Cheilosia leucozonoides, 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 : 66-69

Cheilosia leucozonoides sp. nov.

urn:lsid:zoobank.org:act:BEED388F-15FA-4176-97A0-3FBD85867296

Figs 35–36

Differential diagnosis

Cheilosia (Floccocheila) leucozonoides sp. nov. is a large sized species with long and dense body pilosity like most subcongeners. From all other members of the subgenus C. (F.). leucozonoides sp. nov. differs by the following combination of characters: eye pilosity black, basoflagellomere blackish in colour, and presence of black pile on tergites III–IV.

Etymology

The specific epithet ‘ leucos ’ is from the Greek, and refers to the pale wing veins of the species.

Material examined

Holotype NEPAL • ♀; 27°57′ N, 84°59′ E; 10 100 ft a.s.l.; 30 May 1967; Can. Nepal Exped.; Malaise trap; CNC.

Paratypes NEPAL • 1 ♀; 27°57′ N, 84°59′ E; 10 500 ft a.s.l.; 14–21 May 1967; Can. Nepal Exped.; Malaise trap; CNC • 1 ♀; Prov. Nr 2, East Thodun ; 3200 m a.s.l.; 14–21 Apr. 1964; W. Dierl leg.; ZSMC • 1 ♀; 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 11.9–12.6 mm, wing 10.9–11.4 mm.

HEAD. Face very broad, in anterior view distinctly widened ventrally; densely grey pollinose and microtrichose except tip of facial tubercle and a broad shiny stripe from parafacia to oral margin; non-pilose; facial tubercle small, laterally compressed; parafacia very broad, about as broad as ⅔ of basoflagellomere width, brownish or blackish with greyish-yellow pilosity and very fine, long, black pilosity, also some yellow pilosity on dorsal part; gena broad, densely, grey pollinose and long, yellow pilose, with some black pilosity anteriorly; ventral to eye a brown macula and dense, yellow pollinosity. Frons broad, distinctly broadened anteriorly, with two distinct lateral furrows, medial furrow invisible, in medial ⅓ with narrow band of grey pollinosity, covered with dense, long, erect black or black and yellow pilosity; lunule narrow, brown or yellow; antennal pits separated. Antenna black, basoflagellomere big, rounded, with small brown macula on ventro-dorsal part, covered with dense, yellow-brown pollinosity; arista long, bare, black. Vertex slightly inflated, with fine grey pollinosity and with long black and yellow pilosity. Ocellar triangle equilateral. Eye with dense, long pilosity, dorsally black and ventrally brown. Occiput with only yellow pilosity.

THORAX. Postpronotum black, densely, grey pollinose and yellow pilose. Scutum fine-punctured, black with dense, grey pollinosity in anterior ⅓ (anterior to transverse suture) and shiny with bluish reflection in posterior ⅔, covered with dense, long pilosity, yellow in anterior part and near scutellum, and with short band of long, black pilosity between wings, no lateral black bristles; scutellum only with long, dense, yellow pilosity. Subscutellar fringe long, dense, yellow. Pleura black with dense, yellowish-grey pollinosity and long, dense, yellow pilosity; dorsal and ventral hair patches on katepisternum dorsally connected; metasternum with dense, long, yellow pilosity.

LEGS. Fore coxa black, with grey pollinosity and yellow or black and yellow pilosity; fore coxa without lateral spur; tibia brownish black with paler basal ⅓ and tip; tarsi black; femora black with yellow tips, fore and mid femora posteriorly with mainly long yellow pilosity and with variable amount of black pilosity in apical part, hind femur with antero-ventral yellow pilosity very long, about 1.5× the width of femur, and shorter black pilosity of variable lengths (not longer than yellow pile).

WING. Entirely microtrichose, yellowish in basal part and medially with distinctly infuscated (brownish) wing veins and stigma; tibia brownish black with paler basal ⅓ and tip; tarsi black. Rs along all length with many short, black pile; inner angle between veins M 1 and R 4+5 right. Haltere brownish with black pilosity, calypter brownish with brown rim and yellow fringe.

ABDOMEN. Oval, distinctly broader than scutum at level of wing base, black with dense, grey pollinosity on tergites I–II and shiny black otherwise, covered with long, dense, erect pilosity, yellow on tergites I–II and black on tergites III–V. Sternites with pilosity as on tergites.

Male

Unknown.

Distribution

Nepal.

Figures

Fig. 35. Cheilosia (Floccocheila) leucozonoides sp. nov., holotype, ♀ (CNC). A. Head, lateral view. B. Antenna, lateral view of pedicel and basoflagellomere. C. Wing. Scale bars indicated in drawings.

Fig. 36. Cheilosia (Floccocheila) leucozonoides sp. nov. A–B. Holotype, ♀ (CNC); dorsal and lateral views. C–D. Paratype, ♀ (CSCA); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.