Cheilosia yunnanensis, Barkalov & Stahls, 2015

Barkalov, Anatolij V. & Ståhls, Gunilla, 2015, Descriptions of three new species of the genus Cheilosia Meigen from China (Diptera, Syrphidae), Zootaxa 3972 (2), pp. 280-290 : 285-287

Cheilosia (s. str.) yunnanensis Barkalov & Ståhls sp. n.

( Figs 2 B–E)

Type material. HOLOTYPE. ♀, China, Yunnan Province, Degin 28 km SE, 28.315°N 99.125°E, 3800 m above sea level, 21.06.2009, leg. Blank, Liston & Taeger. No 0 50 China. DNA voucher specimen MZH _ Y 1919, in MZH.

Diagnosis. The new species can be separated from all known Cheilosia species by following combination of characters: eyes with hairs, face without hairs, face not very strong protruded forward, scutellum without bristles, wing without dark spot, basoflagellomere yellow-brown, postpronotum mostly black, wings completely covered with microtrichia, eye-margins narrow.

Description. FEMALE. Body length: 9.8 mm, wing length 8.9 mm. Head. Face black, shiny on middle and with comparatively dense grey dusting on sides ( Fig. 2 B), without any hairs; eye-margins narrow brownish with white dusting and comparatively long white hairs; cheeks low, black with white dusting and long white hairs. Frons narrow, with 3 distinct longitudinal furrows, without dusting, covered with light-yellow hairs ( Fig. 2 C). Lunula bright-yellow, antennal pits distinctly separated. Antenna: scape and pedicel brownish with white dusting and hairs, basoflagellomere medium sized, with anterodorsal corners ( Fig. 2 D), yellow-brown; arista long, black, covered with very short hairs. Eyes covered with comparatively long and dense black hairs. Ocellar triangle slightly convex, broader than long, with long yellow hairs. Head posteriorly with dense silvery dusting, and yellowish hairs which becomes long and yellow on occiput. Thorax. Scutum and scutellum black, shiny, without dusting, covered with long, dense, wavy light-yellow hairs, without bristles. Postpronotum mostly black, with narrowly yellow hind margin, covered with grey dusting and yellow hairs. Pleura: black, covered with dense, long wavy white hairs; anterior anepisternum, katatergum and anatergum covered with grey dusting, other parts shiny; katepisternum covered with long whitish hairs (dorsal and ventral hair patches connected), anepisternum and katepisternum partly shining; metasternum with white hairs. Legs: femora shiny-black, with yellow tips, covered with long white hairs; tibia yellow in basal 1/3 and on tips and black on middle, hairs short, depressed white; mid tibia with row of black setae (ctenidium) apically; tarsi mostly black dorsally, only mid metatarsus yellow. Wings hyaline, completely covered with microtrichia, veins white-yellow at base of wing and brownish-black distally, inner angle between veins M1 and R4+5 almost equal 90° ( Fig. 2 E). Squama and halter white. Abdomen. Oval, the broadest part at the hind margin of tergum II, distinctly broader than scutum at level of wing base; black shiny, covered with erect white hairs, which are longer and wavy on sides of tergites I–III and shorter and erect on other parts. MALE. Unknown.

Etymology. The species is named after the type region, Yunnan Province.

Taxonomy. The taxon shares the following characters with taxa of nominative subgenus: antennal pits broadly separated, eyes covered with dense hairs, not very dense hairs on body and habitus is similar with other members of Cheilosia s. str. In the key to Chinese Cheilosia ( Barkalov & Cheng 2004) the new species keys out to couplet 99 and differs from other species as follows:

99. Scutum with black hairs or with a broad band of black hairs on hind half, eye-margins shiny without dusting...............

..................................................................................... C. kirgizorum Peck - Scutum with white hairs, some black hairs on sides, eye-margins with dense dusting............................... 100 100. Eye-margins very broad ( Fig. 2A )................................................. C. irregula Barkalov & Cheng - Eye-margins narrow ( Fig. 2 B)........................................................... C. yunnanensis sp. n.

Figures

FIGURE 2. A: Cheilosia irregula Barkalov & Cheng. B – E: Cheilosia yunnanensis sp. n. A & B: head laterally, C: head dorsally, D: antenna laterally, E: tip of wing.