Xylota tarda Meigen

(Korean name: bae-mu-nui-heo-ri-kkot-deung-e)

Figs 1R, S, 2R, S, 6 O–W, 12A–D, 13H

Species new to Korea

Xylota tarda Meigen, 1822: 225 (type locality: Austria; type ♀, NMW); Hippa, 1968: 189 (taxonomic discussion and illustra- tion); Hippa, 1978: 64 (taxonomic discussion); Violovitsh, 1986: 140 (in Siberian key); Mutin & Barkalov, 1999: 492, 497 (in Russian Far East key with illustration); Speight, 1999: 216, 217 (in European key); Vujić & Milankov, 1999: 124, 126 (in key of Balkan peninsula); Stubbs & Falk, 2002:336, 440 (color illustration); Bartsch et al., 2009: 416 (color illustration and diagnosis).

Xylota arboris He & Chu, 1992:5 (type locality: Heilongjiang, Ningan; holotype ♂, SAC); Mutin & Gilbert 1999: 53 (new synonym of X. tarda); Huang & Cheng, 2012: 681 (diagnosis with illustration).

Diagnosis. This species can be readily distinguished from the other Korean Xylota species by the following characters: 1) terga 2 and 3 each with a pair of large orange-yellow maculae almost touching each other (Figs 2R, S, 6O, P); 2) the area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle in male and small area immediately anterior to ocellar triangle in female) bare (Fig. 1R, S); 3) scutal area anterior to wing base with yellow pile; and 4) anterior 2/3 of anterior anepisternum bare. See Diagnosis of X. abiens .

Description of Korean material. MALE. Body length 9.3mm; wing length 6.62mm; dark brown to black species with pale orange-yellow abdominal maculae. Head black (Fig. 6T, U); face with dense yellow pollinosity; posterior half of frons anterior to eye contiguity with yellowish pollinosity (Figs 1R, 6T, U); area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle) bare but posterior area covered with yellow pile (Fig. 1R). Thorax entirely black; scutum subshiny black, covered with short appressed yellow pile; anterior 2/3 of anterior anepisternum bare and posterior 1/3 covered with yellowish pollinosity; posterior anepisternum with yellowish pollinosity and white pile (upper 1/2 mixed with yellowish pile); anepimeron covered with white pile; katepisternum moderately covered with white pollinosity, dorsal posterior area with white pile; notopleuron with yellow pile; scutal area anterior to wing base with yellow with few black pile mixed; postalar callus with yellow pile; metasternum almost bare with white pollinosity. Wing entirely with pale brownish tinge, pterostigma pale brown (Fig. 6O); halter with basal 1/3 of stem dark brown but posterior stem and knob yellow. Legs: femora almost entirely dark brown to black; pro- and mesotibiae yellow and subapico-ventral 3/5 dark brown; pro- and mesotarsomeres 1–3 yellow, tarsomeres 4 and 5 brown; metatrochanter ventrally with short calcar (subequal to basal width) (Fig. 6Q); apico-ventral 1/3 of metafemur with two carinae covered with spinose setulae, remaining ventral area with irregular smaller spinose setae except for basal 1/5, antero-dorsally and postero-ventrally with long whitish yellow pile, apico-dorsal 1/3 area with short and dark brown pile; metatibia dark brown and basal 1/3 yellowish brown; metatarsomeres 1 and 2 dorsally dark brown and apico-ventrally brownish yellow (Fig. 6Q); tarsomere 3 dorsally dark brown and ventrally brownish yellow; tarsomere 4 and 5 black (Fig. 6Q, R). Abdomen about 3.5x longer than wide (Figs 2R, 6O), terga 2 and 3 almost parallel-sided but with slightly widened posterior (Figs 2R, 6O); preabdominal terga dark brown in ground color; tergum 2 with pair of large reddish yellow maculae covering almost 60–80% of tergum with their posterior half almost touching each other and anterior half cut away as inverted triangular shape; tergum 3 with pair of square reddish yellow maculae covering about anterior half of tergum, almost touching each other. Male genitalia (Figs 12 A–D, 13H): surstylus with dorsal lobe, elongated about 1.5x as long as ventral lobe, long finger shaped and slightly bent ventrally in lateral view, densely covered with spinose setulae (Fig. 12 A–C); ventral lobe of surstylus blunt but distinctly projected with apex setulose (Fig. 12B, C); cercus cordated in profile with long pale pile (Fig. 12 A–C); lingula indistinct (Fig. 13H); fenestra small and elongated elliptic (Fig. 12B, C); spur of superior lobe reduced (Fig. 13H); superior lobes almost symetrical (Fig. 12B, C); lateral arms of theca elongated and crooked down with blunt apex, apico-dorsally round and bulged with small spinose pile, dorsally with few denticles in varying size (Fig. 12B); aedeagus with ejaculatory hood medially with furrow in postero-ventral view, dorsally round; ejaculatory process short (Fig. 13H); ejaculatory apodeme apically enlarged and bowl shaped.

FEMALE. Similar to male except for the following non-genitalic characters: Head (Fig. 1S): frons with about anterior 1/3 shiny black and bare with posterior 2/3 shiny black and covered with whitish yellowish pile, medially with pair of areas of yellowish pollinosity except for medially narrow longitudinal bare area; area anterior to ocellar triangle (small area immediately anterior to ocellar triangle) bare but posterior area covered with yellow pile. Leg (Fig. 6R): metatrochanter without calcar. Abdomen (Fig. 6P): terga 2 and 3 posteriorly widen.

Material examined. SOUTH KOREA: Gangwon-do: 1♂, Samcheok-si, Hajang-myeon, Mt. Jungbongsan N37°26’19” E128°55’34”, 8.IX.2008, YB Lee et al .; 1♀, Hongcheon-gun, Nae-myeon, Changchon-ri, North valley of Mt. Gyebangsan, 14.VIII.2009, JM Jung and YB Lee .

Distribution. Korea (new record), Russia (From Altay to Kuril Isles), widely distributed in whole Europe.

Remarks. The genitalic structures of the Korean male (Figs 12C) agree with the illustration of Hippa (1968) as well as the illustrations and description by Stubbs & Falk (2002) and Bartsch et al. (2009). Xylota tarda seems to be closely related to X. filipjevi (see Remarks for the latter species).