none Enter On the bases of field investigation and lab observation, the species and host selectivity of parasitic wasps in the egg sac of the wolf spiders Pardosa pseudoannulata and P. astrigera were studied for a year around Erhai Lake, Yunnan province. Idiolispa sp. and Idris sp. were both found in the egg sacs of P. pseudoannulata and P. astrigera. Idiolispa sp. preferred to parasitize in the egg sacs of P. pseudoannulata. However, Idris sp. showed no parasitical preference between two spiders, both of which were its suitable host. The reasons of host-preference of Idiolispa sp. were further discussed in this paper. November 28 2012 noneEmail20150319 failed