MEMO - Monitoring of Exotic MOsquitoes in Belgium is a sampling event dataset published by the Institute of Tropical Medicine in Antwerp (Belgium) (ITM). It is part of the early detection of exotic mosquito species (EMS) along high-risk introduction routes in Belgium, in which data are collected at defined locations (i.e. Points of Entry or PoE’s) using a standardised protocol. The MEMO dataset contains mosquito sampling counts performed between 2017 and 2020, and the MEMO+2020, an extension of the MEMO dataset, contains only Aedes albopictus mosquito trap counts performed in 2020. Here, they are published as a standardised Darwin Core Archive, which includes for each sampling event an eventID, a date, a location and a sampling protocol (in the event core); and an occurrenceID for each occurrence (tube), the number of collected individuals per tube, species status (present/absent), information on the identification and scientific name (in the occurrence extension). Issues with the dataset can be reported at https://github.com/BelgianBiodiversityPlatform/data-publication-ITG/issues Here, it is published as a standardized Darwin Core Archive and includes for each sampling event an eventID, date, location and sampling protocol (in the event core), and for each occurrence an occurrenceID, the number of recorded individuals, status (present/absent), identification and scientific name (in the occurrence extension). Issues with the dataset can be reported at https://github.com/BelgianBiodiversityPlatform/data-publication-ITG/issues We have released this dataset to the public domain under a https://creativecommons.org/publicdomain/zero/1.0/. waiver. We would appreciate it if you follow the INBO norms for data use (https://www.inbo.be/en/norms-data-use) when using the data. If you have any questions regarding this dataset, don't hesitate to contact us via the contact information provided in the metadata.