Cheilosia collis, Barkalov & Ståhls, 2022

Barkalov, Anatolij V. & Ståhls, Gunilla, 2022, Cheilosia (Diptera, Syrphidae: Rhingiini) of Nepal with descriptions of 29 new species, European Journal of Taxonomy 829 (1), pp. 1-127 : 27-28

Cheilosia collis sp. nov.

urn:lsid:zoobank.org:act:9CC7B676-AF13-446C-9B1D-0C5341B1B92B

Fig. 10C–D

Differential diagnosis

Cheilosia (Floccocheila) collis sp. nov. differs from all known members of Floccocheila by the combination of the following characters: basoflagellomere brownish-orange, face without pilosity, scutum yellowish pilose with a broad transverse band of black pilosity of different lengths at level of wing bases, scutellum yellowish pilose with an area of black pilosity centrally, and pleura and abdomen densely yellow pilose. Cheilosia (F.) collis sp. nov. is similar to the Nepalese species C. (F.) illustratoides sp. nov. and C. (F.) leucozonoides sp. nov., from which it differs in having tergite III with only yellow pilosity (vs tergite III laterally with black pilosity in C. (F.) illustratoides sp. nov. and black pilose in C. (F.) leucozonoides sp. nov.).

Etymology

The specific epithet is from the Latin ‘ collis ’ meaning ‘hill’.

Material examined

Holotype NEPAL • ♀; Solukhumbu above Pangum; 27°34′ N, 86°45′ E; 2900–3000 m a.s.l.; 16 May 1997; M. Hauser leg. [522]; CSCA.

Description

Female

LENGTH. Body 11.9 mm, wing 11.8 mm.

HEAD. Face very broad, in anterior view distinctly broadened ventrally, black, non-pilose; densely grey pollinose except tip of facial tubercle, with longer microtrichia medio-laterally and with shiny stripes lacking pollinosity ventrally; facial tubercle well-developed, rather narrow; parafacia very broad, in broadest part about equal to ½ width of basoflagellomere, densely yellowish-grey pollinose along eye and long, yellow pilose; gena broad, densely grey pollinose and long yellow pilose, with a brown macula ventral to eye. Frons rather narrow, distinctly broadened anteriorly, densely yellow pilose, with distinct lateral furrows and almost invisible central furrow, in anterior ⅓ with a narrow, transverse stripe of grey dusting; lunule brown; antennal pits distinctly separated. Antenna: scape and pedicel shiny black, mostly black pilose, pedicel ventrally also with some yellow pile, basoflagellomere orange-brown, darker in antero-dorsal part, densely grey pollinose; arista long, shiny-black with short pile. Eye completely covered with long, dense, yellow pilosity. Vertex convex, grey pollinose and yellow pilose, ocellar triangle equilateral.

THORAX. Postpronotum densely pollinose, yellow pilose. Scutum fine-punctured, densely grey pollinose on anterior ⅓ anterior to transverse suture, along suture and on scutum hind margin anterior to scutellum, medially shiny with bluish reflection; pilosity erect, long, dense yellow, also with short and 2× longer black pilosity on area between wing bases, no black bristles laterally; scutellum with narrow stripe of pollinosity anteriorly and otherwise shiny without pollinosity, with erect, shorter black and longer yellow pilosity; scutellum hind margin without black bristles. Subscutellar fringe with yellow, long, dense pile. Pleura black, grey pollinose, denser on dorsal part, with long, dense, pale-yellow pilosity, posterior anepisternum dorsally without black bristles; long yellow pilosity on katepisternum confluent; metasternum long, yellow pilose.

LEGS. Fore coxa without baso-lateral spur; black; grey pollinose and yellow pilose; femora shiny black with yellow tips; long pilosity of fore femur completely yellow, mid femur ventrally with black pilosity in apical half, hind femur antero-ventrally with long yellow pilosity 2× as long as width of femur, basally a few long black pile, ventrally short black pilose, in apical ⅕ with short black pile dorsally; tibia mainly black, fore tibia and hind tibia basally yellow in ⅓ and at tip, mid tibia yellow on basal ⅖ and on tip; fore and hind tarsi black dorsally and yellow ventrally, mid tarsi with segments 1–3 yellow, segment 4 brown and segment 5 black.

WING. Completely microtrichose, translucent, veins brown and basal part with yellow veins; Rs with comparatively dense and long yellow pile; inner angle between veins M 1 and R 4+5 right. Haltere with yellow stem and black knob; calypter yellowish with yellow rim and fringe.

ABDOMEN. Broadly oval, black, tergites I–II grey pollinose, with long, dense, yellow, erect pilosity, tergites III–IV antero-laterally also with a patch of black pile. Sternites I–II densely pollinose with long, erect yellow pilosity, III–IV weakly pollinose, shiny, with long erect and shorter semi-adpressed yellow pilosity, mixed with short, semi-appressed to appressed black pilosity, hind margin of sternite IV with almost only short, appressed black pile.

Male

Unknown.

Distribution

Nepal.

Figures

Fig. 10. A–B. Cheilosia (Montanocheila) brevimontana sp. nov., holotype, ♀ (ZSMC); dorsal and lateral views. – C–D. Cheilosia (Floccocheila) collis sp. nov., holotype, ♀ (CSCA); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.