A New Record of Aedes thibaulti In Massachusetts

For the 1st time, collections of adult female Aedes thibaulti are reported from Massachusetts. Initial collections occurred in 2016 and again in 2017 and 2018. This mosquito was found at 35 locations within 28 municipalities, including the city of Boston. Most of the Ae. thibaulti were collected with the Centers for Disease Control and Prevention miniature light traps baited with CO₂. Collections were made from epidemiological (EPI) wk 22 to 35 with a peak at EPI wk 24. Although larvae have not yet been collected, the most common wetland types adjacent to collection sites were forested wetlands, which is consistent with the known larval habitat of this mosquito species. Aedes thibaulti is likely established in the state of Massachusetts.