Phyllomyza guangxiensis, 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 guangxiensis sp. n. Figs 1-4

Diagnosis.

Gena approximately one-fourteenth of eye height. Upper blade of bifurcated tip of surstylus swollen and apical margin rounded, lower blade thin and longer than upper one; cercus arched with short sparse setae.

Description.

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

Head (Fig. 1) black with greyish microtomentum; orbital plate satiny blackish brown, with microtomentum, ocellar triangle blackish brown without microtomentum; lunule very depressed falciform, darkish brown with black margin. Posterior eye margin ventrally diverging from head margin; eye 1.4 times as high as long, gena approximately one-fourteenth 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 on blackish brown orbital stripe, orbital setae lateroclinate and frontal setae medioclinate, four interfrontal setae; postocellar setae cruciate. Lunule with two setae. Vibrissal angle flat, the tip a little more than a 90°angle; vibrissa strong, located below level of lower margin of eye. Antenna darkish brown pedicel with short black setulae at middle and margin, setulae at margin longer than others, longest one approximately five times longer than others; first flagellomere with pubescence, irregularly oblong; arista three times as long as first flagellomere, black, distinctly pubescent. Proboscis short and folded, darkish brown, with sparse black setulae. Palpus wide, 0.5 mm, with blunt apex in lateral view; darkish brown with short dense black pubescence, margin without sparse setulae.

Thorax brown with grey microtomentum, except scutum shiny brownish with sparse black microtomentum; scutellum brownish with gray microtomentum. Setae and setulae on thorax black; one h, two dc, one prsc, two npl, one prs, one pos, one sa, one pa, one kepsts (setulae at forward position); scutellum 1.5 times wider than long, with pair of asc and bsc, asc three times longer than bsc. Legs slender, coxae and femora darkish brown, tibiae yellow except hind tibia brown with yellow apex, tarsi yellowish. Setae and setulae on legs black, mid tibia with single black preapical dorsal seta. Wing (Fig. 2) hyaline, unspotted; veins brown; Sc strong; M1 between r-m and dm-cu longer than dm-cu. Calypter yellowish, with dense brownish microtrichae, margin with thin and long setulae. Knob of halter brownish, stalk yellow.

Abdomen blackish brown with grey microtomentum. Setae and setulae on abdomen black; TII-TV with setae, marginal setae longer than others; sternites with sparse black setulae at posterior 3/4. Posteromedial triangular projection of TI into TII present; SII generally luniform, the apex blunt and round, SIII irregularly oblong, SIV generally quadrate, SV depressed panduriform, apical margin arched. Male genitalia (Figs 3-4): epandrium with eight strong black setae; upper blade of bifurcated tip of surstylus swollen and apical margin rounded, lower blade thin and longer than upper one; cercus arched with short sparse setae.

Female. Unknown.

Material examined.

Holotype, ♂, China, Guangxi, Fangchenggang, Shangsi County (21°53'47.61"N, 107°49'20.32"E; 450 m), 18. V. 2012, Guo-Quan Wang (CAU). Paratypes, 2 ♂♂, same data as holotype.

Distribution.

China (Guangxi).

Etymology.

The specific name guangxiensis is derived from the type locality.

Remarks.

This species is similar to P. nudipalpis Malloch, but can be separated by the gena being approximately one-fourteenth of the eye height and the knob of the halter brownish; in P. nudipalpis , the gena is approximately one-eighth of the eye height and the knob of the halter is yellowish white ( Malloch 1914b).