Mydaea quinquiseta Xue

Du, Jing, Hao, Bo, Xue, Wanqi & Zhang, Chuntian, 2019, Five new species of Mydaea from China (Diptera, Muscidae), ZooKeys 897, pp. 101-114 : 101

Mydaea quinquiseta Xue sp. nov.

Type material.

Holotype. China, 1 ♂, Sichuan Province, Luding, Yanzigou, 29°38'N, 102°07'E, alt. 2600 m, 17 June 2006, Jiayu Liu, (SYNU). Paratypes. 2♂♂, same data as holotype.

Diagnosis.

Eyes bare; post-dc 4; distal and lateral part of scutellum yellow; anterior and posterior spiracle brown; legs brown-yellow; both sides of abdomen without color shifting patch; cerci circular apically in posterior view.

Description.

Male. Body length 7.4-7.6 mm. Head: eyes bare, facets on upper half not enlarged; frontal vitta black; antennae black, arista brown; lunule brown; genae black, genal and postgenal hairs entirely black; palpi black. Frons approximately 1.5 times as wide as anterior ocellus; fronto-orbital plates contiguous in the middle; frontal vitta triangle on upper 1/4 of frons; fronto-orbital plates and parafacial covered with distinct gray pruinosity, parafacial approximately 3/5 as wide as postpedicel; postpedicel approximately 3.5 times as long as wide; lower face not projecting, vibrissal angle situated behind frontal angle in lateral view; genae covered with gray pruinosity, genal height approximately 1/9 of eye height. Frontal setae in 13 or 14 pairs and these situated on lower half of frons; proclinate orbital setae absent; ocellar setae long and strong, slightly longer than the lower frontal setae; arista short plumose, maximum length of hairs approximately 2/3 of the width of postpedicel; palpus approximately 1.5 times as long as prementum, prementum approximately 2.2 times as long as high, and covered with gray pruinosity; labellum strong, extending to posterior part, and slightly longer than palpi. Thorax: black, but distal and lateral parts of scutellum yellow, covered with sparse gray pruinosity; scutum with 4 indistinct vittae and the inner vittae not extending to scutoscutellar suture; acr 0+1; dc 2+4; ial 0+2; pra long and strong, slightly longer than posterior notopleural seta; notopleuron with small hairs; lateral and ventral surfaces of scutellum without hairs; basisternum of prosternum, anepimeron, meron and katepimeron bare; katepisternal setae 1+2; anterior and posterior spiracles brown. Wings: semi-hyaline and basal part brown; tegula and basicosta yellow; costal spine small; ventral surface of vein C with hairs; Sc bow-shaped; middle part of crossvein dm-m bent towards base of wing, area around crossveins r-m and dm-m not clouded; dorsal and ventral surfaces of radial node with hairs; R4+5 and M1 straight, apical part of M1 bent forward slightly; calypter slightly brown; lower calypter tongue-shaped; halter knob yellow. Legs: entirely black; fore tibia without median p; mid femur with a row of pv on basal 3/5, and a row of a setae on basal half, 1 apical ad, 3 apical pd, mid tibia with 3 p; hind femur with a distinct row of av on distal half, and pv on basal half shorter than transverse diameter of hind femur, hind tibia with 4 or 5 av, 2 ad, without pv; claws as long as pulvilli, and short than tarsomere 5. Abdomen: ground color black; ovate in dorsal view, covered with gray pruinosity, both sides without color shifting patch, tergites 3 and 4 with median black vittae, tergites 4 and 5 each with a complete row of posterior marginal setae, tergite 5 with lateral discal setae on anterior half and otherwise devoid of hairs, sternite 1 bare, sternite 5 with 5 strong, median setae; cerci circular apically in posterior view.

Female. Unknown.

Remarks.

This species is similar to Mydaea gracilior Xue, 1992, but differs from the latter in the following features: facets on upper half of eyes not enlarged; acr 0+1; pv on basal half of hind femur shorter than transverse diameter of hind femur; cersci circular apically in posterior view; distal parts of cerci and surstyli not bent in opposite directions.

Etymology.

The species name refers to the lobe of sternite 5 which in males has 5 strong setae. It is derived from the Latin words quinqu meaning five and seta meaning setae.

Distribution.

China, Sichuan Province (Yanzigou).