抄録
For collection of flies which are insensitive to baits, a considerable amount of net sweeping was carried out on many kinds of fungi and grasses in the University Botanical Gardens at Sapporo, 1953. Twenty-two and eleven drosophilid species were obtained on six kinds of fungi and five kinds of grasses respectively. Most specimens observed in the samples belonged to D. trivittata, D. sexvittata and D. brachynephros for fungi, and D. nipponia, D. nigromaculata and P. pallida for grasses. Differential attraction to different kinds of fungi and grasses was indicated by the drosophilid species. Most of the species collected by sweeping except a few species have been scarcely attracted to fermenting fruits such as banana bait. It is evident that D. nigromaculata which was one of the “abundant” species among the trapped sample, has had the most universal preference for various kinds of food in all species obtained from the Gardens in the present survey.
