) vietnamensis – Mid tibia without posterodorsal seta; wing with ultimate section of M 4 equal to or slightly longer than penultimate section C. (D.) omissa 29 Calypter, margin and fringe whitish yellow; tubules of the distiphallus with black subapical circle in lateral view (Nowakowski 1973: fig. 165; Černý 2010: fig. 45) C. (D.) luctuosa – Calypter yellowish, margin light brown, fringe brown; distiphallus with distal tubules sclerotized uniformly 30 30 Lunule and parafacial broad, distinctly projecting above frons (Fig. 10 B); gena with the highest point located at the rear (Fig. 11 B) C. (D.) tumefacta sp. nov. – Lunule at least not projecting above frons (Fig. 9 B); gena with the highest point located in the middle (Fig. 8 B) 31 31 Frons dark brown in the center; antenna with arista thickened on basal half; gena brownish yellow in the center and dark brown on both sides; distiphallus ~ 2.5 × longer than mesophallus and yellowish brown at apex in lateral view (Fig. 9 K, L); surstylus with 5 thick spines on inner margin (Fig. 9 H) C. (D.) labradorensis – Frons yellowish brown in the center; antenna with arista thickened on basal 1 / 4; gena yellowish brown; distiphallus ~ 1.5 × longer than mesophallus and dark brown at apex in lateral view (Fig. 8 H, K); surstylus with ~ 25 short and thick spines (Fig. 8 I) C. (D.) granditerga sp. nov.