Four new species of Helina Robineau-Desvoidy from far northwestern China (Diptera: Muscidae)

In this paper, four new species of Helina Robineau-Desvoidy are described and illustrated from Xinjiang Uygur Autonomous Region, China, namely, Helina ctenophora Xue sp. nov. in the H. annosa-group, H. franzosternita Xue sp. nov. in the H. calathocerca-group, H. xinyiliia Xue sp. nov., and H. umbratiseta Xue sp. nov. in the H. subpubiseta-group. Identification keys to species of those three species-groups are provided. The examined specimens are deposited at the Insect Collection of Shenyang Normal University.