After forty-eight years: An enigmatic new wormlion fly from Xizang, China (Diptera, Vermileonidae)

The brachyceran family Vermileonidae (wormlion flies) is characterised by larvae that construct pitfall traps for predation. The Oriental genus Vermitigris Wheeler, 1930 previously included four described species distributed in China, India, Indonesia, and Malaysia. In 1978, unidentified larvae of Vermitigris were collected by Fa-Sheng Li from Yadong, Xizang, China, but the adult stage remained unknown.

During a 2025 expedition, adult specimens were obtained, enabling their association with the larvae and recognition as a new species. Herein, Vermitigris tsangyanggyatso sp. nov. is described, with accounts of its immature stages and notes on its biology. This discovery increases the number of Vermitigris species recorded from China from one to two, the total number of species in the genus from four to five, and all the extant species in the family from 66 to 67.

The biogeographical implications for Vermitigris are also discussed.