Cheilosia (Eucartosyrphus) bullabucca Barkalov & Ståhls, 2015

Barkalov, Anatolij V. & Ståhls, Gunilla, 2015, Descriptions of three new species of the genus Cheilosia Meigen from China (Diptera, Syrphidae), Zootaxa 3972 (2), pp. 280-290 : 283-284

Cheilosia (Eucartosyrphus) bullabucca Barkalov & Ståhls sp. n.

( Figs 1A–D )

Type material. HOLOTYPE. ♂, China, Sichuan Province, Gongga Shan, 29.579°N 102.01°E, 2800–3000 m above sea level, 30.06.2009, leg. Blank, Liston & Taeger. 0 71 China, DNA voucher specimen MZH _ Y 1540, in MZH.

Diagnosis. The new species can be separated from all known Cheilosia species by following combination of characters: eyes bare, pedicel light brown, facial knob broad and shiny, frons shiny, scutum with stripes of brown dusting anteriorly, and fore tarsi dorsally yellowish-brown.

Description. MALE. Body length 6.3 mm, wing length 7.0 mm. Head. Face shiny black, with broad but somewhat pointed facial knob ( Fig. 1A ), bare, eye margins narrow brownish with greyish dusting and short yellow hairs; cheeks low, brownish, covered with white hairs and slight grey dusting. Frons shiny, with black hairs; angle of approximation of eyes>90° ( Fig. 1B ); lunula brownish; antennal pits confluent as anterior process of lunula is not connected with upper part of face. Antenna mostly black, pedicel brown, basoflagellomere rounded, covered with silvery dusting; arista black, shiny, covered with not very long but distinct hairs ( Fig. 1D ). Eyes bare, length of eye contiguity more than 2 times longer than length of frons without lunula. Vertex narrow, slightly convex, covered with black hairs; ocellar triangle isosceles. Thorax. Scutum black, shiny with stripes of brown dusting in anterior part, laterally and transversely at scutellum; covered with long erect black hairs and with three longer bristles laterally posterior of transverse suture, and with two very long erect black bristles on postalar callus. Postpronotum with grey dusting and black hairs. Scutellum with black hairs and with many long strong black bristles longer than scutellum length on side margin. Subscutellar fringe of long yellow hairs mixed with black long hairs, laterally only black hairs. Pleura finely grey dusted, posterior part of anepisternum with mixed black and yellow hairs, anepimeron with black hairs, katepisternum covered with yellow hairs and dorsally also mixed with some black hairs, hair patches narrowly separated. Legs: femora black, fore femur with mixed black and yellow hairs postero-dorsally, mid and hind femora with white hairs on basal half and with black hairs on apical half; hairs postero-ventrally on mid femur longer than width of femur; fore and mid tibiae yellow with more or less developed broad black ring on apical part, hind tibia yellow in basal 1/3 and on tip and black on other part; fore and mid tarsi yellowish-brown except dark apical segment. Wings hyaline, inner angle between veins M1 and R4+5 acute ( Fig. 1C ). Squama white, with yellow fringe of hairs; haltere yellow with whitish knob. Abdomen. Slightly narrower than mesonotum at wing base level, black, covered with yellow hairs, some black hairs on anterior corner of tergum II and on posterior corners of terga III–IV. Terga III–IV medially with short appressed black hairs. Tip of abdomen with black hairs. Genitalia lacking. FEMALE. Unknown.

Etymology. The specific epithet (noun in apposition) contains the Latin words bulla (bubble, knob) and bucca (cheek) and refers to the swollen face.

Distribution. China: Sichuan Province.

Taxonomy. The taxon shares the following characters with taxa of subgenus Eucartosyrphus: bare eyes, confluent antennal pits, fore and mid tibiae at least partly yellow.

In the key to Chinese Cheilosia ( Barkalov & Cheng 2004) the new species keys out as follows:

14. Femora yellow or yellow with indistinct dark ring...................................... C. quarta Barkalov & Cheng - Femora black or dark-brown............................................................................ 15 15. Pedicel light brown, 1–4 segments of fore tarsi yellowish brown, mesonotum with stripes of brown dusting in anterior half. C.

bullabucca sp. n.

- Not this combination of characters...................................................................... 16

Figures

FIGURE 1. A – D: Cheilosia (Eucartosyrphus) bullabucca sp. n. E – G: Cheilosia (s. str.) lamproptera sp. n. A & F: head laterally, B & E: head dorsally, C: tip of wing, D & G: 2 – 3 antennal segments laterally.