Flavizona dolichostigma Huo

Huo, Ke-Ke & Shi, Fu-Min, 2010, Flavizona Huo, a new genus of Syrphini from China, with a key to genera of Syrphini in China, Zootaxa 2428, pp. 47-54 : 51-53

Flavizona dolichostigma Huo , sp. nov.

Figs. 1–5

Diagnosis: small sized, black flies with wing lacking dark brown macula and abdomen yellowish orange on terga 1, 2 and basal third of tergum 3.

Adult: Body length: 11 mm (3) or 10 mm (Ƥ); wing length: 9 mm (3) or 9 mm (Ƥ).

Head: Eye dark brown, holoptic, densely long dark brown pilose, but yellowish posteroventrally from some views. Eyes joined for a distance shorter than length of frons. Vertex narrow, shorter than eye contiguity. Frons black, lustrouse anteriorly, sparsely long black pilose, basally covered with gray pollen which obscured background. Lunule shining black. Face subcarinated, underneath frontal prominence shallowly concave, and then extended obliquely downwards and forward, facial tubercle indistinct, which is only a small prominence at ventral third of face from lateral view. Face dull brown, gray pollinose, obscured background, thinly black long hairs intermixed with some yellowishwhite ones, leaving facial medial vitta black, lustrous, about 1/3 face in width, laterally below eyes with black vittae. Gena blackish brown, gray pollinose, covered thinly with whitish long pile. Occiput narrower, black pilose with a row of black long hairs along posterior margin of eyes on dorsal portion, gradually broadened laterally downwards with whitish pollen and pile which is longer on lower parts. Antenna black, dorsal and ventral margins of two basal segments black pilose, basoflagellomere as long as two basal segments combined together, about twice as long as wide, apex bluntly rounded. Arista long, black with microscopic pubescence.

Thorax: Scutum longer than wide, black with bluish reflection, covered with gray pollen which obscured background and formed indefinitely lateral vittae before transverse suture and in the middle portion a pair of definite gray vittae extending beyond transverse suture. Pile long, yellowish, intermixed with some black pili anteromedially. Scutellum black, but slightly yellow brown apically, thinly gray pollinose, with yellowish long pile and dense ventral scutellar fringe. Pleura shining black, slightly with bluish tinge, gray pollinose, which obscures background of anepisternum, posterodorsal part of katepisternum, anepimeron and katepimeron. Pleural pile long, yellowish to yellowish white, but meron bare. Pile patches on katepisternum broadly separated posteriorly. Metasternum bare.

Legs: black, but yellowish brown on apices of femora, pro- and mesotibiae and basal 1/3 of metatibiae; pro- and mesotibiae with dark markings on apical part; pro- and mesotarsi dull brown. Pile of legs mainly black, except for yellow ones on pro- and mesotibiae. Pro- and mesofemora with black long pile on posteroventral portion throughout. Metacoxa black long pilose without a pile tuft posteromedially, femur anteroventrally with black long hairs, metatarsi nearly as long as metatibiae.

Wing: entirely microtrichose, hyaline, in middle portion without dark brown macula. Cell R1 open; Vein r4+5 straight, joined with m 1 in a right angle. Vein r-m located before middle of cell DM. Pterostigma brownish black, long, extending from apex of vein sc to apex of vein r1+2. Calypteres dull brown with fringes of same color. Halter brown with yellowish capitulum.

Abdomen: without premarginal sulcus, elongate oval, parallel-sided, tapered backward from tergum 4. Abdominal terga of 1, 2 and basal third of tergum 3 yellowish orange, the rest black with a little blue reflection, Pile of similar color to background, which is longer basally on lateral margins. Sterna have similar color and pile to that on terga, but pile nearly adpressed on posterior 2/3 of sternum 4 and other sterna behind.

Female: Dichoptic. Width of vertex between posterior margins of eyes slightly less than 1/4 head width. Ocellar triangle slightly convex. Ocelli equilateral triangle. Vertex and frons gradually broadened forward, shiny black, brown pollinose and long black pilose. Antenna shorter than in male. Thoracic pile whitish yellow. Scutum on anterior half gray pollinose, obscured background. Scutellum distinctly yellow brown on posterior half. The other characters are similar to in male.

Type material: Holotype: 3 (deposited in BKLSUT). CHINA: Henan Province, Baiyun Mountain, Song County, Aug. 17, 2008, collected by Huo Ke-Ke; paratype: Ƥ (deposited in BKLSUT). CHINA: Sichuan Province, Hongba, Jiulong County, Sep. 26, 2008, collected by Shi Fu-Min.

Etymology: The new name is derived from the Greek words dolich- (long) and stigma (pterostigma), referring to long pterostigma.

Distribution: China (Henan Province, Sichuan Province).

Figures

FIGURES 1 – 5. Flavizona dolichostigma: 1. Male habitus, left lateral view; 2. Male head, right lateral view; 3. Female head, left lateral view; 4. Antenna, median view; 5. Wing, dorsal