Neotropical beach-fly species (Diptera: Tethinidae) not included in a previ
ous faunal revision of the Caribbean, Gulf of Mexico, and Bermuda are revie
wed, including description of the following new species (type locality in p
arenthesis): Tethina robusta (Chile. Osorno: Puchatrihue). Two new synonyms
are also proposed (Junior synonyms cited first): Rhicnoessa sonorensis Mel
ander = Tethina albula Loew and Tethina setulosa Malloch = Tethina spinulos
a Cole. A revised key to the Neotropical species of Tethina and a diagnosis
for the senior synonyms are provided.