A new species of Homoneura (Euhomoneura) from northern China (Diptera, Lauxaniidae)

Abstract Homoneura (Euhomoneura) yanqingensis sp. n. is described as new to science and Homoneura (E.) shatalkini Papp, 1984 is recorded from China for the first time. Photographs and illustrations are provided for both of these species, including genitalia. A key is provided to separate the Chinese species of the subgenus Euhomoneura.


Introduction
The subgenus Euhomoneura Malloch, 1927 is a small subgenus of the genus Homoneura (Wulp, 1891), which can be separated from other subgenera by the following key features: the lower margin of the face being about three times as wide as height of the gena and the anteriormost dorsocentral seta being at or before the transverse suture of the mesonotum. It includes 12 described species with three in China (Shiet al. 2012).
One species Homoneura (Euhomoneura) yanqingensis sp. n. is described as new to science and one species Homoneura (E.) shatalkini Papp, 1984 is newly recorded in China. A key is provided to separate the Chi nese species of the subgenera Euhomoneura.

Materials and methods
General terminology follows Gaimari and Silva (2010) and Shi and Yang (2014). Genitalia preparations were made by removing and macerating the apical portion of the abdomen in cold saturated NaOH for one hour, then rins ing and neutralizing them for dissection and study. After examination in glycerin, genitalia were transferred to fresh glycerine and stored in a microvial pinned below each specimen. Specimens examined were deposited in two collections: entomological collections of China Agricultural University, Beijing (CAUC) and Inner Mongolia Agricultural University, Hohhot (IMAU).

Taxonomy
Homoneura ( Diagnosis. Body yellow. Arista pubescent. Palpus with brown apex. Mesonotum with four strong and long acrostichal setae (two before suture, two after suture). All femora each with a brown irregular apicoventral spot and all tasomeres 3-5 brown. Wing hyaline, with five brown isolated spots. Head pale yellow. Frons with sparse grayish white pruinosity, longer than wide and parallel-sided; ocellar triangle brown, ocellar setae well developed, longer than anterior frontoorbital setae, anterior fronto-orbital setae shorter than length of posterior one; gena about 1/6 height of eye; antenna yellow; 1 st flagellomere yellowish brown, 1.5 times longer than high; arista dark brown except for pale brownish base, ray pubescent, with longest ray as long as 1/3 height of 1 st flagellomere. Proboscis yellow, palpus yellow except for brown apex.
Thorax yellow. Mesonotum with 1+2 dorsocentral setae; acrostichal setae in irregular six rows, with four strong and long acrostichal setae (two before suture, two after suture); a pair of prescutellar setae shorter than 1 st post-sutural dorsocentral setae. Leg mostly  yellow, all femora each with a brown irregular apicoventral spot and all tasomeres 3-5 brown. Fore femur with 6-7 posterodorsal setae, 4-5 posterovental seate, and ctenidium with 11-12 short setae; fore tibia with one strong preapical anterodorsal seta and one short apicoventral seta. Mid femur with five anterior setae and one short apical posterior seta; mid tibia with one strong preapical anterodorsal seta and one short apicoventral seta. Hind femur with one preapical anterodorsal seta and three anteroventral setae; hind tibia with one preapical anterodorsal seta and one short apicoventral seta. Wing hyaline, with five brown isolated spots: preapical spot on R 2+3 , apical spot on R 4+5 , subapical spot on M 1 , a cloud on crossvein r-m, and a narrow stripe-like spot on crossvein dm-cu (anterior margin and posterior margin darker than central area); pale brown along the radial sector; subcostal cell pale brown; costa with 2 nd , 3 rd and 4 th sections in proportion of 4.5:1.8:1; r-m beyond middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 1:1.6; ultimate section of CuA 1 about 1/6 of penultimate. Halter yellow.
Etymology. The new species is named after collection locality. Distribution. China (Beijing, Shaanxi).

Comments.
The new species is similar to Homoneura (Euhomoneura) balluca Sasakawa, 1992 from Malaysia. It can be separated from the latter by the mesonotum having brown stripes, the coxa and femora of legs being brown and the tibiae each having brown rings on both apex, and the abdominal tergite 6 having a pair of brown lateral spots.
A key to the five known species of the subgenus Euhomoneura in China Arista short plumose; male genitalia: surstylus with a sharp and a blunt apical protuberance in lateral view, aedeagus without rectangular dorsal sclerites (see Gao et al. 2003: 194 Mesonotum without strong central acrostichal setae; male genitalia: surstylus with tip projecting and upturned and aedeagus crossed at apex in posterior view (see Gao et al. 2003: 195