Heptagenia bella (Alien & Cohen) is placed herein as Nixe bella, NEW C
OMBINATION. Serratella thailandensis Alien NEW SYNONYM is a junior obj
ective synonym of Cincticostella gosei (Alien). The species Ephemerell
a (Dentatella) bartoni (Alien) is properly referred to as Eurylophella
(Dentatella) bartoni Alien. Caurinella idahoensis Allen is confirmed
to be a valid genus and species of uncertain affinities. The genus Vie
tnamella Tshernova is transferred from Ephemerellinae to Teloganodinae
.