﻿Two new species of the genus Norellisoma Wahlgren, 1917 (Diptera, Scathophagidae) from Yintiaoling Nature Reserve, Chongqing, China

﻿Abstract The known species of the genus Norellisoma from China are reviewed and two new species from Yintiaoling Nature Reserve in Chongqing City, where no other Norellisoma species are recorded, are described: Norellisomawuxiensesp. nov., Norellisomayintiaoensesp. nov. A key to the species of Norellisoma from China is provided.


Introduction
The genus Norellisoma Wahlgren, 1917 is a moderately large genus of the Scathophagidae distributed in the northern hemisphere, reaching its highest diversity in the Palaearctic Region (Ozerov and Krivosheina 2020;Iwasa and Sasaki 2022). At the present time, the genus comprises 29 species, four of which have been recorded in China (Sun 1992;Ozerov 2009;Bernasconi and Šifner 2021;Iwasa and Sasaki 2022).
Yintiaoling Nature Reserve is located in northeast Chongqing City, whose average elevation is 1900 m asl. In Chongqing, Yintiaoling National Nature Reserve is the only primary forest with rich species diversity but the fauna of Norellisoma is poorly known. In our paper, we describe and illustrate two new species from Yintiaoling National Nature Reserve. A key to the six known species from China is presented (Xue and Zhao 1996).

Taxonomy
Head yellow. Eyes reddish brown, occiput yellow to black. Setulae on head yellow, setae brown to black; 3-4 fr s, 2 orb s, 1 oc s, 1 i vt s, 1 o vt s, 1 poc s. 1 pair of strong vibrissae. Antenna yellow except arista yellow to blackish brown, first flagellomere 2 times as long as wide; arista with short blackish brown pubescence. Proboscis yellow; palpus yellow with yellow setulae and setae.
Legs mostly yellow, but mid and hind femora usually blackish dorso-distally. Setulae on legs yellow, setae black or yellowish brown. Fore femur with row of 8 short av and 10 long pv. Fore tibia with row of 7 av and 4 pv, also with 1 ad, 1 d, 1 pd at apex. Mid femur with 1 pd and row of 5 short a. Mid tibia with 1 ad, 1 pd and 1 av, also with 1 ad, 1 d, 1 pd, 1 v, 1 pv at apex. Hind femur with 1 v and row of 5 short a. Hind tibia with 3 ad, 1 d, 2 pd and 1 av at apex. Wings hyaline; veins brown. R 1 bare; CuA 2 + A 1 not extending to wing margin. Calypter yellow. Halteres yellowish white.
Abdomen blackish brown. Setulae and setae yellow. Male sternite 4 rectangular, wider than long. Male sternite 5 with diverging lateral lobes and two short median projections.

Distribution. China (Chongqing).
Etymology. The specific epithet refers to the type locality Wuxi.   Remarks. This new species is similar to Norellisoma wuxiense sp. nov., but may be separated from the latter by the following features: pregonite not curved with 3 yellow apical setae and postgonite apically curved.