Living with many others in bowl of pitcher plant (Sarracenia purpurea).
Compare to this species in Darsie & Ward: https://mosquito-taxonomic-inventory.myspecies.info/sites/mosquito-taxonomic-inventory.info/files/Darsie%20%26%20Ward%201981.pdf (see especially p. 128 and 219, abbreviations list on p.123). Two anal papillae (APP), whose number, size and shape are different than other species. If the siphon has setae as in the key, they are not visible here.