Abai, MR

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6th International Congress of DipterologyTachinid fauna of Fiji IslandsShima, H.Biosystematics Laboratory, Graduate School of Social and Cultural Studies, KyushuUniversity, Fukuoka, JapanThe Fijian Bioinventory Arthoropoda Project yielded (and is still yielding)more than 3,500 tachinid specimens collected by malaise traps in Fiji. Iam systematically studying this collection together with Fiji tachinidcollections in Bishop Museum, Honolulu, and Kyushu University,Fukuoka. Fijian tachinids have been known from 30 species including 7introduced species for biocontrol purpose (excluding 4 uncertanmisidentified species) (Cantrel & Crosskey, 1983; Shima, 1998). Ten ofthem, including 4 introduced species, were not found in the presentcollections, but 45 species were newly added, now totally 75 species ofTachinidae being known from Fiji: more than 20 species are undescribedand 2 (or 3) are unassignable to any known genera. Some of these speciesapparently have their relationships with Australia or New Guinea, such asParopsivora sp. (Exoristinae, Blondeliini), Anagonia sp. (Blondeliini),Voriella sp. (Tachininae, Neaerini), Donovanius transfuga (Dexiinae,Rutilliini), Rasiliverpa vicinella (Dexiinae, Dexiini) and Leverella sp.(Phasiinae, Parerigonini), but many others appear to belong to genera ofmainly known from the Oriental Region. Among this rather small numberof Fiji tachinids, Leskiini appear to be diverse and include about tenendemic species of two or three genera, Cavillatrix and unknown ones.Siphonini comprise 3 genera of 7 species, 3 of them appearing endemic.Pales (Goniini) is characteristic, comprising 7 endemic species, bezziana,poecilochaeta and 5 undescribed ones. Pales is known from some tenspecies in New Zealand and the phylogenetic relationships of these speciesare very interesting. It is also interesting that eryciine Palexorista, mostspecies of which are widely distributed over the tropical and subtropicalAsia and Oceania, comprises 3 species including 2 endemic andundescribed.Key Words: Fiji Islands, Tachinid fauna, geographical distribution230
6th International Congress of DipterologyInvasion of solanum fruit fly, Bactrocera latifrons (Diptera:Tephritidae) on Yonaguni Island, OkinawaShimizu Y. (1), T. Kohama (2), T. Uesato (1), T. Matsuyama (2) & M. Yamagishi (1)(1) Okinawa Prefectural Plant Protection Center, Maji, Naha 902-0072, Japan(2) Okinawa Prefectural Agricultural Research Center, Makabe, Itoman 901-0336, JapanThe solanum fruit fly Bactrocera latifrons was first discovered in cherrytomato plants on Yonaguni Island in 1984, during oriental fruit flyBactrocera dorsalis eradication. This is the first record of this species inJapan. In successive host fruit surveys between 1985 and 1986, a largenumber of B. latifrons emerged from some host fruits. However, in thefollowing 12 years (1987 to 1998), B. latifrons was not detected onYonaguni Island in periodic surveys of host fruits. In 1999, B. latifronswas again found in bell peppers and egg plants on the Island, andsubsequent surveys to 2004 revealed that B. latifrons was detected in largenumbers year to year and was distributed all over the Island. We concludedthat B. latifrons has already been established on Yonaguni Island. Thisreport will summarize host fruit surveys from October 1999 to July 2004because in this period we intensively collected solanaceous fruits of themain hosts and detected B. latifrons. Fruits infested by B. latifrons wereegg plants, tomatoes, cherry tomatoes, bell peppers, red peppers, Solanumamericanum Mill. in solanaceous plants, and Diplocyclos palmatus incucurbitaceous plants. B. latifrons appeared from spring to autumn and wasmost frequent in summer. In winter, B. latifrons almost disappeared. B.latifrons has not been detected on the other islands of Okinawa Prefectureso far, though we collected numerous fruits of the hosts. At present, thedistribution of B. latifrons is restricted to Yonaguni Island. We will discussthe possibility of invasion into the other areas including mainland of Japan.Controlling B. larifrons on Yonaguni Island by the sterile insect techniquewill then be considered.Key Words: Bactrocera latifrons, invasion, host fruit, seasonal occurrence,Yonaguni island231
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Abai, MR

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