(Hylaeus assimulans)
Hylaeus assimulans is a species of bee, also known by the common name Assimulans yellow-faced bee. It is endemic to Hawaii and known from only five populations. In September 2016, along with six other Hawaiian Hylaeus species, H. assimulans was listed for protection under the United States Endangered Species Act. This marked a first listing for any bee species in the US.