Abstract / Introduction / Summary:
A field survey of ants (Formicidae) was conducted at the Unagi district of Ibusuki-shi, southern Kyushu. Eighteen species of 11 genera in 4 subfamilies were collected. This figure corresponds to around 60% of the 31 species so far collected in the downtown of Ibusuki-shi. Of the 18 species, 8 (44.4%) were alien species. Paratrechina longicornis was only sampled at steam spout holes of the hot spring in 2020. Thereafter, this ant was seen spreading over the whole area of the Unagi district in 2022. This ant would extend its range outside the Unagi district in near future.