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As a by-product of the authors' work (MOCHIDA & YOSHIMEKI, 1962) under this heading, a brief information is given along the following lines. 1. Hibernation of Apanteles : Apanteles chilonis (MUNAKATA) (Hym., Braconidae) is a gregarious endoparasite of larvae of the rice stem borer, Chilo suppressalis WALKER (Lep., Pyralidae), occurring in Japan. The parasite hibernates in the state of larva within full-grown larvae of the borer in diapause (TATEISHI, 1962). Among the larvae of the borer dissected both in December of 1960 and in March-April of the following year, there were found some larvae within which the larvae of A. chilonis lived. Examining the parasite larvae, the authors could not find any special difference between those of different seasons. In spring, the parasite larvae remove from the host body to pupate, breaking through its skin, and then spin their small white cocoons clustered together in the tunnel of the borer. Examining 10 victims of the borer, it was found that the number of parasites issuing from each victim varied from 15 to 51, being 22.0 on the average. After the issuing of the parasites the victim does not lose its life immediately, but keeps itself alive for several days, as well as in the cases of majority of Apanteles spp. pointed out by MUESEBECK (1918). 2. Size of corpus cardiacum and corpus allatum complexes of the normal and parasitized larvae of the borer: Measuring the size of the unilateral corpus cardiacum and corpus allatum complex of the borer in different cases (see; A-D in Table 1), the authors obtained the following results as summarized in Table 1. As shown in the table, there is no significant difference in the size of the complexes between the normal larvae in diapause (A) and the parasitized larvae in which parasites still remain (B & C). On the other hand, the size of the complexes of the parasitized larvae from which all parasites already issued (D) is significantly smaller than that of the normal ones in diapause (A). Likewise, relationship between change of the size of the complexes of these normal larvae and that of these parasitized larvae is given in Fig. 1. Judging from these facts only, however, it is

On Issuing of the Braconid Parasite, Apanteles chilonis, from its Host Body and the Breaking of Diapause in the Host, Chilo suppressalis