New species and records of the genus Antocha Osten Sacken (Diptera, Limoniidae) from Tibet, China with a key to species in Qinghai-Tibet region

Thirty-four known species and subspecies of the genus Osten Sacken, 1860 have been recorded from China, of which four occur in Tibet. Herein, two new species, A. (Antocha) curvativa and A. (A.) tibetana , are described and illustrated from Tibet. The new species are distinguished from congeners mainly by their male genitalia. Antocha (A.) spiralis Alexander, 1932 and A. (A.) setigera Alexander, 1933, which are newly recorded in Tibet, are redescribed and illustrated. A key to species in the Qinghai-Tibet region of China is also presented.