Abstract:Polyrhachis vicina Roger,a species of ant in the south of Chinese mainland,is used as Chinese medicine for rheumatoid arthritis.In mountain areas of Zhejiang Province,those mountain slopes nested by this ant were enclosed by local peasants for protection and collection of this ant.But how and when to collect this ant in the case of keeping the equilibrium of population and of reaching the highest harvest yield in a mountain slope need to be investigated.\;In this paper,effects of different nest collecting...