Tenodera angustipennis Saussure (Mantodea : Mantidae) has been suggested as a host of Podagrion philippinense cyanonigrum Habu, but the reported parasitism rate was quite low. No other mantis species has been reported as a host of this torymid wasp. We confirmed that P. philippinense cyanonigrum parasitized on the eggs of T. angustipennis at Sakai City, Osaka Prefecture, Japan. Additionally, P. philippinense cyanonigrum adults were emerged from an egg case of Acromantis australis Saussure (Mantodea : Acromantidae) collected at Minoo Park, Osaka Prefecture, Japan in early July. A. australis was suggested as a main host of P. philippinense cyanonigrum because of a relatively high parasitism rate.

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Larval host fungi for five fungus gnats of the genus Mycetophila : idonea Lastovka, matsumurai Last., perpauca Last., ruficollis Meigen and uninotata Zetterstedt (Mycetophilidae), of which M. uninotata was recorded from Japan for the first time, were recorded. Taxonomic characters of two crane flies, Metalimnobia bifasciata (Schrank) and Empeda nigroapicalis (Alexander)(Limoniidae) were given, the former occurred at the cultivated shiitake mushroom field and the latter was newly recorded from Honshu Is. Limonia avis Alexander and L. avis flavoabdominalis Alexander were synonymized with Metalimnobia bifasciata (Schrank). Japanese species of the Phoridae and Ephydridae were reviewed. Three host birds of Ornithomya avicularia aobatonis (Matsumura)(Hippoboscidae) were newly recorded.

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We analized the mortality factor of eggs and immature larvae of Sasakia charonda released on the host plants (Celtis sinensis) planted at the center of a grassland (Plot A), the edge of a small broadleaf forest (B), a large broadleaf forest (C) or a Japanese cedar forest adjacent to the large broadleaf forest (D). Mortality rates of the first, second and third instar larvae in each plot were higher than those of eggs and the fourth instar larvae. The major mortality factors at those stages were predation by ants, spiders and wasps. The major mortality factors in plots A and B were predation by ants, and at plots C and D predation by wasps as well as ants and spiders. The mortality rate in plot A was higher than that in the others. The predation pressure by natural enemies on the immature larvae of S. charonda was supposed to vary according to the change of vegetation surrounding the host plants, and important information was obtained that could lead to more effective conservation of S. charonda in the future.

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