Abstract
A new species of the subgenus Larroussius Nitzulescu 1931, named Phlebotomus lengi in honour of the Chinese sandfly taxonomist Professor Yan Jia Leng, was found amongst the phlebotomine sandflies collected in Yunnan Province, China, in 1989. A full description of the male and female of this species is provided. The ascoid formula of P. lengi distinguishes it from all previously described members of the subgenus Larroussius.