Aruba is a new country record for Hemisphaerota cyanea (Say, 1824) (Coleoptera: Chrysomelidae: Cassidinae: Hemisphaerotini).
This paper reports the first record of Hemisphaerota cyanea feeding on ornamental palms planted near a resort in Aruba. Larvae of different instars and adults were abundant, as was feeding damage, suggesting an established population. While historically restricted to the southern United States, H. cyanea has now been recorded 1800 km outside of its known range. This range extension could be due to international importation of ornamental palms. This is supported by the observed population being found in a high-volume tourist area with many non-native plants in the local landscaping. This scenario suggests a potential pest risk for large ornamental plantings in other Caribbean vacation destinations. Frequent insecticidal spraying within resorts may not be effective on the shield-armored larvae and pupae and could raise health concerns for visitors.