Leptodromia castanea, Barros & Sinclair & De Freitas-Silva & Ale-Rocha, 2024

Barros, Luana M., Sinclair, Bradley J., De Freitas-Silva, Rafael A. P. & Ale-Rocha, Rosaly, 2024, Revision of the genus Leptodromia Sinclair & Cumming, 2000 (Diptera: Hybotidae: Ocydromiinae), with the description of six new species, Records of the Australian Museum 76 (3), pp. 133-150 : 139

Leptodromia castanea

Barros & Sinclair sp. nov.

urn:lsid:zoobank.org:act:4553368A-BCEE-415B-A2E0-AB98C8F52938

Figs 9–10 , 42

Diagnosis. Antenna with postpedicel elongate, with stylus longer than half-length of postpedicel. Scutum yellow, with pair of black stripes on prescutellar disc; pleura dark, except proepisternum; scutellum, mediotergite and laterotergite brown. Legs yellow, with brown subapical band on hind femur. Abdomen dark, with yellowish band on posterior margin of tergites, without dark medial stripe.

Description. Holotype male ( Fig. 9 ). Body length: 3.5 mm. Wing length: 3.3 mm. Head. Ocellar triangle shiny, not protuberant, with pair of short, slender proclinate ocellar setae and pair of shorter posterior setae. Frons shiny, dark brown with pruinosity on lower half. Face with dense grey microtrichia. Antenna brown, except inner margin of scape and pedicel paler and shiny; postpedicel elongate, covered with dense brown microtrichia; arista-like stylus brown, with microtrichia, more than half length of postpedicel. Proboscis yellowish; palpus oval, yellow, covered with dense yellow pruinosity and long, slender yellow setae. Occiput shiny brown ( Fig. 10 ); two rows of short, slender yellow setae, 1 row postoculars and 1 row occipital, lower setae longer. Thorax. Antepronotum brown, with row of short, slender yellow setae. Scutum yellow, except for two black stripes on prescutellar disc ( Fig. 10 ). Scutellum brown; mediotergite and laterotergite brown, yellowish above halter. Pleura dark, brown, except proepisternum yellow. Wing. Broad, membrane hyaline; pterostigma pale, elongated and narrow, situated at apex of cell c. Cell dm more than 3 times longer than wide; M 1 short, extending less than halfway to wing margin; M 2 and M 4 reaching wing margin; CuA+CuP long, curved, not reaching wing margin. Halter whitish yellow. Legs. Yellow, except tarsi brownish, increasingly darker apically. Mid and hind tarsomeres 3–5 slightly broader than fore tarsomeres, ventrally flattened. Hind femur with brown subapical band ( Fig. 9 ). Fore femur with anteroventral row of long slender setae. Mid and hind femora with anteroventral and posteroventral row of pale setae; apex with preapical anterodorsal seta. Mid and hind tibiae with 1 basal anterodorsal seta; mid tibia with 1 anterodorsal and 1 posterodorsal seta near mid-length; hind tibia with 1 anterodorsal seta near mid-length. Abdomen ( Fig. 9 ). Brown, posterior margins of tergites with pale band, broader laterally. Male terminalia: not dissected. Female. Similar to male, except abdominal tergites with pale medial stripe. Female terminalia: not dissected.

Type material. Holotype ♂, labelled: “NSW: nr Gloucester Tops [32°04'S 151°35'E]; 14-19-xi-1988 / el. 1290m; D.Bickel / Nothofagus for.”; “Australian Museum/ K 603840”; “ HOLOTYPE / Leptodromia / castanea / Barros & Sinclair [red label]” ( AMS) . Holotype in good condition. Paratypes: Australia. New South Wales: same data as holotype (1 ♀ K 603842, AMS) .

Distribution. This species is known only from Nothofagus forest above 1200 m on Gloucester Tops, New South Wales ( Fig. 42 ).

Etymology. From Latin “ castaneus ” (brown), in reference to the brown colour of the pleura.

Figures

Figure 42. Geographical records of Leptodromia Sinclair & Cumming, 2000.

Figures 9–10. Leptodromia castanea sp. nov. male holotype. (9) Lateral habitus; (10) Scutum, dorsal view.