Dialineura nigrofemorata Kroeber , 1937

Liu, Si-Pei & Yang, Ding, 2012, Revision of the Chinese species of Dialineura Rondani, 1856 (Diptera, Therevidae, Therevinae), ZooKeys 235, pp. 1-22 : 10-11

Dialineura nigrofemorata Kroeber, 1937 Figs 435573

Dialineura nigrofemorata Kröber, 1937: 272, 290. Type locality: Transbaibalia, Russia (Holotype deposited in Naturhistorisches Museum Wien, Vienna); Zaitzev 1971: 192.

Dialineura intermedia Lyneborg, 1968: 159. Type locality: District SE, Baikal Lake, Russia.

Diagnosis.

Male mesonotum with 3 wide black vittae separated by 2 narrow pale grey stripes. Pterostigma of wing yellow. Fore femur only with white pile. Male subepandrial sclerite very long; gonocoxite narrow apically and with substylus in interior margin.

Redescription.

Male. Body length 8.2 mm, wing length 7.0 mm.

Head (Fig. 43) with dense pale pubescence over black ground color, central upper area of frons brown. White to pale yellow pile from gena to occiput, black setae on ocellar tubercle and frons, setae on frons divided into 2 tufts, parafacial bare, upper occiput also with some black postocular setae. Eyes reddish brown and nearly contiguous on upper frons. Antenna with dense pale pubescence over black ground color, except first flagellomere and style brown; black setae on scape long and thick, but those on pedicel short and thin, first flagellomere nearly bare; central part of first flagellomere widest; style resting apically on first flagellomere with a tiny distal spine; antennal ratio: 3.6: 1.0: 3.5: 0.9. Proboscis black with short brown pile; palpus brown with white pile.

Thorax with dense pubescence over black ground color; mesonotum (Fig. 44) with 3 wide black vittae separated by 2 narrow pale grey stripes. Notum with sparse white pile, prosternum and pleuron with white to pale yellow pile; macrosetae on thorax black. Scutal chaetotaxy (pairs): np 3, sa 2, pa 1, dc 1, sc 2. Coxae and trochanters pale pollinose over black ground color, femora with pale pubescence over black ground color except apices brownish yellow, tibiae brownish yellow with dark brown apices, all tarsomeres 1 brownish yellow with dark brown apices, other tarsomeres dark brown. White pile present on coxae and femora, setae on legs black. Fore coxa with a 1, av 1; mid coxa with a 3; hind coxa with a 3, d 1. Fore and mid femora without any prominent setae; hind femur with av 7, pv 8. Fore tibia with ad 4, pd 5-6, pv 4-6, apically with 6 setae; mid tibia with ad 5, pd 5, av 4, pv 4, apically with 7 setae; hind tibia with ad 9, pd 10-11, av 9-10, pv 7, apically with 6 setae. Wing (Fig. 46) hyaline tinged yellow; pterostigma very narrow, yellow, at end of R1; veins brown except basal surface of wing pale yellow. Halter stalk brownish yellow basally and black apically; knob brown.

Abdomen with dense pubescence over ground color, except tergite 1 and anterior margins of tergites 2-3 with very thin pubescence so that ground color is visible, posterior margin of each segment pale yellow. White pile on abdomen and terminalia. Male genitalia: Epandrium (Fig. 51) elongated, 1.3 times longer than wide, apically narrowed with a triangular medial invagination. Subepandrial sclerite slightly constricted in the central area, nearly 3 times longer than cercus. Gonocoxite (Fig. 52) narrow apically and with substylus in interior margin. Distiphallus (Figs 53-55) short and curved, basal part of distiphallus relatively stout.

Female. Unknown.

Material.

1 male, CHINA: Liaoning, Xinbin (41°43'N, 125°02'E), 7. VII. 2005, Juan Li.

Distribution.

Palaearctic region: China (Liaoning) (Fig. 73), Russia. In China, this is biogeographically part of Northeast Region ( Zhang 1999).

Remarks.

Kröber (1937) first described a female specimen of Dialineura nigrofemorata from Transbaibalia, Russia. Lyneborg (1968) described this species as Dialineura intermedia and gave the figures of male genitalia. Zaitzev (1971) redescribed Dialineura nigrofemorata , gave the figures of male genitalia and revised Dialineura intermedia Lyneborg, 1968 as a synonymy, and he pointed out that the Dialineura nigrofemorata described by Lyneborg (1968) in fact was Dialineura lyneborgi . We newly record Dialineura nigrofemorata from China. This species is similar to Dialineura lyneborgi Zaitzev from Russia in the long subepandrial sclerite. But it can be separated from the following features: only white pile present on the fore femur (Fig. 45); the epandrium is nearly 2 times longer than the subepandrial sclerite. In Dialineura lynebo rgi, black pile distinctly present on fore femur; the epandrium is 1.5 times longer than the subepandrial sclerite ( Zaitzev 1971).