Cheilosia pernigra, 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 : 84-86

Cheilosia pernigra sp. nov.

urn:lsid:zoobank.org:act:FA888367-1677-47AC-919B-7AF365B3D85F

Figs 46C–D , 47

Differential diagnosis

Cheilosia (Montanocheila) pernigra sp. nov. is most similar to C. (M.) brevimontana . It differs by having yellowish pilosity on tarsi, hind femur, ventral part of anepisternum and katepisternum, while C. (M.) brevimontana sp. nov. has only black pilosity on legs and pleura.

Etymology

The specific epithet is from the Latin ‘ per-niger ’, meaning ‘completely black’ and refers to the colour of the species.

Material examined

Holotype NEPAL • ♀; Prov. Nr. 3, East Dingpoche ; 4400 m a.s.l.; 3 Jun. 1964; W. Dierl leg.; ZSMC.

Description

Female

LENGTH. Body 8.5 mm, wing 7.7 mm.

HEAD. Face broad, distinctly broadened ventrally, shiny brown with dense, grey pollinosity ventral to antennal base and slight pollinosity laterally, non-pilose; facial tubercle small and rather narrow. Parafacia broad, broader than ½ basoflagellomere width, shiny black with fine grey pollinosity in ventral half, with moderately long, fine, black and yellow pilosity; gena broad, dorsally with fine grey pollinosity, long yellowish and black pilose. Frons moderately broad, almost parallel sided in posterior ⅔ and distinctly broadened in anterior ⅓, with three distinct furrows; brownish medially and black laterally; with moderately long black and yellow pilosity; lunule brownish, posterior margin darker, antennal pits broadly separated. Antenna black, scape and pedicel shiny, basoflagellomere comparatively oval, with brownish postero-ventral part, densely grey pollinose; arista moderately long, shiny, black, bare. Eye entirely with dense, long, brownish pilosity, paler in ventral half. Vertex moderately inflated, grey dusted with long, black and some shorter yellow pilosity, ocellar triangle isosceles. Occiput posteriorly covered with black and yellow pilosity.

THORAX. Postpronotum black, shiny anteriorly and pollinose posteriorly, with black and yellow pilosity. Scutum fine-punctured, shiny black with bluish reflection, with two stripes of grey pollinosity medially, with short, semi-erect yellow and 4× longer black erect pilosity, no lateral black bristles on scutum. Scutellum with fine brownish pollinosity, with short yellow and long black pilosity, hind margin with long, black pilosity, lacking distinct bristles. Subscutellar fringe long, yellow. Pleura black, with brownish pollinosity and long yellow and black pilosity, dorsal and ventral pile patches on katepisternum separated posteriorly, metasternum with some yellow pilosity.

LEGS. Mainly black, only knees slightly brownish; fore coxa without baso-lateral spur; fore and mid femur posteriorly with long, black pilosity, antero-ventrally black pilosity mixed with a few yellow pile.

WING. Translucent with brownish veins; entirely microtrichose; Rs with a few brownish, short pile; vein M 1 meeting R 4+ 5 in an acute angle. Haltere brownish, knob black. Calypter grey, with brown rim and fringe of white pilosity.

ABDOMEN. Narrow, in broadest part equal in width to scutum at level of wing base; shiny, black; medially with brownish pollinosity; yellow pilose, pilosity long, erect laterally and short semi-erect or appressed pilosity medially; postero-lateral corners of tergites IV–V with a few long black pile. Sternites black, finely brown pollinose; pilosity yellow, mixed long erect and short semi-appressed; hind margins of sternites IV–V also with black semi-appressed pilosity.

Male

Unknown.

Distribution

Nepal.

Figures

Fig. 46. A–B. Cheilosia (Montanocheila) nigella sp. nov., holotype, ♂ (NME); dorsal and lateral views. – C–D. Cheilosia (Montanocheila) pernigra sp. nov., holotype ♀ (ZSMC); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.

Fig. 47. Cheilosia (Montanocheila) pernigra sp. nov., holotype, ♀ (ZSMC). A. Head, dorsal view. B. Pedicel, basoflagellomere and arista, lateral view. Scale bars indicated in drawings.