Phyllomyza luteigenis, Xi, Yu-Qiang, Yang, Ding & Yin, Xin-Ming, 2018

Xi, Yu-Qiang, Yang, Ding & Yin, Xin-Ming, 2018, The genus Phyllomyza Fallen from China, with descriptions of three new species (Diptera, Milichiidae), ZooKeys 760, pp. 143-157 : 143

Phyllomyza luteigenis sp. n. Figs 5-8

Diagnosis.

Gena approximately one-quarter of eye height. Surstylus with upper blade of bifurcated tip extremely swollen, lower blade short and thinner than upper blade.

Description.

Male. Body length 1.7-1.9 mm; wing length 1.6-1.8 mm.

Head (Fig. 5) darkish yellow with greyish microtomentum; orbital plate satiny yellow, with microtomentum; ocellar triangle brownish without microtomentum; lunule very depressed luniform, brownish with black margin. Posterior eye margin ventrally diverging from head margin; eye 1.1 times as high as long, gena approximately one-fourth of eye height. Setae and setulae on head black; ocellar triangle with two ocellar setae and three short setae; frons with three orbital and two frontal setae, orbital setae lateroclinate and frontal setae medioclinate; four interfrontal setae; postocellar setae cruciate. Lunule with two short setae. Vibrissal angle blunt, the tip almost a 90°angle; vibrissa strong, located at the level of lower margin of eye. Antenna blackish yellow; pedicel with black setulae at middle and margin, setulae at margin longer than others, longest one approximately 3 times longer than others; first flagellomere with pubescence, irregularly quadrate and margin blunt; arista 2.5 times as long as first flagellomere. Proboscis short and folded, brownish, with short sparse black setulae. Palpus slightly flat, 0.4 mm, apex blunt in lateral view, 3 times longer than wide; darkish yellow with short dense brownish pubescence, margin without short sparse setulae.

Thorax yellow with grey microtomentum, except scutum shiny darkish yellow with sparse brownish microtomentum; scutellum brownish yellow with gray microtomentum. Setae and setulae on thorax black; one h, two dc, one prsc, two npl, one prs, one pos, one sa, one ia, two pa, one kepsts (a row of setulae at forward position); scutellum 1.3 times wider than long, with pair of asc and bsc, asc two times longer than bsc. Legs slender, coxae and femora brownish, tibiae brownish except fore tibia darkish yellow, tarsi yellowish. Setae and setulae on legs black. Mid tibia with a single black preapical dorsal seta. Wing (Fig. 6) hyaline, unspotted; veins brown; Sc strong; M1 between r-m and dm-cu a little longer than dm-cu. Calypter yellowish, with yellowish microtrichae, margin with brownish setulae. Knob of halter white, stalk yellowish.

Abdomen brownish with gray microtomentum. Setae and setulae on abdomen black; TII-TV with setae at posterior 3/4, marginal setae longer than others; sternites with sparse setulae. Posteromedial triangular projection of TI into TII present; SII irregularly luniform, apical margin blunt, SIII irregularly oblong, SIV very broadly panduriform, basal margin a little wider than apical margin, SV very shallowly falciform. Male genitalia (Figs 7-8): epandrium with nine strong black setae; surstylus with upper blade of bifurcated tip extremely swollen, lower one short and slightly thin; cercus arched with short sparse setae.

Female. Unknown.

Material examined.

Holotype, ♂, China, Gansu, Tianshui City, Maiji Mountain (34°23'30.31"N, 106°06'35.61"E; 150 m), 15. VII. 2012, Li-Hua Wang (CAU). Paratypes, 3 ♂♂, China, Gansu, Tianshui City, Maiji Mountain (34°23'30.31"N, 106°06'35.61"E; 150 m), 15. VII. 2012, Ze-Hui Kang (CAU).

Distribution.

China (Gansu).

Etymology.

The specific name refers to the yellow gena.

Remarks.

This new species is distinctly different from other species of the genus: the gena is approximately one-fourth of the eye height, eye 1.1 times as high as long, and SV is generally very shallowly falciform.