| Application and material foundation of signal transmission of kairomone of Telenomns theophilae Wu et Chen have been studied in the paper. The experimental materials were included of parasitoids of T. theophilae, host-recognition kairomones of T.theophilae, eggs of Bombyx mori and Dendrolimus punctatus, and parasitoids of T. dendrolimusi. The results are summarized as follows:1) Through use of the host recognition kairomone of T.theophila Wu et Chen, the parasitoid T. theophila was successfully induced to oviposit in a nonhost of Dendrolimus punctatus Walker, which had been a new host of T. theophila besides the original hosts of Theophila mandarina and Bombyx mori. The result showed the parasitism ratio of T.theophila in the nonhost being coated with kairomone was 92.1%, having no significant difference with that in the unnatural host of B. mori. The average duration of life cycle of T. theophila's filial generation in the nonhost was about 20 days, which was about 2 days longer than that in B. mori. Further studys showed three factors had influenced T. theophila's parasitism. They were the varied concentrations of the kairomone, the parasitoid's parasitism experiences, and the differences of the nonhost eggs. On analysing the effects of them, it was concluded that the best way of T. theophila's parasitism in the nonhost was to take use of inexperenienced T. theophila, and anatomized eggs from female D. punctatus adults' ovary, which should be coated with kairomones being diluted from 4 to 128 times.2) Studies on the parasitical behavior of T. theophila on its nonhost of D. punctatus which eggs had been coated with host-recognition kairomones being 4 times diluted indicated that it was similar to that on its unnatural host of Bombyx mori. Both of them were composed of five steps of examination, probing, drilling, oviposition and marking. The results of observations of the whole parasitical behavior which was needed for T. theophila to oviposit in nonhostsof D. punctatus indicated that the average time of each behavior according to the order ofexamination, probing, drilling, oviposition and marking were 32.0", 30.4", 323.8", 77.2" and30.1" separately, while those on eggs of B. mori were 23.7", 22.0" 318.7", 66.7" and 44.6" separately. Among them, each average time of examination, probing and oviposition of T. theophila on eggs of D. punctatus was significantly grater than that on eggs of B. mori, but the average time of marking was significantly lower than that on eggs of Bombyx mori, andthere was no significant differences of the average time of drilling or the whole time of the five steps between on eggs of D. punctatus and B.mori. Otherwise , the average time of parasitical behavior of T. theophila either on egge of D. punctatus or B.mori was related to the parasitical times of T. theophila.3) The ultrastructures of antennae sensillum of Telenomus dendrolimusi Chu were observed with scanning electron microscope. Nine kinds of sensillum were observed on the antennae of T.dendrolimusi, all of which had been also been observed on the antennae of T.theophilae. They were Basiconic sensillum (BS), Trichoid sensillum I (TSD), Trichoid sensillum II (TSD), Styloconic sensillum (SCS), Fluted bent-tipped sensillum (FBS), Lateral multiporous sensillum (LMPS), Papilla-tipped cylindric sensillum (PCS), and Pore-tipped ampullaceous sensillum (PAS) separately. But there were differences in amount and distribution of the antennae sensillum between T. dendrolimusi and T.theophilae except for pore-tipped ampullaceous sensillum (PAS) and apilla-tipped cylindric sensillum (PCS). At the same time, both female and male erternal genitilias of T.dendrolimusi and T.theophilae were observed. The appearance of female external genitalias between T.dendrolimusi and T.theophilae was similiar. The length of the two first valvulaes (VI) was not equal, and both of them were shorter than the second valvulae (V2). There were much stripes and a hole-like structure on the foreside of VI, 10 angle-like str...
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