Cheilosia picta, 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 : 90-93

Cheilosia picta sp. nov.

urn:lsid:zoobank.org:act:C78023C7-20E9-463B-A012-51EB1D0D78DB

Figs 50–51

Differential diagnosis

Cheilosia (Montanocheila) picta sp. nov. is similar to C. (M.) albipicta sp. nov., for distinguishing characters see under that species.

Etymology

The specific epithet is from the Latin ‘ pictus ’, meaning ‘colourfully painted’, referring to the body pilosity pattern.

Material examined

Holotype NEPAL • ♂; 27°58′ N, 85°00′ E; 11 100 ft a.s.l.; 18 May 1967; Can. Nepal Exped.; CNC.

Paratypes NEPAL • 1 ♀; 27°58′ N, 85°00′ E; 11 400 ft a.s.l.; 31 May 1967; Can. Nepal Exped.; CNC • 1 ♀; Prov. Karnali, Umgebung Churta ; 2900–3500 m a.s.l.; 18/19 May 1995; J. Weipert leg.; IBSJW / NME .

Description

Male

LENGTH. Body 11 mm, wing 10 mm.

HEAD. Face broad, distinctly broadened ventrally, black, without distinct pilosity; grey pollinose with longer microtrichia latero-medially, and with a shiny non-pollinose stripe latero-ventrally at mouth margin; facial tubercle small but distinct; parafacia very broad, equal to or somewhat broader than width of basoflagellomere, shiny black and slightly pollinose, with stripe of denser grey pollinosity along eye, with very long yellow pilosity clearly longer than eye pile; gena broad, densely grey pollinose and long, densely yellow pilose, with small, brown fascia ventral to eye. Frons convex, black, finely grey pollinose, denser near eye, dense black pilose; frontal angle distinctly obtuse; lunule yellow, narrowly connected with process of face and antennal pits thus narrowly separated. Scape and pedicel black, basoflagellomere with antero-dorsal angle, orange with darkened antero-dorsal part; arista black, long, with very short pilosity. Eye pilosity long, dense, yellow, postero-medially with bare stripe; length of eye contiguity distinctly shorter than length of frons without lunule. Occiput shiny-black, with comparatively short, black pilosity; ocellar triangle isosceles. Vertex yellow pilose.

THORAX. Postpronotum black, grey pollinose and yellow pilose. Scutum grey pollinose on anterior third and anterior to scutellum, densely pollinose on notopleural area, with long, dense pilosity, area between wingbases shiny and only slightly pollinose with a stripe of black pilosity extending across scutum, lacking strong black bristles on lateral parts; scutellum mostly with black pilosity, anterior margin with grey pollinose stripe and yellow pilosity, hind margin with long mixed yellow and black pilosity about as long as scutellum length, lacking strong bristles. Pleura black, grey pollinose, with brown spots on anteriodosal corner of katepisternum and on anterior part of katepimeron; posterior anepisternum and anepimeron with mixed, long, black and yellow pilosity, anterior anepisternum non-pilose, katepisternum completely with long, yellow pilosity. Metasternum yellow pilose.

LEGS. Fore coxa without baso-lateral spur, black, grey pollinose and yellow pilose; femora black, densely grey pollinose, long pilosity on posterior part of fore and mid femora black, hind femur anteriorly and ventrally with long yellow pilosity up to 2× longer than width of femur and some black gradually shortening pilosity on apical ⅕; tibiae brownish-yellow in basal half and at tip, hind tibia yellowish-brown in basal third and otherwise black; protarsus and hind tarsus dorsally black, mid tarsus with segments 1–4 brown and 5 th segment black.

WING. Slightly brownish, transverse veins brown infuscated, entirely microtrichose; Rs in basal ⅔ with a few black pile; inner angle of veins M 1 and R 4+5 obtuse. Haltere with stem yellow and knob yellow and dorsally brownish, calypter yellowish-brown, with yellow rim and pilosity.

ABDOMEN. Oval, width approximately equal to scutum width at level of wing base, black with bluish reflection, laterally shiny and broadly brownish pollinose medially, with long, dense, erect pilosity, yellow on tergites I–II and in medial parts of tergites III–IV, tergites III–IV laterally black pilose, tergite V laterally with black pilosity. Sternites grey pollinose, long yellow pilose, sternite IV also with semiappressed black pilosity postero-medially. Genitalia with the asymmetrical gonopods (superior lobes).

Female

LENGTH. Body 9 mm, wing 8.5 mm.

HEAD. Frons broad, with clear lateral furrows, on anterior ⅓ with a transverse, very broad band of grey pollinosity, with erect mixed black and yellow pilosity. Basoflagellomere orange-brown, very big, slightly darkened on anterior margin.

THORAX. Scutum with moderately long, erect, yellow pilosity, with some black pilosity intermixed anterolaterally and on posterior half, scutellum with yellow pilosity, and some black pilosity on disc, hind margin with yellow pilosity, some of which are longer than length of scutellum.

LEGS. Femora yellow pilose and apico-posteriorly and apico-ventrally with black pilosity; yellow pilosity on ventral part of hind femur somewhat shorter than in male but at most 2× width of femur; tibia completely bright yellow, only hind tibia with indistinct brownish ring, colour of tarsi as in male. Haltere stem yellow, knob brown.

ABDOMEN. Broadly oval, yellow pilose; tergite I and anterior part of tergite II grey pollinose, posterior half of tergite II and tergites II–IV shiny, slightly pollinose, yellow pilose, tergites II–IV yellow pilose anteriorly and black pilose posteriorly, tergite V shiny, black pilose. Sternites grey pollinose, sternites I–III yellow pilose, sternites IV–V laterally with yellow pilosity, medially broadly black pilose. In other characters as the male.

Distribution

Nepal.

Figures

Fig. 50. Cheilosia (Montanocheila) picta sp. nov., holotype, ♂ (CNC). 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–G. Superior lobe of hypandrium, lateral view. Scale bars indicated in drawings.

Fig. 51. Cheilosia (Montanocheila) picta sp. nov. A–B. Holotype, ♂ (CNC), dorsal and lateral views. C–D. Paratype, ♀ (CNC), dorsal and lateral views. Photo: Pekka Malinen, FMNH Luomus. Scale bars = 1 mm.