Cheilosia maculata, 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 : 71-74

Cheilosia maculata sp. nov.

urn:lsid:zoobank.org:act:8209AF68-052A-46CB-8501-F15B7143C151

Figs 39–40

Differential diagnosis

The new species belongs to the nominal subgenus ( Cheilosia s. str.), where it is close to Cheilosia (Cheilosia) albohirta Hellén, 1930 , from which it differs as follows: frons shiny, with stripes of grey pollinosity adjacent to eye, basoflagellomere orange, with dark antero-dorsal margin, pleura with some black pile and long black bristles. In C. albohirta the frons is densely grey pollinose, basoflagellomere black with reddish postero-ventral corner and pleura only whitish pilose.

Etymology

The specific epithet is from the Latin ‘ macula ’ and means ‘spotted’, referring to the lateral greyish maculae of abdominal tergites.

Material examined

Holotype NEPAL • ♂; Prov. Nr. 3, East Khumjung ; 3800 m a.s.l.; 24 May 1964; W.D. Dierl leg.; ZSMC.

Paratypes NEPAL • 1 ♂; Prov. Nr. 3, East Dingpoche ; 4600 m a.s.l.; 3 May 1964; W.D. Dierl leg.; ZSMC • 1 ♂; Gosainkunde ; 13 800 ft a.s.l.; 27 Jun. 1967; Can. Nepal. Exped.; CNC .

Description

Male

LENGTH. Body 8.5–8.6 mm, wing 7.4–7.8 mm.

HEAD. Face broad, in lateral view moderately protruded forwardly; blackish brown, black pilose and slightly grey pollinose except for facial tubercle and mouth margin; facial tubercle small; parafacia comparatively broad, clearly broader than half of the width of basoflagellomere, blackish brown, densely silvery pollinose and short white pilose; gena black or brown, comparatively broad, finely white pollinose, with moderately long white pilosity; lower part of occiput densely white pollinose and silvery white pilose. Frons convex, shiny, with stripes of grey pollinosity adjacent to eye, black pilose; frontal angle distinctly obtuse. Lunule yellow, antennal pits broadly separated. Antennae: scape and pedicel brown, basoflagellomere orange, with darker antero-dorsal margin, rounded to squarish; arista long, yellow, bare. Eye with dense, long, yellow pilosity; eye contiguity 1.3–1.5 times as long as length of frons without lunule. Vertex flat, covered with long black pilosity; ocellar triangle equilateral; dorsal part of occiput very narrow, blackish, pilosity long black and short yellow.

THORAX. Postpronotum black with brown posterior angle, grey pollinose and black pilose. Scutum and scutellum smooth, densely grey pollinose, medially with longitudinal stripes of brown pollinosity; scutum covered with comparatively long, black and yellow pilosity, postalar callus with long yellow and black pilosity and one stronger, long black bristle; pilosity on scutellum longer, on hind margin many long bristle-like pile, as long as or slightly longer than length of scutellum; subscutellar fringe long, yellow. Pleurae densely grey pollinose; anepisternum with mixed black and yellow pilosity, posteriorly mainly black pilose and with one or few stronger black bristles; anepimeron with mixed yellow and black pilosity, pile is apically wavy; katepisternum white pilose with dorsal and ventral pile patches well separated; metasternum white pilose.

LEGS. Coxae brown, white pollinose and white pilose, metacoxa posteriorly also with a few black pile, fore coxa without baso-lateral spur; femora black with yellow extreme tips, fore femur posteriorly with long black pilosity, basally with some white pilosity; mid femur posteriorly with long white pilosity in basal ⅖ and black pilosity otherwise; metafemur with long white antero-ventral pilosity and with a tuft of long, black pilosity antero-dorsally. Tibiae yellow with broad brown annulus medially; tarsi dorsally brown and ventrally yellow.

WING. Narrow, pale-brown, veins darker, completely microtrichose; inner angle of M 1 and R 4+5 acute, Rs non-pilose. Haltere yellow with black knob; calypter white, with white fringe.

ABDOMEN. Black, narrow, in broadest part narrower than scutum at level of wing base, pollinose; tergites I–IV brownish with shiny macula with bronze tinge antero-laterally; tergites white pilose, long erect on sides of tergites and appressed medially; lateral margins of tergite I and tergite IV laterally and posteriorly with erect black pilosity. Sternites with grey pollinosity and white pilose. Pre-genital segments black pilose.

Note: The paratypes differ slightly from the holotype as follows: frons completely covered with fine grey pollinosity; gena and lower part of occiput brownish; scutum without brownish pollinosity in posterior half. In one paratype fore coxa yellowish.

Female

Unknown.

Distribution

Nepal.

Figures

Fig. 39. Cheilosia (Cheilosia) maculata sp. nov., holotype, ♂ (ZSMC). A. Head, lateral view. B. Antenna, lateral view of pedicel and basoflagellomere. C. Tip of wing. D. Surstylus and gonocercus, lateral view. E. Aedeagus and aedeagal apodeme, lateral view. F. Superior lobe of hypandrium, lateral view. Scale bars indicated in drawings.

Fig. 40. Cheilosia (Cheilosia) maculata sp. nov., holotype, ♂ (ZSMC); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.