Complaints by millipedes (Diplopoda) in Toyama Prefecture from 1973 to 2013 were reported based on the evidence of identification service and consultation by the Toyama Institute of Health. The total number of complaints due to millipedes was 51. The complaints were basically due to nuisance, including 11 cases of indoor invasion. Peaks in complaints caused by millipedes were observed in May–July and October–November. Complaints by millipedes in Toyama Prefecture were attributed to the following three species: Japanioiulus lobatus (Julida: Julidae), Oxidus gracilis (Polydesmida: Paradoxosomatidae), and Parafontaria falcifera (Polydesmida: Xystodesmidae). The outbreak of P. falcifera was firstly recorded.

We monitored vector mosquitoes and arboviruses to clarify the vector mosquito population dynamics and the prevalence of viral possession. We collected 760 mosquitoes at five locations in Ishikawa Prefecture, Japan, in 2019. Aedes albopictus (Skuse) (Diptera: Culicidae) accounted for 73.3% of all mosquitoes collected, representing a high proportion for July to September. Moreover, the number and proportion of Ae. albopictus collected varied depending on location. RNA extracted from female Ae. albopictus was tested for Dengue, Chikungunya, and Zika viruses using RT-PCR assays. No viral genes were detected. We discuss the need to continue the monitoring of mosquito occurrences.

Seventeen individuals blood-fed mosquitoes including 7 species were collected in the Kansai area and the Ryukyu Archipelago, Japan, from 2009 to 2012. The sources of the blood meals were identified by PCR sequencing. The results showed that Aedes bekkui fed on human Homo sapiens, raccoon dog Nyctereutes procyonoides, and wild boar Sus scrofa. Aedes flavopictus miyarai fed on tortoise Cuora flavomarginata evelynae. Verrallina nobukonis fed on human and tortoise. Culex vagans fed on bird, dark-throated thrush Turdus ruficollis; Cx. infantulus fed on cattle; Cx. nigropunctatus fed on bird, night heron Nycticorax nycticorax; and Cx. okinawae fed on otton frog Babina subaspera. Aedes f. miyarai and Cx. infantulus were the first record to feed on cold-blooded animals and warm-blooded animals, respectively.

We received a special permit to collect dipterous insects, such as mosquitoes, horse flies, and biting midges, in Ozegahara, which is a protected area in Oze National Park and the largest wetland in Honshu, Japan. Herein, we report on the mosquito larvae survey conducted on August 6 and 7, 2023. A total of 28 mosquito larvae and a pupa were collected, comprising 3 species of mosquito, namely Culex rubensis, Aedes esoensis, and Ae. japonicus. This is the first report of Cx. rubensis collected from the Ozegahara wetland.

Tabanus rufidens and Tabanus yakuensis (Diptera: Tabanidae) are newly recorded from Kuchinoerabu-jima Island, Osumi Islands, Kagoshima Prefecture, Japan.

Mosquito collections were carried out using dry-ice traps at Nagura Amparu, Ishigaki Island, Japan, in June and August 2011 and March and September 2012. Dry-ice traps were placed at four collection sites with different surrounding environments in Nagura Amparu, such as a riverside, rice fields, a tree row and bushes, and one place in a residential area in Ishigaki City for comparison. A total of 6,558 females of 22 species in 8 genera were collected at Nagura Amparu. The dominant species were Culex tritaeniorhynchus, Cx. vishnui, Cx. sitiens, and Cx. pseudovishnui, comprising 77% of the total. In the residential area, a total of 875 females of 6 species in 4 genera were collected. Aedes albopictus and Cx. quinquefasciatus comprised 94% of the total.

We confirmed that Tanbara Wetland is a new collecting place for Hybomitra tarandina (Linné, 1758), which is situated in Numata, Gunma Prefecture on Honshu Island, Japan. It is the second record for H. tarandina on Honshu Island. By referring to records hitherto known in Japan, it revealed some ecological features to this species. Despite this fly distributing widely throughout the northern parts of the Eurasia continent, individuals had yet to be collected in Japan except for Hokkaido and Oze, Gunma.