抄録
This investigation was carried out in order to examine the relation of fly and its parasitic Hymenoptera for the purpose of practising fly contol operation at the rural districts of Tokyo. 1. Overwintering pupae of 18, 555 in number were collected in Ohme city and Chofu city, of which 9, 464 (51%) seemed to be replete by outside inspection. (Table 1) 2. These replete pupae were applied to observe the emergence of any insects from them. Flies of 3, 280 (33% to 9, 464) and 1, 998 (21%) parasitic Hymenoptera appeared. Ratio of fly to Hymenoptera was quite diverse by districts. (Table 2) 4. Of Sarcophagid flies occupied 82.7% and Calliphorid 8.6%. Of hymenopterous parasites Aphaereta sp. (2) occupied 33.7%, Brachymeria fonscolombei 30.7%, Exolytus laevigatus G. 19.7% and other species under 10%. (Table 3) 5. It is interesting that Aphaereta sp. (2) coincided with Sarcophagid in period of emergence and this parasite seems to be effective on fly control in Sawai and Minami-kosogi. (Table 2, 3) There found two types of Aphaereta (2) and of Trichopria commoda in the period of emergence. (Table 3) 6. Nakata's idea to cover the vessel containing fly pupae with a net of such mesh as Hymenoptera passable and not of flies is recommended instead of burning up the digged pupae usually practised in Japan as one of fly control measures.
