Matsumyia zibaiensis, Huo, Keke & Ren, Guodong, 2006

Huo, Keke & Ren, Guodong, 2006, A key to known species of Mastumyia Shiraki (Diptera, Syrphidae) from China, with descriptions of two new species, Zootaxa 1374, pp. 61-68 : 65-67

Matsumyia zibaiensis sp. nov.

( Figs. 4–10 )

Diagnosis. Male with vertex black pilose; female face dark reddish brown, legs reddish brown at most part.

Adult. Body length 15 mm (ɗ) or 13 mm (Ψ), wing length 11 mm (ɗ) or 12 mm (Ψ).

Head. Black in ground color, slightly broader than thorax. Eyes bared, shortly confluent on frons. Vertex narrowly elongate with black hairs. Ocellar triangle located at the middle of vertex. Occiput covered with whitish yellow hairs and tomentum. Frons small with longitudinal furrow medially, protruded conspicuously, covered with sparse yellow hairs and whitish yellow tomentum laterally but bared anteriorly. Lunule reddish yellow. Face deeply concave below frontal prominence in profile, almost straight below facial tubercle, with facial tubercle rounded, decorated with sparse yellow hairs along eye margins and whitish yellow tomentum most part but shiny black below eyes, thinly yellow pilosed laterally. Eye orbits extended from below eyes up to the level of upper margin of facial tubercle, with a small spot of whitish yellow tomentum just below eyes. Antennae tawny, with basal 2 segments pilosed dorsally and ventrally, first flagellomere shorter than basal 2 segments together, broader than long. Arista bare, long, dull brown but yellowish brown at basal 1/3.

Thorax. Scutum densely covered with greyish yellow pruinosity concealing the ground color, with a pair of longitudinal greyish yellow pollen stripes in the middle anteriorly, extending over transverse suture. Dorsum of mesothorax clothed with long whitish yellow hairs, which longer on postalar callus. Scutellum decorated with whitish yellow pruinosity and dense long hairs. Mesopleuron black, with proepisternum, anepisternum posteriorily, katepisternum anteriorly and posteriorly, anepimeron densely white pollinose and long yellowish pilose. Metasternum covered with long white hairs and pruinosity. Fore legs with coxae and trochanters black, femora conspicuously thickened, black except yellow brown apically, with whitish yellow hairs which longer at base posteriorly, tibiae and tarsi dull brown with yellow brown hairs, tibiae darker at apical half, tarsi with segments 3–5 black brown dorsally. Middle legs similar to fore legs, but femora with longer hairs posteriorly, tarsi with segment 5 black brown. Hind legs with coxae and trochanters black, coxae with white pruinosity and hairs, trochanters bare, femora distinctly thickened at the middle, black but yellow brown on apex, with brownish yellow hairs and longer whitish yellow hairs anterodorsally, black spines ventrally, and more denser near apex, a row of long yellow hairs separating broadly and evenly on the ventral bilaterally, tibiae reddish brown to dull brown, compressed laterally, bent slightly, with a obtuse tooth at apical margin inside, tarsi reddish brown with segment 5 black dorsally. Wing hyaline, with indistinct stripe-shaped yellow brown marks, cell R1 open, vein r4+5 straight, cell R5 distinctly petiolar, upper and lower cross-vein parallel with margin of wing, vein r-m oblique, located behind the middle of cell M2, stigma vein present.

Abdomen. Black, broadly oval, flattened. The 1st tergite densely clothed with whitish yellow pruinosity and hairs. The 2nd tinged with reddish brown, covered with whitish yellow pruinosity at anterior corner extending to posterior 1/3 along lateral margins, with short, adpressed black hairs except long hairs at base laterally. The 3rd tergite with reddish brown reflection, covered with yellow, adpressed short hairs, and greyish yellow pruinosity forming a pair of quadrate spots in the middle. The 4th tergite with adpressed, short yellow hairs, densely covered with greyish yellow pollen but thinner anteriorly, and a pair of triangular black spots in the middle laterally. Apical part of abdomen black with yellow hairs. Venter black, covered with greyish yellow pruinosity and sparse long yellow hairs on basal 2 sternites.

Male genitalia. Brownish black, asymmetry. Epandrium black, rounded, inflated dorsally. Cerci yellowish brown, broader at apex, covered with long yellow hairs. Surstyli brown, broadened basally and tapered apically, with ventral margin concave, undulated, decorated with short, black spines apically, and long, dull yellow hairs on outside surface at base and short, black bristly hairs on inside surface. Hypandrium cylindrical. Superior lobe quadrate apically, with ventral margin triangularly concave at the middle. Aedeagus showed as Figs. 9 and 10 .

Female. Vertex narrow, space between eyes at posterior margins about 1/10 of head in width, ocellar triangle convex. Frons black pilosed, covered with white tomentum along eye margins. Face dark reddish brown, lustrous, pruinosity and tometum absent, protruded forwardly and downwardly at lower half, eye orbit narrow, reddish brown pilosed. Legs reddish brown, with hind femora dull in color, covered with brown hairs. Abdomen black, thinly pollinose, the 1st tergite reddish brown at anterior corner laterally, the 4th tergite with reddish brown pruinosity and hairs. Other characters same as in male.

Type material. Holotype ɗ, deposited in BKLSUT. China, Shaanxi Province, Mt. Zibai, Liuba County, 2100m, 2003. vii. 4, Keke Huo. Paratypes: 1Ψ, deposited in BKLSUT. China, Shaanxi Province, Mt. Zibai, Liuba County, 2100m, 1988. vi. 18, Keke Huo.

Etymology. The specific epithet refers to the type location, Mt. Zibai.

Distribution. China (Shaanxi Province).

Remarks. The new species resembles to Matsumyia nigriofacies Shiraki, 1949 , but can be separated from the latter by male vertex with black pilose, female face dark reddish brown; legs most part reddish brown. In Matsumyia nigriofacies , male vertex with yellow pilose, female face and legs black.

Figures

FIGURES 4 – 10. Matsumyia zibaienisis sp. nov. 4, lateral view of head, ♂; 5, lateral view of head, Ψ; 6, frontal view of head, ♂; 7, left lateral view of male genitalia; 8, ventral view of male genitalia; 9, lateral view of aedeagus; 10, ventral view of aedeagus.