Xylota orientiflorum sp. n.

(Korean name: dong-yang-kkot-heo-ri-kkot-deung-e)

Figs 1Q, 2Q, 5 O–S, 11A–D, 13F

Diagnosis. This species can be readily distinguished from the other Korean Xylota species by the following characters: 1) two small orange-yellow maculae on tergite 2; 2) two widely rectangular maculae on tergite 3; 3) area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle in male and small area immediately anterior to ocellar triangle in female) covered with yellowish pile (Fig. 1Q); and 4) scutal area anterior to wing base with black pile. See also Diagnosis of X. abiens .

Description. MALE. Body length 12.3–13.8mm; wing length 8.5–9.0mm. Head black; face with dense white pollinosity (Fig. 5R, S); posterior 1/3 of frons anterior to eye contiguity with yellowish white pollinosity (Figs 1Q, 5R, S); area anterior to ocellar triangle (vertical triangle anterior to ocellar triangle) covered with yellowish pile (Fig. 1Q). Thorax entirely black; scutum subshiny black with appressed short yellow pile, but posterior half sparsely with longer erect white pile mixed with short pile; anterior anepisternum covered with yellowish pollinosity; posterior anepisternum with yellow and apically curly pile and dense yellowish white pollinosity; anepimeron covered with yellow pile; katepisternum moderately covered with whitish yellow pollinosity, dorsal posterior area with yellow pile; notopleuron covered with yellow pile; scutal area anterior to wing base with black pile; postalar callus mainly covered with long yellow pile and anterior proximal portion with few black pile; metasternum with yellowish white pruionosity. Wing almost entirely with pale brownish tinge (Fig. 5O), pterostigma brown; halter with basal half of stem dark brown but posterior stem and knob yellow. Legs: femora black; tibiae dark brown to with basal 1/3 pale yellow; pro- and mesotarsomeres 1 and 2 yellow, tarsomere 3 yellow but dorsal half brown, tarsomeres 4 and 5 dark brown to black; metatrochanter with elongated and sharp calcar (at least twice as long as basal width) (Fig. 5P); apico-ventral 1/3 of metafemur with two carinae covered with spinose setulae, remaining ventral area with few spinose setae, antero-dorsally and postero-ventrally with long yellow pile but apico-dorsal 1/4 area black setulae; metatarsomeres 1–3 yellowish brown, tarsomeres 4 and 5 dark brown to black (Fig 5P). Abdomen about 3.5x longer than wide (Figs 2Q, 5O), almost parallel-sided but slightly broaden medially, with posteriorly widened tergum 2 (Figs 2Q, 5O); preabdominal terga black in ground color; tergum 2 medialy with pair of relatively small roundish orange-yellow maculae, separated from each other roughly by diameter of each macula (Figs 2Q, 5O); tergum 3 with pair of larger subrectangular maculae, separated from each other by about 1/3 width of each macula (Figs 2Q, 5O). Male genitalia (Figs 11 A–D, 13F): 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 short setulae (Fig. 11 A–C); ventral lobe of surstylus bulged widely with apex setulose, (Fig. 11 A–C); cercus cordated in profile with long pale pile (Fig. 11 A–C); lingula indistinct (Fig. 13F); fenestra round in outline (Fig. 11 A–C); spur of superior lobe reduced (Fig. 13F); superior lobes asymmetric(Fig. 11 A–C); right lateral arm of theca (Fig. 11C) apically with large ventrally hooked process, apico-ventrally with eaqually large ventrally hooked process but with additional tooth dorso-subapically; left lateral arm of theca (Fig. 11B) apico-dorsally round and ventrally three denticles; aedeagus with ejaculatory hood medially with furrow in postero-ventral view, dorsally round (Fig. 11D); ejaculatory process short (Fig. 11D); ejaculatory apodeme apically enlarged and bowl shaped.

FEMALE. Unknown.

Type material. HOLOTYPE: ♂, South Korea, Gyeongsangnam-do, Yangsan-si, Ungsang-eup, Simyangsa, N35°23‘38“ E129°11‘32“, 6.VII.2008, DS Choi (NIBR) . PARATYPES. 1♂, South Korea, Jeollanam-do, Gwang- yang-si, Ongnyong-myeon, Mt. Baegunsan from jinteul, N35°6‘23“ E127°37‘17“, 23. VI .2015, Y.B. Lee et al. (YSUW); 1♂, Gyeongsangnam-do, Yangsan-si, Yongdanag-dong, Mt. Daeunsan, N35°24‘06“ E129°12‘48“, 3.VII.2009, HS Lee et al. (NIBR) .

Distribution. Korea.

Remarks. Among about 10 Palaearctic Xylota species with yellow pattern on tergum 2 and 3, this new species appears unique in having a pair of relatively small orange-yellow maculae of tergum 2 as well as a pair of larger subrectangular maculae on the tergum 3 (Figs 2Q, 5O). Its male genitalic characteristics (especially the large ventrally hooked process on apex of right leteral arm of theca; Fig. 11C) further support the new species status.

Etymology. The specific epithet is an adjective derived from the Greek ‘ orienti’, meaning eastern, and the Greek ‘ florum’, meaning flower. It is named because this species is similar to the European X. florum (Fabricius, 1805) .