Xylota umbrosa Violovitsh, 1975

Jeong, Soo-Hyun & Han, Ho-Yeon, 2019, A taxonomic revision of the genus Xylota Meigen (Diptera: Syrphidae) in Korea, Zootaxa 4661 (3), pp. 457-493 : 481-482

publication ID	https://doi.org/ 10.11646/zootaxa.4661.3.3
publication LSID	lsid:zoobank.org:pub:28EFDB26-4C37-4DA9-ABBB-122083EE396B
persistent identifier	https://treatment.plazi.org/id/5A219B24-345C-4721-FCED-FD919E5D108D
treatment provided by	Plazi
scientific name	Xylota umbrosa Violovitsh
status

Treatment

Xylota umbrosa Violovitsh View in CoL

(Korean name: bo-ra-gwang-taek-heo-ri-kkot-deung-e)

Figs 1A, B View FIGURE 1 , 2A, B View FIGURE 2 , 7 View FIGURE 7 A–I, 12E–H, 13A

Species new to Korea

Xylota umbrosa Violovitsh, 1975: 87 View in CoL (type locality: Russia, Siberia, S. Primorje; holotype ♂, ZISP); Violovitsh, 1983: 139 (in Siberian key); Mutin & Barkalov, 1999: 495, 497 (in Russian Far East key).

Diagnosis. Among Korean Xylota species, X. umbrosa is most similar to X. hauseri sp. n., especially having the purplish lustrous tinge on their black abdominal terga and the apex of the left arm of theca in male genitalia apicodorsally round. However, X. hauseri sp. n. can be distinguished from X. umbrosa by the following characters: 1) male abdomen more or less parallel-sided but never medially constricted ( Figs 2F View FIGURE 2 , 5A View FIGURE 5 ); 2) right lateral arm of theca apico-dorsally with finely serrated ( Fig. 12G View FIGURE 12 ). See also Diagnosis of X. hauseri sp. n.

Description of Korean material. MALE. Body length 11.6–13.8mm; wing length 9.0– 10.1mm. Head black ( Fig. 7F, G View FIGURE 7 ); face with dense white pollinosity without bare part; posterior 1/5 of frons anterior to eye contiguity with yellowish white pollinosity ( Fig. 1A View FIGURE 1 ); area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle) bare but posterior area covered with yellow pile ( Fig. 1A View FIGURE 1 ). Thorax entirely black; scutum subshiny black with appressed short yellow pile, but posterior half sparsely with longer erect brownish pile mixed with short pile; anterior anepisternum covered with white pollinosity; posterior anepisternum with white pile and white pollinosity; anepimeron covered with yellow pile; katepisternum moderately covered with yellowish white pollinosity, dorsal posterior area with white pile; notopleuron with yellow pile; scutal area anterior to wing base covered with black pile; postalar callus with yellow pile; metasternum bare with white pruionosity. Wing almost entirely with pale brownish tinge, pterostigma brown ( Fig. 7E View FIGURE 7 ); halter pale yellow. Legs: femora almost entirely black; tibiae dark brown to black with basal 1/3 yellow; pro- and mesotarsomere 1 and 2 yellow, tarsomere3 yellow and apical half dark brown, tarsomeres 4 and 5 black; metatrochanter ventrally with short and sharp calcar (subequal to basal width) ( Fig. 7C View FIGURE 7 ); apico-ventral 1/3 of metafemur with two carinae covered with spinose setulae, remaining ventral area with two irregular rows of spinose setae except for basal 1/5 (anterior row cover whole length but posterior row reach 2/3 length), antero-dorsally and postero-ventrally with long brown and white mixed pile, apico-dorsal 1/3 area with brown setulae; metatarsus dark brown to black ( Fig. 7C View FIGURE 7 ). Abdomen about 3.5x longer than wide; preabdominal dorsum with purplish lustrous tinge ( Figs 2A View FIGURE 2 , 7A View FIGURE 7 ); terga 2 and 3 almost parallel-sided ( Fig. 2A View FIGURE 2 ); tergum 2 and 3 with black appressed short black pile except laterally areas covered by white erect pile. Male genitalia ( Figs 12 View FIGURE 12 E– H, 13A): surstylus with dorsal lobe elongated about 1.5 x as long as ventral lobe, long finger shaped and slightly bent ventrally in lateral view, densely covered with setulae, right lobe basally thicken ( Fig. 12 View FIGURE 12 E–G); ventral lobe of surstylys widely bulged, apically with short setulae ( Fig. 12F, G View FIGURE 12 ); cercus cordated in profile with long pale pile ( Fig. 12 View FIGURE 12 E–G); lingula indistinct ( Fig. 13A View FIGURE 13 ); fenestra elliptic in outline ( Fig. 12F, G View FIGURE 12 ); spur of superior lobe reduced ( Fig. 13A View FIGURE 13 ); superior lobes asymmetrical ( Fig. 12F, G View FIGURE 12 ); right lateral arm of theca ( Fig. 12G View FIGURE 12 ) with two dorsal thorny processes with 3 pale pile in between, also with serrated apico-ventral area; left lateral arm of theca ( Fig. 12F View FIGURE 12 ) with baso-dorsal thorny process and apico-dorsally round apex and with 3 pale pile in between, also with apico-ventrally serrated area; aedeagus with ejaculatory hood medially with furrow in postero-ventral view, dorsally enlarged ( Fig. 12H View FIGURE 12 ); ejaculatory process short ( Fig. 12H View FIGURE 12 ); ejaculatory apodeme apically enlarged and bowl shaped.

FEMALE. Similar to male except for the following non-genitalic characters: Head ( Fig. 1B View FIGURE 1 ): frons with about anterior 1/3 shiny black and bare with posterior 2/3 shiny black and covered with yellowish pile, medially with pair of areas of white pollinosity, except for 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. 7D View FIGURE 7 ): metatrochanter without calcar. Abdomen ( Fig 2B View FIGURE 2 ) terga 2 and 3 posteriorly slightly widened.

Material examined. SOUTH KOREA: Gangwon-do : 1♂, Hoengseong Dunnae-myeon , Mt. Cheongtaesan Sapgyo-ri to 1200m peak, 5.VII.2003, DS Choi et al .; 1♂, Hongcheon Nae-myeon , Mt. Gyebangsan Undoryeong, 12.VIII.2008, SW Suk et al .; 1♂, Hongcheon-gun , Nae-myeon , Changchon-ri , North valley of Mt. Gyebangsan, 27.V.2007, HS Lee et al .; 1♀, Jeongseon-gun , Jeongseon-eup, Hoedong-ri, 37°25’59” N 128°33’49” E, 7. VI.2011, HS Lee, YB Lee, DH Kim; 1♂, Jeongseon-gun, Nam-myeon, Mt. Mindungsan from Yupyeong-ri to 1119m peak, 37°16’10” N 128°46’49” E, 31.V.2002, DS Choi and HW Byun ; 2♂, ditto, 31.V.2006, HY Han et al .; 8♂, ditto, 6. VI.2006, HY Han et al .; 1♂, ditto, 20. VI.2006, HY Han et al .; 1♂, ditto, 7.VII.2007, HY Han et al .; 1♂, ditto, 13. VI.2008, HS Lee et al .; 2♂, ditto, 27. VI.2008, JS Lim et al .; 1♂, ditto, 12.V.2012, HY Han et al .; 1♂, Samcheok Dogye-eup from Sinbangteo to Mt. Dohwasan, 925m, 1.VIII.2003, DS Choi et al .

Distribution. Korea (new record), Russian Far East.

Remarks. The Korean specimens agree with the original description ( Violovitsh, 1975) as well as the genitalic illustration by Mutin & Barkalov (1999).