Cheilosia pica, 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 : 86-90

Cheilosia pica sp. nov.

urn:lsid:zoobank.org:act:E8CD01BE-F303-461B-9588-2FE8FE5B5B65

Figs 48–49

Differential diagnosis

The species is a member of the nominotypical subgenus where it is close to the group of species near C. (C.) albohirta . In this group C. (C.) pica sp. nov. is close to C. (C.) difficilis , but differs by having femora anteriorly yellow in apical ⅓–½, and posteriorly black in basal ¾ (in C. difficilis femora are black, with only tips narrowly yellow), and completely different shapes of the hypandrial gonopods (superior lobes) of male terminalia.

Etymology

The specific epithet is from the Latin ‘ piceus ’, meaning ‘pitchblack’.

Material examined

Holotype NEPAL • ♂; Solukhumba , E of Pangkongma La; 27°34′ N, 86°45′ E; 3000 m a.s.l.; 17 May 1997; M. Hauser leg. [523]; CSCA.

Paratypes NEPAL • 9 ♀♀; same data as for holotype; CSCA • 1 ♀; Solukhumbu , Sanam; 27°27′ N, 86°53′ E; 2700–2800 m a.s.l.; 23 May 1997; M. Hauser leg. [532]; CSCA • 2 ♀♀; 28°00′ N, 85°00′ E; 9900 ft a.s.l.; 20 May 1967; Can. Nepal Exped.; Malaise trap 7; CNC • 1 ♂, 6 ♀♀; 28°00′ N, 85°00′ E; 11 400 ft a.s.l.; 21 May 1967; Can. Nepal Exped.; Malaise trap 3; CNC • 1 ♀; 27°58′ N, 85°00′ E; 11 100 ft a.s.l.; 25 May 1967; Can. Nepal Exped.; CNC • 1 ♂, 1 ♀; 27°58′ N, 85°00′ E; 10 500–11 100 ft a.s.l.; 26 May 1967; Can. Nepal Exped.; CNC • 1 ♀; 27°58′ N, 85°00′ E; 11 100 ft a.s.l.; 27 May 1967; Can. Nepal Exped.; Malaise trap 7; CNC • 1 ♀; 27°57′ N, 84°59′ E; 10 100 ft a.s.l.; 30 May 1967; Can. Nepal Exped.; Malaise trap 5; CNC • 1 ♀; 27°57′ N, 85°00′ E; 11 400 ft a.s.l.; 31 May 1967; Can. Nepal Exped.; Malaise trap 3; CNC • 4 ♂♂, 1 ♀; 28°00′ N, 85°00′ E; 10 500 ft a.s.l.; 1 Jun. 1967; Can. Nepal Exped.; Malaise trap 6; CNC • 1 ♀; 27°58′ N, 85°00′ E; 10 500 ft a.s.l.; 3–5 Jun. 1967; Can. Nepal Exped.; Malaise trap 1; CNC • 1 ♂; 28°00′ N, 85°00′ E; 10 500 ft a.s.l.; 27 May–2 Jun. 1967; Can. Nepal Exped.; Malaise trap 1; CNC .

Description

Male

LENGTH. Body 7.2–8.7 mm, wing 7–8.5 mm.

HEAD. Face black, moderately broad, shiny, with fine grey pollinosity laterally and dense pollinosity ventral to antenna, tip of facial tubercle and mouth edge shiny, without pollinosity; face long black pilose; facial tubercle large but not very broad; parafacia moderate in width, in broadest part slightly broader than half of basoflagellomere width, brownish, grey pollinose, with short yellow pilosity about same length as eye pilosity; gena narrow, black, grey pollinose and with comparatively short yellow pilosity; lower part of occiput densely grey pollinose and light-yellow pilose. Frons distinctly convex, black, shiny, with fine grey pollinosity and black pilosity; angle of approximation of eyes approximately right. Lunule brown, antennal pits broadly separated. Scape and pedicel brownish, basoflagellomere rounded, orange; arista long, brown in basal half and black in apical half, with very short pilosity. Eye completely covered with dense, pale pilosity; eye contiguity slightly longer than length of frons without lunule. Vertex inflated, covered with black pilosity, ocellar triangle isosceles. Occiput very narrow, with long black pilosity.

THORAX. Postpronotum black, brownish pollinose and yellow pilose. Scutum fine-punctured, black, completely brown pollinose; medially with erect, long yellow pilosity, laterally intermixed with long black pilosity, postalar callus with mixed pilosity and a few strong black bristles. Scutellum densely pollinose along anterior margin, otherwise slightly pollinose; black with yellow and black pilosity, hind margin with numerous long black bristle-like pilosity up to same length as length of scutellum; scutellar fringe long, yellow. Pleura shiny but grey pollinose and mainly yellow pilose; posterior anepisternum brownish pollinose, postero-dorsally with yellow and black pilosity; anepimeron yellow pilose, postero-dorsal part also with black pile; katepisternum with dorsal and ventral pile patches widely separated, dorsal pile patch with mixed yellow and black pilosity, ventrally only yellow pilose.

LEGS. Fore coxa without baso-lateral spur, black, with brownish tip, grey pollinose and pale pilose; mid and hind coxae black, yellow pilose; trochanters black; femora black with dorsal third yellow posteriorly, in anterior side yellow up to medial part of femora; long pilosity on posterior side of fore femur basally yellow, and black otherwise; long pilosity posteriorly on mid femur yellow, with some black pilosity near tip; long pilosity on ventral part of hind femur yellow; tibiae yellow with narrow black annulus medially, black annulus on hind tibia broader; tarsi with two basal segments of fore tarsi brownish dorsally, other segments black, three basal segments of mid tarsi yellow and others segments black, hind tarsi black dorsally, all tarsi ventrally yellow.

WING. Long, narrow, brownish, completely covered with microtrichia, inner angle between veins M 1 and R 4+5 right, Rs with a few yellow pile, sometimes non-pilose. Haltere yellow with black knob; calypter brownish.

ABDOMEN. Narrow, distinctly narrower than mesonotum at level of wing base, black, fine-punctured, brownish pollinose with shiny yellowish reflections laterally, yellow pilose, pilosity long erect laterally and shorter semi-erect medially, some black pilosity antero-laterally on tergite II and postero-laterally on III; posterior part of tergite IV and genitalia with black pilosity. Sternite I matte with erect yellow pilosity, sternites II–III shiny without any pollinosity, sternite II with erect yellow pilosity, sternite III with erect yellow pilosity laterally and with appressed short black pilosity medially; sternite IV with grey pollinosity and appressed short black pilosity.

Female

LENGTH. Body 5.3–7.7 mm, wing 5.7–7.2 mm.

HEAD. Facial tubercle small, face with scattered short, pale pilosity, medio-laterally with brown spot; parafacia narrow, brownish or yellow in lower part, with short yellow pile. Frons narrow, slightly broadened anteriorly, short erect yellow pilose, shiny with small spots of grey pollinosity near eyes; with three longitudinal furrows, the lateral furrows close to an eye, in anterior third there with a transversal furrow. Antenna and lunule yellow, basoflagellomere sometimes with blackish anterior margin. Vertex shiny, ocellar triangle equilateral.

THORAX. Postpronotum variable in colour from completely black to brownish in most part, yellow pilose and grey pollinose; scutum shiny on medial part, whitish-grey pollinose laterally, covered with short erect yellow pilosity; two black bristles on postalar calli; scutellum hind margin with black bristles.

LEGS. Fore coxa brownish-yellow; femora dark-brown to black in basal third to half, otherwise yellow; hind femur sometimes yellow also basally; tibiae completely yellow or yellow with narrow dark annulus medially; fore and mid tarsi yellow, with apical 4–5 segments dark, hind tarsus dorsally black, but segments 2–3 brown.

ABDOMEN. Oval, comparatively narrow, width of tergite II posteriorly equal to mesonotum width at level of wing base, shiny laterally and grey-brown pollinose medially on all tergites, covered with comparatively short white, erect pilosity laterally and short white and black adpressed pilosity medially. Other characters as in male.

Remark

The colour of the femora in the female varies from predominantly black to predominantly yellow.

Distribution

Nepal.

Figures

Fig. 48. Cheilosia (Cheilosia) pica sp. nov. A–B, E–H = holotype, ♂ (CSCA), C–D = paratype, ♀ (CNC). A. Head, lateral view. B, D. Antenna, lateral view of pedicel and basoflagellomere. C. Head, dorsal view. E. Surstylus and gonocercus, lateral view. F. Tip of wing. G. Superior lobe of hypandrium, lateral view. H. Aedeagus and aedeagal apodeme, lateral view. Scale bars indicated in drawings.

Fig. 49. Cheilosia (Cheilosia) pica sp. nov. A–B. Holotype, ♂ (CSCA); dorsal and lateral views. C–D. Paratype, ♀ (CNC); dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.